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	Wikipedia: SQL - http://en.wikipedia.org/wiki/SQL History and overview of the language.
	A Gentle Introduction to SQL - http://sqlzoo.net/ An interactive tutorial. Allows access to tables using any of Oracle, SQL Server, MySQL, Access or PostgreSQL engines.
	An Introduction to Database Normalization - http://dev.mysql.com/tech-resources/articles/intro-to-normalization.html 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.
	SQL for Web Nerds - http://philip.greenspun.com/sql/ A nicely structured manuscript on SQL by Philip Greenspun, based on the Oracle database. Queries, transactions, triggers, and RDBMS concepts are covered.
	Database and SQL eLearning - http://db.grussell.org/ 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.

	SQL Tutorial - http://www.1keydata.com/sql/sql.html This site aims to teach beginners the building blocks of SQL.
	An Introduction to Structured Query Language (SQL) - http://www.techbookreport.com/sql-tut1.html By Pan Pantziarka. From creating a simple database to select queries, joins, updates, inserts.
	SQL exercises - http://www.sql-ex.ru 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.
	SQL Tutorial - http://www.firstsql.com/tutor.htm Complete SQL Tutorial using SQL92.
	SQL Fundamentals - http://databases.about.com/od/sql/a/sqlfundamentals.htm Introduction to SQL

	SQL School - http://www.w3schools.com/sql/ Full set of SQL language tutorials featuring in depth coverage on each SQL command.
	SQL Tutorial - http://www.sql-tutorial.net SQL tutorial featuring a guide to SQL language concepts and SQL commands.
	Fluffycat SQL - http://fluffycat.com/sql/ Examples of how to use SQL commands
	Introduction to Structured Query Language - http://riki-lb1.vet.ohio-state.edu/mqlin/computec/tutorials/SQLTutorial.htm A good introduction to SQL selects, joins and grouping.
	Steve Litt's SQL Troubleshooting Page - http://www.troubleshooters.com/codecorn/lsql.htm Tips on how to troubleshoot SQL queries.

	Summarizing data with SQL (Structured Query Language) - http://www.paragoncorporation.com/ArticleDetail.aspx?ArticleID=6 This article provides a brief SQL How-to on how to summarize data. Most of the examples we provide will be based on the ANSI-SQL 92 standard. Some examples will show features specific to SQL Server 7.
	SQL Cheat Sheet: Query By Example - http://www.paragoncorporation.com/ArticleDetail.aspx?ArticleID=27 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.
	SQLCourse - http://www.sqlcourse.com/ Interactive/On-line SQL Tutorial with SQL Interpreter and live practice database.
	SQLcourse2 - http://www.sqlcourse2.com/ Online SQL tutorial featuring a live interpreter to test SQL commands.
	SQL In Simple English - http://www.codecoffee.com/articles/sql1.html SQL presented as a questions and answers session, with questions that novices would like to ask.

	Intro To Structured Query Language (SQL) - http://www.thundersoftware.com/churchdb/sqltutorial/sql_tutorial.html A basic introduction to writing queries so that beginners can begin to extract data from an existing relational database.
	Thomas Beck's Home Page - http://www.thomas.beck.name/ Physical Data Model Patterns.
	Kihlman's SQL (Graphic SQL tutorial) - http://sql.kihlman.eu/ This program helps you learn SQL, Structured Query Language. You can use the test questions or make your own SQL statements. [Shareware]
	SQL Tutorial by Josh Grant - http://comclub.dyndns.org/tutorials/jrgrant/SQLTutorial.txt Brief introduction to basic SQL commands

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