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.

SQL is used to insert, search, update, and delete database records. How to Use SQL The following SQL statement selects all the records in the "Customers" table:

What is SQL? SQL stands for Structured Query Language; SQL lets you access and manipulate databases; SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standardization (ISO) in 1987

W3Schools has created an SQL database in your browser. The menu to the right displays the database, and will reflect any changes. Feel free to experiment with any SQL statement.

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The SQL WHERE Clause. The WHERE clause is used to filter records. It is used to extract only those records that fulfill a specified condition.

The SQL SELECT Statement. The SELECT statement is used to select data from a database.

SQL Editor. With our online SQL editor, you can edit SQL statements, and view the result in your browser.

SQL Server has many built-in functions. This reference contains string, numeric, date, conversion, and some advanced functions in SQL Server.

SQL ALTER TABLE Statement. The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints on an existing table.