Database Star: Home

Compare PostgreSQL Databases in Seconds

Mon, 15 Sep 2025 00:00:00 +0000

Learn how to use this tool to automatically compare PostgreSQL databases.

How MySQL AI in 2025 Ends Your Struggle with Late-Night SQL

Wed, 09 Jul 2025 00:00:00 +0000

A guide to the new dbForge AI Assistant.

Moved Away from WordPress

Sun, 15 Jun 2025 00:00:00 +0000

I recently migrated this site away from WordPress. I'll explain why in this article.

dbForge SQL Complete 7.0 Just Released

Tue, 28 Jan 2025 00:00:00 +0000

If you work with SQL Server, then you'll be interested in this. dbForge SQL Complete, an add-in for SSMS and Visual Studio, has just been released with a new version and some great new features.

I Surveyed 483 SQL Users About Their Tools

Wed, 14 Aug 2024 00:00:00 +0000

I surveyed 483 database users about which databases and editors they use.

How to Delete a Row in SQL

Wed, 16 Aug 2023 00:00:00 +0000

In this post, you’ll learn how to delete a row in SQL and how to delete all rows in a table.

How to Count Distinct Values in SQL

Tue, 15 Aug 2023 00:00:00 +0000

In this article, you’ll learn how to count the number of unique values in a column.

How to Install Postgres on Mac Using Homebrew

Tue, 15 Aug 2023 00:00:00 +0000

In this article, you’ll see step-by-step instructions on how to install PostgreSQL using Homebrew.

Solution for Homebrew PostgreSQL Service Not Starting

Mon, 14 Aug 2023 00:00:00 +0000

If you’re on a Mac and trying to run Postgres using Homebrew, you might have problems starting the service. In this post, I’ll explain the issue and the solution.

How to Install MySQL on Windows

Wed, 09 Aug 2023 00:00:00 +0000

In this post, you’ll learn how to install a MySQL database on Windows and connect to it using MySQL Workbench.

How to Install Postgres on Windows

Fri, 28 Jul 2023 00:00:00 +0000

In this guide, you'll learn how to download PostgreSQL for Windows, install it, and use pgAdmin to connect to the database.

How to Set Up the Oracle Cloud Free Tier

Fri, 28 Jul 2023 00:00:00 +0000

In this guide, you'll learn how to set up an Oracle database on their Free Cloud Tier.

How to Install SQL Server Express (& SSMS)

Thu, 13 Jul 2023 00:00:00 +0000

In this post, you’ll see the step-by-step process to download and install SQL Server Express, install SQL Server Management Studio, and connect to the database.

How to Install MySQL on Mac using a DMG File

Mon, 10 Jul 2023 00:00:00 +0000

In this article, you'll learn how to install MySQL on a Mac using an installation package, otherwise known as a DMG file.

How to Install MySQL on Mac using Homebrew

Mon, 10 Jul 2023 00:00:00 +0000

In this article, you'll see step-by-step instructions on how to install MySQL using Homebrew.

Aqua Data Studio vs DBeaver: A Comparison

Mon, 24 Apr 2023 00:00:00 +0000

In this post, I'll compare the major features of both Aqua Data Studio and DBeaver.

How to Create a Simple ERD in SSMS

Sat, 01 Apr 2023 00:00:00 +0000

Learn how to create an ERD in SSMS.

How to Create a Simple ERD in MySQL Workbench

Fri, 31 Mar 2023 00:00:00 +0000

Learn how to create an ERD in MySQL Workbench.

How to Create a Simple ERD in pgAdmin

Fri, 31 Mar 2023 00:00:00 +0000

Learn how to create an ERD in pgAdmin.

How to Create a Simple ERD in SQL Developer Data Modeler

Fri, 31 Mar 2023 00:00:00 +0000

Learn how to generate an ERD in SQL Developer.

How to Format a Date in PostgreSQL

Thu, 13 Oct 2022 00:00:00 +0000

In this guide, you'll learn how to format DATE values into many different formats, how to insert DATE values into a table, and more.

On Delete Cascade in SQL

Tue, 11 Oct 2022 00:00:00 +0000

In this article, you'll learn what the ON DELETE CASCADE keyword means and what it does.

Oracle Live SQL: The Complete Guide

Mon, 10 Oct 2022 00:00:00 +0000

In this guide, you'll learn all about Oracle Live SQL

SQL Decimal: Guide and Examples

Thu, 06 Oct 2022 00:00:00 +0000

The SQL DECIMAL data type is useful for storing numbers with decimal places. Learn all about it, including which databases support it, and how to work with it, in this guide.

How to Use Multiple Inner Joins in SQL

Tue, 04 Oct 2022 00:00:00 +0000

In this guide, you'll learn how to use multiple inner joins in SQL, why you may want to do this, and see some examples.

How to Create a Database in MySQL

Mon, 03 Oct 2022 00:00:00 +0000

If you want to create a new database in MySQL, you can either use an SQL command or follow the steps in an IDE such as MySQL Workbench.

Learn how to do it in both ways in this guide.

MySQL Create Database Command

To create a new database in MySQL, you can use the CREATE DATABASE command.

The simple version looks like this:

1CREATE DATABASE database_name;

The full command has a lot more options you can set:

How to Split a String in SQL: Guide & Examples

Mon, 03 Oct 2022 00:00:00 +0000

To split a string in SQL you can use a built-in function. The exact function depends on which database you're using.

How to Install Postgres on Mac

Sat, 01 Oct 2022 00:00:00 +0000

If you want to install a PostgreSQL database on macOS, you can follow the steps in this guide.

SQL IN and SQL NOT IN - Guide & Examples

Fri, 30 Sep 2022 00:00:00 +0000

The SQL IN and SQL NOT IN keywords allow you to compare against a list of values, instead of a single value. Learn all about how to use them and see some examples in this guide.

SQL Cheat Sheet

Wed, 28 Sep 2022 00:00:00 +0000

Get a reference for many of the common SQL commands and features on this SQL Cheat Sheet page.

OTN Appreciation Day

Tue, 27 Sep 2022 00:00:00 +0000

As part of the ThanksOTN (or ThanksODC) idea started by Tim Hall on Twitter, I've written about a few things I appreciate over the years.

MySQL Privileges The Ultimate Guide

Wed, 22 Dec 2021 00:00:00 +0000

Learn what MySQL privileges are and how they work.

How to Handle Database Timezones

Sun, 12 Dec 2021 00:00:00 +0000

Learn what timezones are and how to work with them in a database.

A Guide to Oracle PDB (Pluggable Database) and CDB (Container Database)

Sun, 28 Nov 2021 00:00:00 +0000

Learn all about pluggable databases (PDB) in Oracle.

MySQL ENUM: The Ultimate Guide

Thu, 14 Oct 2021 00:00:00 +0000

Learn all about ENUMs in MySQL.

How to Change User Password in MySQL

Wed, 13 Oct 2021 00:00:00 +0000

Learn how to change the password in MySQL.

Use mysqldump to Backup and Restore a MySQL Database

Thu, 07 Oct 2021 00:00:00 +0000

Learn all about the mysqldump command.

MySQL Pivot: How To Generate a Pivot Table

Mon, 04 Oct 2021 00:00:00 +0000

Learn how to pivot in MySQL.

SQL Server PIVOT and UNPIVOT Explained with Examples

Wed, 29 Sep 2021 00:00:00 +0000

Learn how to pivot data in SQL Server

Flyway DB Tutorial: How to Set Up Flyway

Fri, 24 Sep 2021 00:00:00 +0000

Learn how to set up and use Flyway DB.

