SQL Transactions and Isolation Levels: The Ultimate Guide

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?

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)

Are you interested in getting the Oracle Certified SQL Associate certification, and passing the 1Z0-071 exam?

If so, then this is the guide for you.

I recently achieved this certification, so in this guide, I’ll explain all there is to know about it.

Keep reading to learn all about this certification and exam.

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

What is an alias in SQL?

It’s a name you give to a column or a table in your SQL query to make it easier to display the results or to write your query.

SQL aliases are a useful feature and are available in all major database vendors, including Oracle, SQL Server, MySQL, PostgreSQL.

There are two types of aliases in SQL: column aliases and table aliases.

SQL WHERE Clause: Guide and Examples

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

A Common Table Expression (or CTE) is a feature in several SQL versions to improve the maintainability and readability of an SQL query.

It goes by a few names:

Common Table Expression
Subquery Factoring
SQL WITH Clause

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

Starting a Computer Science course can be daunting to new students.

There are a lot of new concepts to learn. A new environment to settle in to. And depending on your college, there can be a lot of services offered to students.

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

If you could offer one piece of advice to new Computer Science students, what would it be?

Let me tell you, the insights I received from these professors and lecturers were nothing short of amazing. I’ve listed all of them below.

I’ve also extracted the most common pieces of advice into a summary for you.

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

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