SQL for Web Nerds
- A nicely structured manuscript on SQL by Philip Greenspun, based on the Oracle database. Queries, transactions, triggers, and RDBMS concepts are covered.
- http://philip.greenspun.com/sql/

SQL Fundamentals
- Introduction to SQL
- http://databases.about.com/od/sql/a/sqlfundamentals.htm

Kihlman's SQL (Graphic SQL tutorial)
- This program helps you learn SQL, Structured Query Language. You can use the test questions or make your own SQL statements. [Shareware]
- http://sql.kihlman.eu/

SQL In Simple English
- SQL presented as a Q&A session, with questions that many novices would like to ask.
- http://www.codecoffee.com/articles/sql1.html

Wikipedia: SQL
- History and overview of the language.
- http://en.wikipedia.org/wiki/SQL

An Introduction to Structured Query Language (SQL)
- By Pan Pantziarka. From creating a simple database to select queries, joins, updates, inserts.
- http://www.techbookreport.com/sql-tut1.html

SQL Cheat Sheet: Query By Example
- 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.
- http://www.paragoncorporation.com/ArticleDetail.aspx?ArticleID=27

SQL exercises
- 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.
- http://www.sql-ex.ru

An Introduction to Database Normalization
- 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.
- http://dev.mysql.com/tech-resources/articles/intro-to-normalization.html

SQL Tutorial
- SQL tutorial featuring comprehensive guide to SQL language concepts and SQL commands.
- http://www.sql-tutorial.net

Database and SQL eLearning
- 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.
- http://db.grussell.org/

SQL Tutorial by Josh Grant
- Brief introduction to basic SQL commands
- http://comclub.dyndns.org/tutorials/jrgrant/SQLTutorial.txt

Thomas Beck's Home Page
- Physical Data Model Patterns.
- http://www.thomas.beck.name/

Summarizing data with SQL (Structured Query Language)
- 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.
- http://www.paragoncorporation.com/ArticleDetail.aspx?ArticleID=6

Intro To Structured Query Language (SQL)
- A basic introduction to writing queries so that beginners can begin to extract data from an existing relational database.
- http://www.thundersoftware.com/churchdb/sqltutorial/sql_tutorial.html

jWorkbook Tutorial
- Excel plug-in software with introduction to SQL
- http://www.sjsoft.com/docs/jworkbook/tutorial/index.htm

Steve Litt's SQL Troubleshooting Page
- Tips on how to troubleshoot SQL queries.
- http://www.troubleshooters.com/codecorn/lsql.htm

A Gentle Introduction to SQL
- An interactive tutorial. Allows access to tables using any of Oracle, SQL Server, MySQL, Access or PostgreSQL engines.
- http://sqlzoo.net/

SQLcourse2
- Online SQL tutorial featuring a live interpreter to test SQL commands.
- http://www.sqlcourse2.com/

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

Fluffycat SQL
- Examples of how to use SQL commands
- http://fluffycat.com/sql/

SQL School
- Full set of SQL language tutorials featuring in depth coverage on each SQL command.
- http://www.w3schools.com/sql/