GitHub Tutorial for SQL Files

Tue, 21 Sep 2021 00:00:00 +0000

Learn how to use GitHub.

How to Perform Bulk Insert in Oracle PL/SQL

Mon, 20 Sep 2021 00:00:00 +0000

Learn how to use the Bulk Insert feature in Oracle.

MySQL Workbench Export and Import Database: How To

Wed, 15 Sep 2021 00:00:00 +0000

Learn how to export a database in MySQL Workbench.

SQL Developer Import CSV: How To

Wed, 15 Sep 2021 00:00:00 +0000

Learn how to import a CSV file in SQL Developer

SQL Describe Table (In Different Vendors)

Mon, 13 Sep 2021 00:00:00 +0000

Learn how to describe a table in SQL.

How to Generate a Running Total in SQL

Sat, 11 Sep 2021 00:00:00 +0000

Learn how to calculate a running total in SQL.

How to Remove Duplicate Records in SQL

Fri, 10 Sep 2021 00:00:00 +0000

Learn how to remove duplicate rows from a table using SQL.

How to Create a User in Oracle (With Privileges)

Thu, 09 Sep 2021 00:00:00 +0000

Learn how to create a user on the Oracle database.

How to Set Up a Database on Docker

Sun, 05 Sep 2021 00:00:00 +0000

Learn how to set up and use Docker for a database.

Complex SQL Query Example - Daily Order Analysis

Wed, 14 Jul 2021 00:00:00 +0000

If you want to see how to write a complex query on an SQL database, this example will show you.

How to Set Up the Sample Bookstore Database

Tue, 29 Jun 2021 00:00:00 +0000

Details on the sample bookstore database

116 Software Development Tools

Tue, 22 Jun 2021 00:00:00 +0000

See a list of software development tools.

SQL Default Value: How To with Examples

Sun, 13 Jun 2021 00:00:00 +0000

Learn all about the SQL DEFAULT constraint.

How to Fix MySQL Error: Access Denied for User 'root'@'localhost'

Wed, 09 Jun 2021 00:00:00 +0000

Learn how to fix this access denied error, and see a range of solutions if the suggested fix does not work, in this article.

SQL Cross Apply and Outer Apply: The Complete Guide

Tue, 09 Mar 2021 00:00:00 +0000

Learn all about the CROSS APPLY feature in SQL.

How to Show a List of Databases in SQL

Mon, 08 Mar 2021 00:00:00 +0000

Learn how to show a list of databases in SQL

SQL Drop Database Command

Sun, 07 Mar 2021 00:00:00 +0000

Sometimes you'll need to delete a database or drop a database in SQL. There's a command to do this in SQL. Let's see how you can do this in different databases.

How to Update from Select in SQL

Thu, 04 Mar 2021 00:00:00 +0000

Let's take a look at the SQL Update from Select techniques in this guide.

JSON in PostgreSQL: The Ultimate Guide

Thu, 04 Mar 2021 00:00:00 +0000

Learn all about JSON in PostgreSQL.

SQL Show Tables: List All Tables in a Database

Thu, 04 Mar 2021 00:00:00 +0000

Learn how to get a list of tables in an SQL database.

A Guide to DBMS_OUTPUT.PUT_LINE

Wed, 03 Mar 2021 00:00:00 +0000

In this guide, you'll learn what the DBMS_OUTPUT.PUT_LINE function in Oracle does.

A Guide to SQL Bind Variables

Wed, 03 Mar 2021 00:00:00 +0000

Learn all about bind variables in SQL.

JSON in Oracle: The Ultimate Guide

Tue, 02 Mar 2021 00:00:00 +0000

Learn all about JSON in an Oracle database.

800 Free Data Sets

Sun, 28 Feb 2021 00:00:00 +0000

A list of free data sets to help practice SQL.

JSON in SQL Server: The Ultimate Guide

Wed, 24 Feb 2021 00:00:00 +0000

Learn all about JSON in SQL Server.

SQL Injection: The Definitive Guide

Tue, 23 Feb 2021 00:00:00 +0000

Learn all about SQL injection in this guide.

SQL Indexes - The Definitive Guide

Wed, 17 Feb 2021 00:00:00 +0000

Learn all about SQL indexes in this guide.

SQL MIN Function with Examples

Thu, 21 Jan 2021 00:00:00 +0000

The SQL MIN function is used to find the lowest or minimum value. Learn how to use it and see some examples in this article.

SQL Constraints: The Complete Guide

Sun, 17 Jan 2021 00:00:00 +0000

SQL constraints are a feature that allow you to create rules that improve the quality of your data. Learn all about them in this guide.

SQL Aggregate Functions: A Guide

Tue, 12 Jan 2021 00:00:00 +0000

Learn all about SQL aggregate functions and what they do in this article.

SQL AVG Function with Examples

Tue, 12 Jan 2021 00:00:00 +0000

The SQL AVG function allows you to find the average value from the specified values. Learn how to use it and see some examples in this article.

The Complete Guide to Asynchronous Communication for Improving and Replacing Meetings

Mon, 11 Jan 2021 00:00:00 +0000

Learn all about asynchronous communication in this guide.

SQL MAX Function Explained with Examples

Sun, 10 Jan 2021 00:00:00 +0000

Learn how to use the SQL MAX function.

SQL SUM Function Explained with Examples

Thu, 07 Jan 2021 00:00:00 +0000

The SQL SUM function can be used to add numbers together. Learn how to use it and see some examples in this article.

How to Install Oracle Express on Your PC

Sat, 02 Jan 2021 00:00:00 +0000

In this post, I'll explain how to download, install, and set up an Oracle Express Database on your own computer.

JSON in MySQL: The Ultimate Guide

Tue, 27 Oct 2020 00:00:00 +0000

Read this complete guide to JSON in MySQL.

SQL Best Practices and Style Guide

Mon, 19 Oct 2020 00:00:00 +0000

Read on to learn how to style your SQL and some recommendations in this "SQL Style Guide and Best Practices".

Ultimate Guide to the SQL Execution Plan

Thu, 15 Oct 2020 00:00:00 +0000

Learn all about SQL execution plans.

How to Fix Slow SQL Queries

Mon, 12 Oct 2020 00:00:00 +0000

In this article, you'll learn a range of reasons why a SQL query may be slow and how to fix them.

Hierarchical Data in SQL: The Ultimate Guide

Sun, 04 Oct 2020 00:00:00 +0000

Learn what hierarchical data is in SQL and how to handle it.

29 Software Developers Share Database Advice

Tue, 29 Sep 2020 00:00:00 +0000

Recently, I asked a range of software developer blog owners to share their advice for working with databases.

How to Save MySQL Query Output to a File

Tue, 29 Sep 2020 00:00:00 +0000

Learn how to save the results of a query to a file in MySQL.

How to Import a CSV using MySQL Workbench

Thu, 17 Sep 2020 00:00:00 +0000

Learn how to import a CSV file in MySQL Workbench.

17 Sites for SQL Practice

Tue, 15 Sep 2020 00:00:00 +0000

This list contains many different websites that have SQL practice functionality.

81 Best Books for Programmers

Tue, 15 Sep 2020 00:00:00 +0000

This page contains a list of the best books for programmers.

Dynamic SQL: A Guide for SQL Server, Oracle, MySQL, and PostgreSQL

Sun, 13 Sep 2020 00:00:00 +0000

Dynamic SQL is a handy feature of a database that lets you construct SQL statements in a different way.

SQL Server ROW_NUMBER SQL Function

Sun, 13 Sep 2020 00:00:00 +0000

In this guide, you'll learn all about the ROW\_NUMBER function in SQL Server.

