SQL is an ANSI (American National Standards Institute) standard for accessing database systems. SQL statements are used to retrieve and update data in a database. This interactive SQL tutorial not only provides easy-to-understand basic SQL instructions, but it allows you to practice what you learn using the on-line SQL interpreter. You will receive immediate results after submitting your SQL commands. If you're already familiar with the basics of SQL, you can still use this as a refresher, and practice some SQL statements.