An interactive tutorial. Allows access to tables using any of Oracle, SQL Server, MySQL, Access or PostgreSQL engines.

Article by Mike Hillyer. Normalizing data is the most effective way to decrease storage requirements and increase data integrity. In this tutorial we cover the basics of data normalization.

By Pan Pantziarka. From creating a simple database to select queries, joins, updates, inserts.

Database theory and an online tutorial interface to an Oracle database system, allowing a user to learn SQL interactively. The site automatically checks and marks SQL and gives instant feedback.

Examples of how to use SQL commands

A basic introduction to writing queries so that beginners can begin to extract data from an existing relational database.

A good introduction to SQL selects, joins and grouping.

This program helps you learn SQL, Structured Query Language. You can use the test questions or make your own SQL statements. [Shareware]

Provides ANSI-SQL solutions to common database query/update tasks. These apply to such relational databases as PostGreSQL, MySQL, Microsoft SQL Server, Oracle, Microsoft Access, SQLite.

Help everyone to gain or improve skills in building SQL Data Manipulation Language statements. A rating system is supported for SELECT exercises and certification. SQL handbook. English and Russian versions.