MySQL Drop All Tables: How-To With Examples

Sun, 30 Aug 2020 00:00:00 +0000

In this article, you'll learn how to do that easily, both using an SQL command an inside an IDE such as MySQL Workbench.

How to Reset IDENTITY Column Values in SQL Server

Sat, 29 Aug 2020 00:00:00 +0000

Learn how to reset an identity column in SQL Server.

SQL Rename Table: How To with Examples

Sat, 29 Aug 2020 00:00:00 +0000

Learn how to rename a table in SQL.

MySQL Create User and Grant Permissions: How To

Wed, 26 Aug 2020 00:00:00 +0000

Learn how to create a user in MySQL.

MySQL Date Data Types and Date Functions

Thu, 13 Aug 2020 00:00:00 +0000

In this guide, we'll look at the MySQL date data types, the date functions, and see some examples of them.

SQL Add Column: A How-To Guide with Examples

Tue, 11 Aug 2020 00:00:00 +0000

Let's take a look at how to add a column in several different databases and see some examples.

52 SQL Editors and IDEs Compared (2020): The Ultimate List

Sun, 26 Jul 2020 00:00:00 +0000

Are you looking for an SQL IDE (Integrated Development Environment) or SQL editor? Take a look at this list of all of the IDEs currently available.

SQL Window Functions: The Ultimate Guide

Mon, 20 Jul 2020 00:00:00 +0000

Learn all about SQL window functions in this guide.

MySQL Show Users: A How-To Guide with Examples

Wed, 15 Jul 2020 00:00:00 +0000

In this guide, you'll learn how to see a list of users. You'll also be able to see a list of logged-in users as well as the current user.

SQL Commands: A List with SQL Syntax

Wed, 15 Jul 2020 00:00:00 +0000

Let's take a look at the SQL commands and the SQL syntax for them.

SQL Get Current Date

Wed, 15 Jul 2020 00:00:00 +0000

Learn how to get the current date in SQL.

SQL Create Database: A How-To Guide

Tue, 14 Jul 2020 00:00:00 +0000

Learn how to create a database in SQL.

SQL Auto Increment: How to Use It in Different Databases

Thu, 09 Jul 2020 00:00:00 +0000

Learn how to set this up in SQL Server, MySQL, PostgreSQL, and Oracle in this article.

How to Insert Multiple Rows in SQL

Wed, 08 Jul 2020 00:00:00 +0000

Learn how ot insert multiple rows in this guide.

A Beginner's Guide to an SQL Cursor (In Many Databases)

Mon, 06 Jul 2020 00:00:00 +0000

Learn what SQL cursors are and how to use them.

SQL INT Data Types in Different Databases

Sat, 04 Jul 2020 00:00:00 +0000

In this guide, you'll see all of these INT data types, see their restrictions, and how they compare between databases.

SQL Server CHARINDEX Function Guide with Examples

Sat, 04 Jul 2020 00:00:00 +0000

Learn how to use the CHARINDEX function.

How to Convert DATETIME to DATE in SQL Server

Thu, 02 Jul 2020 00:00:00 +0000

Learn how to convert a DATETIME to DATE in SQL Server.

How to Resolve Column count doesn't match value count at row 1

Thu, 02 Jul 2020 00:00:00 +0000

Learn how to resolve this "Column count doesn't match value count" error

How to Fix The "Every derived table must have its own alias" Error in MySQL

Sun, 28 Jun 2020 00:00:00 +0000

Learn how to resolve this error.

How to Start MySQL Server on Mac, Windows, and Linux

Sun, 28 Jun 2020 00:00:00 +0000

Do you want to know how to start, stop, and restart the MySQL server? Learn how you can do that on each operating system in this article.

SQL vs MySQL vs SQL Server: What's the Difference?

Sat, 27 Jun 2020 00:00:00 +0000

Learn the difference between SQL and MySQL.

How to Install Oracle on a Mac (2020)

Sun, 10 May 2020 00:00:00 +0000

In this post, you're going to learn the exact steps to take to install Oracle on your Mac computer.

SQL CAST Function Explained with Examples

Thu, 30 Apr 2020 00:00:00 +0000

The SQL CAST function is quite powerful, but it can be hard to use. Learn how to use it and what it can do in this article.

The Ultimate Guide to Database Version Control, CI/CD, and Deployment

Sat, 01 Feb 2020 00:00:00 +0000

In this guide, I'll explain that there's a better way to handle changes to your database and how to get it under version control, tested, and deployed along with application code.

70 Software Development Companies Share Advice for Client and Project Success

Tue, 28 Jan 2020 00:00:00 +0000

Companies that develop custom software for other companies have a lot of experience working with their clients. In this article, I've asked a range of them to provide their advice for working with clients.

SQL DATEDIFF Function Guide and Examples

Tue, 14 Jan 2020 00:00:00 +0000

The SQL Server DATEDIFF function lets you find the difference between two dates in a range of different units. Learn how to use it and see a range of examples in this guide.

SQL Data Types: Oracle, SQL Server, MySQL, PostgreSQL

Sat, 11 Jan 2020 00:00:00 +0000

Do you want to know what the SQL data types are in different database vendors? Learn all about them and how they compare in this guide.

SQL Server CONVERT Function Guide

Fri, 10 Jan 2020 00:00:00 +0000

Do you need to convert data in SQL Server? Looking for the format codes for the CONVERT function? Learn all about the SQL Server CONVERT function in this guide.

SQL Comments: A How-To Guide

Thu, 09 Jan 2020 00:00:00 +0000

Many programming languages allow you to comment out code so that it does not run. SQL allows comments as well. Learn how to add SQL comments in this article.

42 ETL Tools: The Definitive List

Wed, 08 Jan 2020 00:00:00 +0000

This list has all of the currently available ETL tools. Use this for your research to help you decide which tool to use.

PostgreSQL vs MySQL: An Analysis

Tue, 07 Jan 2020 00:00:00 +0000

Are you considering using either MySQL or PostgreSQL for your next project? Read this article to find out the differences between these two databases and help decide which one to use.

SQL ALTER TABLE: A Complete Guide

Tue, 07 Jan 2020 00:00:00 +0000

Learn all about the SQL Alter Table statement.

Ultimate Guide to Data Warehouses

Mon, 06 Jan 2020 00:00:00 +0000

Learn all about data warehouses in this guide.

SQL COUNT Function Explained with Examples

Sun, 05 Jan 2020 00:00:00 +0000

The SQL COUNT function is one of the most common functions used by SQL developers. I use it on a daily basis. Learn more about the COUNT function in this article.

SQL DROP TABLE: The Complete Guide

Sun, 05 Jan 2020 00:00:00 +0000

Learn how to drop tables in SQL.

SQL CASE Statement Explained with Examples

Sat, 04 Jan 2020 00:00:00 +0000

The SQL CASE statement allows you to perform IF-THEN-ELSE functionality within an SQL statement. Learn more about this powerful statement in this article.

SQL INSERT: The Complete Guide

Sat, 04 Jan 2020 00:00:00 +0000

Learn how to use the SQL INSERT INTO command.

SQL DELETE Statement - The Complete Guide

Fri, 03 Jan 2020 00:00:00 +0000

The SQL DELETE statement allows you to delete records from a table. I'll explain more about the SQL DELETE statement in this article.

SQL TRUNCATE TABLE Statement: The Complete Guide

Fri, 03 Jan 2020 00:00:00 +0000

Learn all about the SQL TRUNCATE keyword.

