SQL

SQL, or Structured Query Language, is a special-purpose programming language designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS).^[1]

• SELECT * FROM table_name;
• SQL/Join

• Databases
• Database Fundamentals
• Database Management
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• Oracle SQL Fundamentals

• Wikipedia:SQL
• Wikibooks: Structured Query Language
• A Gentle Introduction to SQL By Andrew Cumming - School of Computing, Napier University, Edinburgh, UK. 1999-2005 (Available in Albanian, German, Spanish, Chinese, French, Italian and Portuguese)
• SQL Tutorial at 1Keydata.com
• SQL Tutorial at SQL-Easy.com
• SQL Quick Reference SQL for common statements across SQL-92, Postgres, Sybase, SQL Server, Oracle and MySQL