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目录

SQL Tutorial

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SQL is a standard language for storing, manipulating and retrieving data in databases.

Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.

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Examples in Each Chapter

With our online SQL editor, you can edit the SQL statements, and click on a button to view the result.

Example

SELECT * FROM Customers;
Try it Yourself »

Click on the "Try it Yourself" button to see how it works.

SQL Exercises

Test Yourself With Exercises

Exercise:

Insert the missing statement to get all the columns from the Customers table.

 * FROM Customers;

Start the Exercise

SQL Examples

Learn by examples! This tutorial supplements all explanations with clarifying examples.

See All SQL Examples

SQL Quiz Test

Test your SQL skills at 91xjr!

Start SQL Quiz!

SQL References

At 91xjr you will find a complete reference for keywords and function:

SQL Keyword Reference

MYSQL Functions

SQLServer Functions

MS Access Functions

SQL Quick Reference

SQL Data Types

Data types and ranges for Microsoft Access, MySQL and SQL Server.

SQL Data Types



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