SQL UPDATE Statement: A Complete Guide

Thu, 02 Jan 2020 00:00:00 +0000

Have you ever needed to update data that was already in a table? Learn how to do this with the SQL UPDATE Statement.

SQL CREATE TABLE Syntax and Examples - The Complete Guide

Wed, 01 Jan 2020 00:00:00 +0000

Creating database tables in SQL is one of the most common tasks a developer or DBA does in a database. Learn how to create tables, what the syntax is, and see some examples in this article.

SQL GROUP BY and HAVING: The Complete Guide

Wed, 01 Jan 2020 00:00:00 +0000

The SQL GROUP BY clause and SQL HAVING clause are powerful clauses, especially when analysing large amounts of data. Learn what the GROUP BY and HAVING clause is and everything you can do with it in this article.

Why Use PostgreSQL?

Mon, 30 Dec 2019 00:00:00 +0000

Some reasons why you should use PostgreSQL.

A Guide to SQL NULL (and SQL NOT NULL)

Mon, 23 Dec 2019 00:00:00 +0000

In this article, you'll learn all about NULL, what it is, why it's different, how you can check for it in different databases, and many examples.

Sample Database: University Rankings (ERD and SQL)

Tue, 17 Dec 2019 00:00:00 +0000

Details on the sample university database

Sample Database: Superheroes (ERD and SQL)

Sun, 15 Dec 2019 00:00:00 +0000

Details on hte sample superheroes database.

19 Best Database Books

Thu, 12 Dec 2019 00:00:00 +0000

A list of the best database books.

Sample Database: Olympic Games (ERD and SQL)

Mon, 09 Dec 2019 00:00:00 +0000

Details of the sample Olympics database.

Sample Database: Video Games (ERD and SQL)

Mon, 02 Dec 2019 00:00:00 +0000

Details of the sample video games database.

How to Resolve Oracle Connection Issues

Fri, 15 Nov 2019 00:00:00 +0000

Learn some tips for resolving Oracle connection issues.

Sample Database: Movies (ERD and SQL)

Sun, 03 Nov 2019 00:00:00 +0000

Details of the sammple movies database.

SQL Boolean Data Type

Tue, 06 Aug 2019 00:00:00 +0000

Do you need to store a boolean value in your SQL database? Does the data type even exist? Read this article and find out.

SQL Temp Tables: The Ultimate Guide

Mon, 05 Aug 2019 00:00:00 +0000

Have you ever heard of an SQL temp table or a temporary table? Wondering what it is? Learn all about them in this guide.

SQL Select Statement

Sun, 04 Aug 2019 00:00:00 +0000

In this article, we'll look at one of the statements you'll use a lot in SQL, the SELECT statement.

A Guide to the Entity Relationship Diagram (ERD)

Tue, 30 Jul 2019 00:00:00 +0000

Learn all about Entity Relationship Diagrams (ERDs), what they are used for, how to understand them, how to create them, and more in this guide.

SQL Concatenate: A How-To Guide with Examples

Wed, 24 Jul 2019 00:00:00 +0000

String concatenation is the process of joining two string values together. Let's see how to do it in several different databases.

SQL Wildcards

Mon, 22 Jul 2019 00:00:00 +0000

Wildcards are a useful technique when working with strings in SQL. Learn all about them and see some examples in this article.

SQL Transactions and Isolation Levels: The Ultimate Guide

Thu, 18 Jul 2019 00:00:00 +0000

Transactions are an important part of SQL and the databases they run on. Learn all about SQL transactions in this guide.

What is a Database Schema?

Sun, 14 Jul 2019 00:00:00 +0000

The term "database schema" has a few different meanings. Let's look further into these definitions.

Oracle 1Z0-071 Exam Guide and FAQ (OCA Certification)

Tue, 28 May 2019 00:00:00 +0000

Learn all about the 1Z0-071 exam.

SQL Alias: A Guide to the SQL Aliases and the SQL AS Keyword

Tue, 23 Apr 2019 00:00:00 +0000

Learn what an SQL alias is in this guide.

SQL WHERE Clause: Guide and Examples

Wed, 10 Apr 2019 00:00:00 +0000

In this article, you'll learn what the WHERE clause is in SQL, how to use it, and see some examples.

SQL CTE (WITH Clause): The Ultimate Guide

Mon, 01 Apr 2019 00:00:00 +0000

In this article, you'll learn all about the Common Table Expression, what it's good for, and how to use it.

132 Computer Science Faculty Share Their Advice for New CS Students

Tue, 05 Mar 2019 00:00:00 +0000

I contacted 132 different Computer Science professors and lecturers and asked them for an answer to one question.

How to Create a Connection and Set Up Data for the Introduction to Oracle SQL Course

Wed, 09 Jan 2019 00:00:00 +0000

This post will show you how to set up the sample user and sample data for my Introduction to Oracle SQL course.

PL/SQL Tutorial: Chapter 6

Sun, 16 Dec 2018 00:00:00 +0000

Chapter 6 of the PL/SQL tutorial.

PL/SQL Tutorial: Chapter 7

Sun, 16 Dec 2018 00:00:00 +0000

Chapter 7 of the PL/SQL tutorial.

PL/SQL Tutorial: Chapter 4

Sat, 15 Dec 2018 00:00:00 +0000

Chapter 4 of the PL/SQL tutorial.

PL/SQL Tutorial: Chapter 5

Sat, 15 Dec 2018 00:00:00 +0000

Chapter 5 of the PL/SQL tutorial.

PL/SQL Tutorial: Chapter 1

Thu, 13 Dec 2018 00:00:00 +0000

Chapter 1 of the PL/SQL tutorial.

PL/SQL Tutorial: Chapter 2

Thu, 13 Dec 2018 00:00:00 +0000

Chapter 2 of the PL/SQL tutorial.

PL/SQL Tutorial: Chapter 3

Thu, 13 Dec 2018 00:00:00 +0000

Chapter 3 of the PL/SQL tutorial.

PL/SQL Tutorial

Wed, 12 Dec 2018 00:00:00 +0000

The landing page for the PL/SQL tutorial.

SQL Limit: The Complete Guide to SQL Row Limiting and Top-N Queries

Tue, 20 Nov 2018 00:00:00 +0000

Learn how to use this SQL limit feature in this article.

60 Best Resources for Learning SQL

Mon, 29 Oct 2018 00:00:00 +0000

This list contains 60 different places to learn SQL. Take a look at the list and find one that looks good to you!

SQL Subqueries: The Complete Guide

Mon, 22 Oct 2018 00:00:00 +0000

This article will show you everything you need to know about subqueries in SQL.

4 Books for Programmers I've Read

Sat, 20 Oct 2018 00:00:00 +0000

There are many good books for programmers outside of those that teach how a certain technology or programming language. I've listed some I've read in this article.

79 Data Modeling Tools Compared

Sat, 20 Oct 2018 00:00:00 +0000

This page has a long list of data modelling tools, to help you choose the one that best suits you.

37 Time Management Tips for Software Developers

Fri, 19 Oct 2018 00:00:00 +0000

I've listed a lot of different time management tips that software developers can use to get the most out of their day.

26 Tips on Effective Communication in the Workplace

Tue, 16 Oct 2018 00:00:00 +0000

Communication skills are an important part of your career as an IT professional. Learning how to have effective communication in the workplace in this article.

32 Tips on How to Improve Programming Skills

Wed, 10 Oct 2018 00:00:00 +0000

In this article, I've shared a range of tips on how to improve programming skills, which I hope you can benefit from!

A Guide to Long-Term Career Goals and Career Planning for Software Developers

Mon, 08 Oct 2018 00:00:00 +0000

Learn some career planning advice.

