SQL Basics: Writing a Simple Query

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Published Jan 1, 2016

Updated Oct 3, 2019

SQL Basics: Main Tips

SQL is used for reading, writing and modifying data in a database.
It's a standard tool for a variety of databases: MySQL, MS Access, SQL Server, Sybase, Oracle, Postgres, etc.
To practice on your SQL basics, you will need to create your test database or use an online editor for queries.

Example

SELECT * FROM Customers;

Note: if you feel that this is easy, you can skip to a more advanced SQL tutorial like SQL Data Types.

Use SQL for reading, writing and modifying data in a database.
SQL works on various types of databases: MySQL, MS Access, SQL Server, Sybase, Oracle, Postgres, and others.
To practice writing SQL queries, you need to create a database or use an online editor.