sql

MondoAperto Servizi Informatici
MondoAperto offers professional services of computer science advising, development and networking.
http://www.mondoaperto.net/

MySQL
MySQL's official homepage by TCX DataKonsult AB.
http://www.mysql.com/

SQL-Server-Performance.Com
Performance tuning and optimization articles and tips on Microsoft SQL Server, including versions 6.5, 7.0, and 2000.
http://www.sql-server-performance.com

Microsoft Corporation
Official site. Find out about products and services, read company news, or check out job openings. Also offers product support, downloads, and learning tools.
http://www.microsoft.com/

SQLCourse
Interactive/On-line SQL Tutorial with SQL Interpreter & live practice database.
http://www.sqlcourse.com/