A Guide to Job Interviews

Sun, 07 Oct 2018 00:00:00 +0000

Learn some job interview tips.

A Guide to LinkedIn for Software Developers

Fri, 05 Oct 2018 00:00:00 +0000

LinkedIn is a great tool for your career as a developer. Learn how to use it and some tips in this article.

Creating a Web App

Thu, 04 Oct 2018 00:00:00 +0000

My story on creating a web app.

A Guide on How to Get a Job as a Programmer

Mon, 01 Oct 2018 00:00:00 +0000

How to find a programming job

A Guide to Starting a New Job as a Software Developer

Mon, 01 Oct 2018 00:00:00 +0000

In this guide, you'll learn what to expect, what to do on your first day, and how to improve when starting a new job.

72 Ways to Improve Work Performance as a Developer

Sun, 30 Sep 2018 00:00:00 +0000

Learn how to improve your work performance.

Oracle SQL PIVOT and UNPIVOT: The Complete Guide

Mon, 17 Sep 2018 00:00:00 +0000

Learn how to use the PIVOT feature in Oracle.

JDBC in Java, Hibernate, and ORMs: The Ultimate Resource

Tue, 11 Sep 2018 00:00:00 +0000

Improve your knowledge of Java and database connections with this collection of guides and resources.

24 Database Design Mistakes and How to Avoid Them

Fri, 17 Aug 2018 00:00:00 +0000

In this article, I’ve listed 24 different database design mistakes that you should try to avoid.

SQL Views and Materialized Views: The Complete Guide

Thu, 26 Jul 2018 00:00:00 +0000

By the end of this article, you’ll know all about views, materialized views, how to create them, their advantages, and much more.

SQL DISTINCT: The Complete Guide

Tue, 24 Jul 2018 00:00:00 +0000

Learn what the SQL DISTINCT keyword is in this guide.

SQL Set Operators: The Complete Guide to UNION, INTERSECT & MINUS

Thu, 19 Jul 2018 00:00:00 +0000

In this article, you’ll learn all about set operators such as these, why they are used, and see some examples.

SQL Operators: The Complete Guide

Tue, 17 Jul 2018 00:00:00 +0000

SQL operators include EXISTS, IN, LIKE, BETWEEN, and many more. We'll look at each of them in this guide.

SQL Stored Procedures: The Complete Guide (Oracle, SQL Server, MySQL, PostgreSQL)

Thu, 12 Jul 2018 00:00:00 +0000

Do you want to know what a stored procedure is, how it can help your SQL, and how to create one? Find out in this guide.

Database Keys: The Complete Guide (Surrogate, Natural, Composite & More)

Tue, 10 Jul 2018 00:00:00 +0000

In this article, you’ll learn what these terms are, so you can communicate better with other developers and understand other online tutorials that use these terms.

SQL Merge: The Complete Guide

Tue, 22 May 2018 00:00:00 +0000

Learn how to use the MERGE command in SQL.

SQL Joins: The Complete Guide

Mon, 14 May 2018 00:00:00 +0000

Let's take a look at what SQL joins are, how to use them, and see some examples.

50 SQL Experts Reveal Their Top 3 Tools for SQL Development and Administration

Wed, 02 May 2018 00:00:00 +0000

There are a large number of tools available for Oracle SQL developers and DBAs to use. It’s hard to know which tools are useful, will help you get the job done, and are widely used so you can get support easily.

Oracle 18c Guide and FAQ

Tue, 20 Feb 2018 00:00:00 +0000

A guide to the Oracle 18c database.

Complete List of Oracle Conferences

Mon, 12 Feb 2018 00:00:00 +0000

A list of Oracle conferences

How to Become a Database Developer: The Definitive Guide

Tue, 09 Jan 2018 00:00:00 +0000

Learn how to become a database developer in this guide.

SQL UPPER, LOWER, and INITCAP Function Guide, FAQ & Examples

Sat, 06 Jan 2018 00:00:00 +0000

Changing the case of text in SQL is a common task when comparing strings or validating data. Learn how to do it with the UPPER, LOWER, and INITCAP functions in this article.

Oracle Interval Functions Guide, FAQ & Examples

Fri, 05 Jan 2018 00:00:00 +0000

Oracle’s two INTERVAL data types are used to store a period of time. Learn how to use them and see some examples in this article.

Oracle Mathematical Functions

Fri, 05 Jan 2018 00:00:00 +0000

Learn how to use the mathematical functions in Oracle.

Oracle SQLCODE and SQLERRM Function Guide, FAQ, & Examples

Fri, 05 Jan 2018 00:00:00 +0000

You can use the SQLCODE and SQLERRM functions to do that. Learn how the functions work and see some examples in this article.

Oracle TO_BINARY_DOUBLE and TO_BINARY_FLOAT Functions

Wed, 03 Jan 2018 00:00:00 +0000

In this article, I’ll explain what the TO_BINARY_DOUBLE and TO_BINARY_FLOAT functions do and show you some examples.

Oracle LOB Functions FAQ, Guide, and Examples

Tue, 02 Jan 2018 00:00:00 +0000

In this article, we’ll look at the different LOB functions available in Oracle, learn what they do, and see some examples.

SQL NVL, ISNULL, and Other Logical Function Guide, FAQ, and Examples

Mon, 01 Jan 2018 00:00:00 +0000

There are several functions in SQL, such as NVL and ISNULL, that perform some kind of logic on the values that are provided. Learn what they all do and see some examples in this article.

SQL MOD and REMAINDER Function Guide, FAQ, and Examples

Sun, 31 Dec 2017 00:00:00 +0000

The SQL MOD and REMAINDER functions are very similar and are useful for working with numbers and even for other operations. Learn what they are, and the differences, in this article.

Oracle Variance Functions Guide, FAQ, and Examples

Tue, 26 Dec 2017 00:00:00 +0000

In this article, we’ll look at a range of Variance functions, explain what they do, and see some examples.

How to Calculate the Mean, Median, and Mode in Oracle

Mon, 25 Dec 2017 00:00:00 +0000

Calculating the mean, median, and mode in Oracle SQL is a task often performed by report developers or anyone else working with SQL. Learn how to calculate these three values from a range of data in this article.

Oracle Timezone Functions Guide, FAQ, and Examples

Sun, 24 Dec 2017 00:00:00 +0000

In this article, we’ll look at the FROM_TZ, TZ_OFFSET, TO_TIMESTAMP_TZ, and NEW_TIME functions in Oracle, explain how they work, and see some examples.

SQL LENGTH/LEN Function Guide, FAQ, and Examples

Sun, 24 Dec 2017 00:00:00 +0000

In this article, we’ll look at the LENGTH function and its variants, and the VSIZE function, explain how they work, and see some examples.

SQL CHR, CHAR, ASCII, NCHR, NCHAR, and ASCIISTR Function Guide, FAQ, and Example

Sat, 23 Dec 2017 00:00:00 +0000

The SQL CHR, CHAR, ASCII, NCHR, NCHAR, and ASCIISTR functions are useful when translating between text characters and their ASCII codes. Learn all about these functions in this article.

SQL INSTR Functions Explained with Examples

Fri, 22 Dec 2017 00:00:00 +0000

In this article, we’ll look at the INSTR function (including its variants), explain how to use it, and see some examples.

SQL GREATEST and LEAST Function Guide, FAQ, & Examples

Thu, 21 Dec 2017 00:00:00 +0000

The SQL GREATEST function and LEAST function are quite useful, but not very well understood. Let’s take a look at these functions and see some examples in this article.

