MySQL is a free SQL database. It’s common with beginners and developers working on small projects, but is also used by large companies to run their systems.
Learning the Basics
59 Best Resources for Learning SQL: A large list of other places to learn SQL
19 Best Database Books: a list of books on database-related topics
SQL Roadmap: a guide on SQL topics from beginner to advanced.
PostgreSQL vs MySQL: An analysis of the differences between PostgreSQL and MySQL.
Basic SQL Statements
SELECT Statement Guide: view data in a table
INSERT Statement Guide: add data to a table
UPDATE Statement Guide: modify data in a table
DELETE Statement Guide: remove data from a table
WHERE Clause: filter data from your query
ORDER BY Clause: specify the order of the results of a Select query
GROUP BY: allows you to group data by values in a column and use aggregate functions
HAVING Clause: allows you to filter data after a group has been applied
DISTINCT: eliminate duplicate rows from your results
Create Table guide: create a new table on the database
Alter Table guide: make changes to an existing table
Drop Table guide: remove a table from the database
Truncate Table guide: remove all data from a table
Joins guide: a guide to joins which are how you combine multiple tables together in a query
One to One joins (video): definition of this join type and an example
One to Many joins (video): definition of this join type and an example
Many to Many joins (video): definition of this join type and an example
Self Join (video): definition of this join type and an example
There are many more objects in a database besides tables. Learn all about them in these guides.
Indexes: a guide to Indexes in SQL
Constraints: rules that can be set on your data
Keys: surograte, natural, primary, foreign, composite, and more
Stored Procedures: a guide to stored procedures in SQL
Views and Materialised Views: objects that let you view data in certain ways
Database Schema: an explanation of this term
Temporary Tables: what it is and how to create one
More features and topics in SQL and MySQL database.
Glossary of Terms: A definition of many terms used in SQL and database development
Data Types: a guide to data types in many different databases
Interview Questions and Answers: a list of 69 interview questions and answers, plus interview tips
DML, DDL, and TCL: a list of SQL commands and what DDL, DML, and TCL mean
Aliases: A guide to column aliases and table aliases in SQL
Subqueries: a guide to subqueries, what they are, and many different examples.
Limiting Results: a guide to SQL row limiting and Top-N queries
CTE (WITH Clause): a guide to Common Table Expressions (CTEs) aka the WITH clause
Transactions and Isolation Levels: an explanation of transactions in SQL and what isolation levels are
Concatenate: what concatenation is and how to do it in SQL
Booleans: how SQL handles booleans and how you can implement them
Wildcards: An explanation of what wildcards are and how to use them
Null: a guide on what NULL is and how to handle them in SQL
Data Warehouses: an in-depth guide to data warehouses
Comments: a guide to comments in SQL and why they can help
Database Version Control, CI, and CD: An in-depth guide on database version control, continuous integration, and continuous deployment
A collection of articles detailing how to do common tasks in SQL queries.
Select Rows with a Max Value: how to select rows with a maximum value for a column
List Tables in a Database: how to list all the tables in a database or a schema
Escape Single Quotes: how to escape single quotes in SQL
Remove Duplicate Records: how to remove duplicate records in SQL