SQL POWER and SQRT Function Guide, FAQ & Examples

Wed, 20 Dec 2017 00:00:00 +0000

In this article, we’ll look at both the POWER and SQRT functions, explain how they work, and see some examples.

Oracle TRIM, LTRIM & RTRIM Function Guide, FAQ & Examples

Mon, 11 Dec 2017 00:00:00 +0000

In this article, you’ll learn all about the three TRIM functions in Oracle (TRIM, LTRIM, and RTRIM).

SQL LEAD and LAG Function Guide, FAQ, and Examples

Wed, 06 Dec 2017 00:00:00 +0000

The SQL LEAD function and SQL LAG function can be very useful for finding data in your result set and simplifying your queries. Learn all about them in this article.

Oracle NEXT_DAY and LAST_DAY Function Guide, FAQ, and Examples

Sun, 26 Nov 2017 00:00:00 +0000

The Oracle NEXT\DAY and LAST_DAY functions are similar functions used to determine dates. Learn more about what they can do and their differences in this article.

SQL CEIL and FLOOR Function Guide, FAQ, and Examples

Sat, 18 Nov 2017 00:00:00 +0000

The SQL CEIL function and FLOOR function are opposites of each other and are very useful functions when dealing with numbers. Learn what they are and see some examples in this article.

The Complete Guide to Oracle Sequences

Mon, 13 Nov 2017 00:00:00 +0000

In this article, I’ll explain what an Oracle sequence is, how to create one, and how to use them.

The Complete Guide to Oracle REGEXP Functions

Mon, 06 Nov 2017 00:00:00 +0000

Are you confused by Oracle regular expressions? Want to know how to use them to get the information you need for your queries? Learn all about Oracle REGEXP functions in this article.

Oracle SYSDATE Function Guide, FAQ, & Examples

Mon, 30 Oct 2017 00:00:00 +0000

Oracle SYSDATE is one of the most popular functions in Oracle. Learn what it does and how to SELECT and INSERT it in this article.

The Complete Guide to Oracle Synonyms

Mon, 23 Oct 2017 00:00:00 +0000

In this article, I’ll explain all you need to know about Synonyms.

Oracle SCN_TO_TIMESTAMP and TIMESTAMP_TO_SCN Functions

Mon, 16 Oct 2017 00:00:00 +0000

In this article, I’ll explain what an SCN is and how to use both the SCN\_TO\_TIMESTAMP and TIMESTAMP\_TO\_SCN function.

SQL LPAD and RPAD Function Guide, FAQ & Examples

Sat, 07 Oct 2017 00:00:00 +0000

The SQL LPAD and RPAD functions can be quite useful in your queries. Learn more about the LPAD and RPAD functions and see some examples in this article.

Database Normalization: A Step-By-Step-Guide With Examples

Sat, 30 Sep 2017 00:00:00 +0000

In this article, I’ll explain what normalisation in a DBMS is and how to do it, in simple terms.

What Are The DML, DDL, and TCL Commands in SQL?

Mon, 25 Sep 2017 00:00:00 +0000

There are three main types of SQL statements in SQL. Learn what they are and what the commands are in this article.

Oracle SYS_EXTRACT_UTC Function Guide, FAQ, and Examples

Tue, 19 Sep 2017 00:00:00 +0000

In this article, I’ll explain what the SYS\_EXTRACT\_UTC function does and show you some examples.

Oracle Date Functions: The Complete Guide

Mon, 11 Sep 2017 00:00:00 +0000

There are many different date and time functions in Oracle, and they behave differently than other databases. Learn what they are and see some useful queries in this article.

How to Escape Single Quotes in SQL

Mon, 01 May 2017 00:00:00 +0000

Do you need to escape special characters or escape a single quote in SQL? Learn how to do that in this article.

ORA-20000 Cause and Solution

Wed, 12 Apr 2017 00:00:00 +0000

Have you gotten the ORA-20000 error when working with Oracle PL/SQL? Learn what causes it and how to resolve it in this article

TNSNAMES.ORA File - The Complete Guide

Mon, 10 Apr 2017 00:00:00 +0000

The TNSNAMES.ORA file is an important file when working with Oracle. Learn all about what it is, its location, and how to create and edit it in this article.

ORA-12514 Cause and Solution

Fri, 07 Apr 2017 00:00:00 +0000

Are you getting an "ORA-12514 TNS listener does not currently know or service requested in connect descriptor" error? Learn what causes it and how to resolve it in this error.

SQL Glossary of Terms

Thu, 30 Mar 2017 00:00:00 +0000

SQL, and database development in general, contains a lot of terms and acronyms. Check out this SQL glossary to help understand them.

ORA-01400: cannot insert null into (string) Solution

Wed, 29 Mar 2017 00:00:00 +0000

Have you gotten the "ORA-01400 cannot insert null into (string)" error? Learn what causes this and how to resolve it in this article.

ORA-00972 identifier is too long Solution

Fri, 24 Mar 2017 00:00:00 +0000

Have you gotten an "ORA-00972 identifier is too long" error? Learn what caused it and how to resolve it in this article.

ORA-00001 Unique Constraint Violated Solution

Wed, 22 Mar 2017 00:00:00 +0000

Have you gotten an "ORA-00001 unique constraint violated" error? Learn what has caused it and how to resolve it in this article.

SQL ORDER BY - The Complete Guide

Mon, 20 Mar 2017 00:00:00 +0000

The SQL ORDER BY clause and functionality is an important part of a SELECT statement. Learn what it does and how to use it in this article.

ORA-00609 and ORA-609 Solution

Fri, 17 Mar 2017 00:00:00 +0000

Have you gotten an ORA-00609 error or ORA-609 error? Learn how to fix it and what the cause is in this article.

ORA-12154 TNS Connection Identifier Solution

Wed, 15 Mar 2017 00:00:00 +0000

Have you gotten an "ORA-12154 TNS could not resolve the connect identifier specified" error? Learn what causes it and how to resolve it in this article.

The Difference Between WHERE and HAVING Clause

Mon, 13 Mar 2017 00:00:00 +0000

What is the difference between WHERE and HAVING clause in SQL? Learn what they are and the differences in this article.

ORA-01031 insufficient privileges Solution

Fri, 10 Mar 2017 00:00:00 +0000

Are you getting the "ORA-01031 insufficient privileges" error? Learn what causes this error and how to resolve it in this article.

ORA-00937: not a single-group group function Solution

Wed, 08 Mar 2017 00:00:00 +0000

Have you received an ORA-00937 not a single-group group function error? Learn what it is and how to fix it in this article.

69 SQL Interview Questions and Answers (Including Interview Tips)

Mon, 06 Mar 2017 00:00:00 +0000

In this guide, you'll see a range of SQL interview questions and answers.

ORA-00907: missing right parenthesis Solution

Fri, 03 Mar 2017 00:00:00 +0000

Did you get an ORA-00907 missing right parenthesis error? Learn what caused it and how to resolve it in this article.

ORA-06502 PLSQL numeric or value error Solution

Wed, 01 Mar 2017 00:00:00 +0000

Are you getting an ORA-06502 error message when working with Oracle SQL? Learn how to resolve it and what causes it in this article.

ORA-06550 line N column N Solution

Fri, 24 Feb 2017 00:00:00 +0000

Are you getting the ORA-06550 error when running an SQL statement? Learn the cause of this error and the solution in this article.

How To Resolve ORA-00933 SQL Command Not Properly Ended

Wed, 22 Feb 2017 00:00:00 +0000

Are you getting the ORA-00933: SQL command not properly ended error? Learn what causes it and how to resolve it in this article.

ORA-00933: sql command not properly ended

This error is caused by an SQL statement with a clause that is not allowed for that statement. Some examples that might cause this error are:

An INSERT statement with an ORDER BY clause or an INNER JOIN
A DELETE statement with an INNER JOIN or ORDER BY clause
An UPDATE statement with an INNER JOIN

ORA-00933 Solution

The solution to the ORA-00933 error is to update your query to remove the clause that's causing the issue. This would depend on the type of query being run.

ORA-00936: missing expression Solution

Wed, 15 Feb 2017 00:00:00 +0000

Did you get an ORA-00936: missing expression error? Learn what it means and how to resolve it in this article.

ORA-00936 Cause

The error you've gotten is this:

1ORA-00936: missing expression

Oracle's official "cause and action" that appears along with the error is:

1Cause: A required part of a clause or expression has been omitted.
2For example, a SELECT statement may have been entered without a list of columns or
3expressions or with an incomplete expression.
4This message is also issued in cases where a reserved word is misused, as in SELECT TABLE.
5
6Action: Check the statement syntax and specify the missing component.

So, in summary, the query is missing some clause that it needs in order to run.

ORA-00911 invalid character Solution

Fri, 10 Feb 2017 00:00:00 +0000

Are you getting an "ORA-00911 invalid character" error when running an SQL statement? Find out what causes it and how to resolve it in this article.

ORA-06512 At Line Solution

Wed, 08 Feb 2017 00:00:00 +0000

Did you get an ORA-06512 error when running an SQL query? Learn what this error is and how to resolve it in this article.

Difference Between CHAR, VARCHAR, and VARCHAR2 Data Types in Oracle

Mon, 06 Feb 2017 00:00:00 +0000

Oracle has several character data types that are commonly used and can also be confusing if you don't know the differences between them. Learn what they are and the differences between them in this article.

ORA-01722 invalid number Solution

Fri, 03 Feb 2017 00:00:00 +0000

Learn all about the ORA-01722 error in this guide.

How to Resolve ORA-01017 Invalid Username/Password; Logon Denied

Wed, 01 Feb 2017 00:00:00 +0000

Have you gotten an ORA-01017 error in your Oracle database? Learn what caused it and how you can resolve it in this article.

Oracle SQL List Tables in Database or Schema

Mon, 30 Jan 2017 00:00:00 +0000

Do you need to list all tables in Oracle? There isn't an SQL list tables command, but you can learn how to show all tables in this article.

ORA-00942 table or view does not exist Solution

Fri, 27 Jan 2017 00:00:00 +0000

Have you gotten an ORA-00942 error? I'll explain the cause and the solution of the error in this article.

ORA-00904 invalid identifier Solution

Wed, 25 Jan 2017 00:00:00 +0000

Did you get an "ORA-00904 invalid identifier" error? Find out what caused the ORA-00904 error and how to resolve it in this article.

Oracle Triggers - The Complete Guide

Mon, 23 Jan 2017 00:00:00 +0000

Oracle triggers are a handy but often misused function of the Oracle database. Learn all about them in this article.

What's The Difference Between Oracle ROWNUM vs Oracle ROW_NUMBER?

Mon, 16 Jan 2017 00:00:00 +0000

Have you seen ROWNUM and ROW\_NUMBER in Oracle and wondered what the difference is? Learn what they are and the differences between Oracle ROWNUM vs Oracle ROW\_NUMBER in this article.

Singular vs Plural and Other Database Table Naming Conventions

Mon, 02 Jan 2017 00:00:00 +0000

Are you wondering if you should name your SQL database tables in the singular form or plural form? Learn what the preferred convention is and some reasoning behind it, as well as other database table naming conventions, in this article.

Oracle Certification Dumps Can Ruin Your Career

Mon, 05 Dec 2016 00:00:00 +0000

Are you looking to get certified? Want to get your hands on some Oracle certification dumps for an exam to help you pass? That's a bad idea. I'll explain why in this article.

Oracle TO_DATE Function Usage, Tips & Examples

Tue, 15 Nov 2016 00:00:00 +0000

The Oracle TO\_DATE function is one of the most common and useful string manipulation functions in Oracle, but it can be confusing. I'll explain how to use the TO\_DATE function in this article.

A Guide to the Oracle Data Types

Mon, 24 Oct 2016 00:00:00 +0000

In this article, I explain what the different data types are in Oracle database and everything you need to know about them.

Overview of Oracle Character Sets

Mon, 03 Oct 2016 00:00:00 +0000

This article will answer some of the common questions, and questions I had about Oracle character sets and how they relate to the Oracle database.

How I Organise Email At Work To Keep Track Of It All

Mon, 12 Sep 2016 00:00:00 +0000

I explain how I organise my email at work in this article.

What Does SQL PARTITION BY Do?

Mon, 29 Aug 2016 00:00:00 +0000

Have you ever seen the PARTITION BY keyword used in SQL queries? If so, do you know what it does and how to use it? Learn about the SQL PARTITION BY keyword and see some examples in this article.

65 Business Jargon Phrases to Stop Using and What To Use Instead

Mon, 22 Aug 2016 00:00:00 +0000

Learn a range of business jargon phrases in this article.

Oracle BFILENAME Function Explained with Examples

Thu, 11 Aug 2016 00:00:00 +0000

The Oracle BFILENAME function is a useful file manipulation function. Learn what it is and how to use it in this article.

Oracle 12c New Features for Developers

Mon, 01 Aug 2016 00:00:00 +0000

Oracle 12c is Oracle's latest version of its database engine. Learn about all of the new Oracle 12c new features for developers in this massive guide.

How to Find the Row That Has the Maximum Value for a Column in Oracle

Mon, 25 Jul 2016 00:00:00 +0000

Do you need to find the data for a row that has the maximum value for a specific column in Oracle? Learn how to do it and see some alternative answers in this article.

How Can You Create A Column With AUTO_INCREMENT in Oracle SQL?

Mon, 18 Jul 2016 00:00:00 +0000

If you've used MySQL, you're probably familiar with the AUTO\_INCREMENT feature. But it's not available in Oracle. Read this article to find out how you can auto increment a column in Oracle SQL.

How To Resolve ORA-00979 Not a GROUP BY Expression

Mon, 11 Jul 2016 00:00:00 +0000

Have you tried to run a query and got the "ORA-00979 not a group by expression" error? Learn what it is and how to resolve the error in this article.

What is the DUAL Table in Oracle?

Mon, 04 Jul 2016 00:00:00 +0000

Have you seen SQL statements with the word DUAL in them? Wondering what it is? Find out what the dual table in Oracle is in this article.

Oracle SOUNDEX Function with Examples

Thu, 30 Jun 2016 00:00:00 +0000

The Oracle SOUNDEX function is one of the most interesting functions I've used in Oracle. Learn what it is and how it works in this article.

How to Limit the Number of Rows in Oracle SQL After Ordering

Mon, 18 Apr 2016 00:00:00 +0000

In this article, I'll show you how you can limit the number of rows in Oracle SQL.

How to Select Rows with Max Value for a Column in Oracle SQL

Mon, 04 Apr 2016 00:00:00 +0000

A common question in Oracle SQL, and SQL in general, is to select rows that match a maximum value for a column. Let's see how you can do that in SQL.

Oracle SYS_CONTEXT Function with Examples (including Oracle 12C)

Sun, 13 Mar 2016 00:00:00 +0000

The SYS\_CONTEXT function is an Oracle function that checks configuration values on the database. Learn how to use it and see some examples in this article.

189 Career Quotes To Motivate and Inspire You

Mon, 18 Jan 2016 00:00:00 +0000

This article has a list of career quotes.

Oracle EXTRACT Function Explained with Examples

Thu, 31 Dec 2015 00:00:00 +0000

The Oracle EXTRACT function is very useful when you're doing any work with a date field or date expression. Let's learn what it is and see some examples in this article.

Oracle DUMP Function Explained with Examples

Thu, 17 Dec 2015 00:00:00 +0000

The Oracle DUMP function tells you the data type of an expression. Let's learn how to use it and see some examples in this article.

88 of the Best Programmer Jokes

Mon, 30 Nov 2015 00:00:00 +0000

In this article, I've listed a whole bunch of programmer jokes that only programmers will understand!

Oracle CONVERT Function Explained with Examples

Thu, 26 Nov 2015 00:00:00 +0000

The Oracle CONVERT function doesn't do what you might expect it do, if you just look at its name. Learn what this function does and how to use it in this article.

How to Start an SQL Developer Debug Session

Mon, 23 Nov 2015 00:00:00 +0000

Learn how to use the SQL Developer debug feature.

Oracle TRANSLATE Function Explained with Examples

Thu, 19 Nov 2015 00:00:00 +0000

The Oracle TRANSLATE function is a similar function to REPLACE, but it has a few differences. Learn what the differences are and see some examples in this article.

SQL RANK and DENSE_RANK: Function Guide, FAQ, and Examples

Thu, 12 Nov 2015 00:00:00 +0000

In this article, you'll learn everything about the SQL RANK and DENSE\_RANK functions that are available in Oracle, SQL Server, MySQL, and Postgres.

Using the SQL Developer Export Functionality for Data and Query Results

Thu, 22 Oct 2015 00:00:00 +0000

In this article, I'll explain how you can use the SQL Developer export functionality.

Oracle TO_TIMESTAMP Function with Examples

Thu, 08 Oct 2015 00:00:00 +0000

The Oracle TO\_TIMESTAMP function is useful if you need to work with timestamp data types. Learn how to use it with some examples in this article.

How To Use and Run The SQL Developer Execution Plan

Wed, 30 Sep 2015 00:00:00 +0000

One of the most valuable features for writing SQL queries is seeing how long it will take to run and how efficient it is. In SQL Developer, there's an option called "Explain Plan". Let's see how that works.

185 Software Development Acronyms

Mon, 24 Aug 2015 00:00:00 +0000

In the world of software development, we use and see a lot of acronyms. In this article, I've listed a lot of common acronyms, along with definitions, which can help your understanding in the workplace.

How To Turn On and Use SQL Developer DBMS_OUTPUT

Thu, 20 Aug 2015 00:00:00 +0000

In this article, I'll explain what the DBMS\_OUTPUT function is and how it works in SQL Developer.

How To Use The SQL Developer Export Connections With Passwords Function

Thu, 13 Aug 2015 00:00:00 +0000

Oracle's SQL Developer tool lets you export a list of connections that you have created. This is great for saving time for your team. Learn how you can do that in this article.

Oracle ADD_MONTHS Function with Examples

Thu, 06 Aug 2015 00:00:00 +0000

In this article, I'll explain how the very useful ADD\_MONTHS function works and use some examples.

How To Use the SQL Developer Format SQL Options

Wed, 05 Aug 2015 00:00:00 +0000

In this article, I'll explain what formatting SQL is, and how to find the SQL Developer Format SQL options.

How To Turn On or Off SQL Developer Autocommit Settings

Fri, 10 Jul 2015 00:00:00 +0000

In this article, I'll explain what the SQL Developer Autocommit feature is, where to find it, and how to turn it on or off.

How To Turn On Line Numbers in SQL Developer

Wed, 08 Jul 2015 00:00:00 +0000

In this article, I'll show you what line numbers are in SQL Developer and how to turn this setting on.

SQL NULLIF Function Explained with Examples

Thu, 18 Jun 2015 00:00:00 +0000

The SQL NULLIF function is available in many vendors. Let's take a look at what NULLIF does and what you can use it for.

Oracle SUBSTR Function Explained with Examples

Sat, 23 May 2015 00:00:00 +0000

The Oracle SUBSTR function is used to get a smaller string (the substring) from within a larger string. Let's take a look at how you can use it and some examples.

Oracle LISTAGG Function Usage, Tips & Examples

Thu, 14 May 2015 00:00:00 +0000

This article explains the Oracle LISTAGG functions, which is one of the more difficult functions to understand.

Purpose of the Oracle LISTAGG Function

The purpose of the Oracle LISTAGG function is to allow you to perform aggregation of strings from data in columns.

What is string aggregation? Well, it's a technique similar to concatenation, but it allows you to aggregate data in a GROUP BY, combining strings that have matches in a value in another column.

How to Convert Data Types in Oracle SQL

Tue, 05 May 2015 00:00:00 +0000

When using Oracle SQL, there are many ways to convert data types. Three of the most common data types are string (VARCHAR2), number, and date. Let's take a look at how you can convert to these types.

SQL COALESCE Function Usage, Tips & Examples

Thu, 16 Apr 2015 00:00:00 +0000

Learn about the SQL COALESCE function in this guide.

SQL ROUND Function with Examples

Thu, 02 Apr 2015 00:00:00 +0000

The SQL ROUND function allows you to round a number to a specific number of decimal places. Let's see how it works and see some examples.

Oracle TRUNC Function Explained with Examples

Thu, 26 Mar 2015 00:00:00 +0000

The TRUNC function is one of the most common and versatile functions in Oracle. Let's take a look at how it's used and some examples.

Oracle CONCAT Function with Examples

Thu, 19 Mar 2015 00:00:00 +0000

The Oracle CONCAT function is not a very widely used function, but still helpful. Learn more about the CONCAT function in this article.

Oracle REPLACE Function Usage, Tips & Examples

Thu, 26 Feb 2015 00:00:00 +0000

The Oracle REPLACE function is another string manipulation function within Oracle. Learn how to use it and some common examples in this article.

Oracle DECODE Function Explained with Examples

Thu, 19 Feb 2015 00:00:00 +0000

The Oracle DECODE function can be confusing to those who have never used it. It's a useful function for comparing values. Learn more about this function and some examples in this article.

Oracle TO_CHAR Function Explained with Examples

Thu, 08 Jan 2015 00:00:00 +0000

In this article and video, I'll explain how to use the TO\_CHAR function.

Oracle TO_NUMBER Function Usage, Tips & Examples

Tue, 30 Dec 2014 00:00:00 +0000

The Oracle TO_NUMBER function is one of the most common number manipulation functions in Oracle. In this article and video, I'll explain how to use the TO_NUMBER function.

In this article, you'll learn:

What the TO_NUMBER function does
The syntax and parameters of the TO_NUMBER function
Several examples of queries with the TO_NUMBER function
Answers to some FAQ on this function

What Is The Oracle TO_NUMBER Function?

The Oracle TO_NUMBER function is used to convert a text value to a number value.

8 Simple Steps For How to Become a Database Administrator

Thu, 16 Oct 2014 00:00:00 +0000

Learn how to become a database administrator with the simple steps in this article.

How To Convince Your Employer To Pay For Your Certification

Thu, 03 Jul 2014 00:00:00 +0000

Convince your employer to pay for your certification

6 Easy And Actionable Steps On How To Design A Database

Mon, 21 Apr 2014 00:00:00 +0000

Whether it's for your workplace or home project, learning how to design a database is a valuable skill. Let's take a look at six easy steps on how to design a database.

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