SQL is a database computer language designed for the retrieval and management of data in relational database. SQL stands for Structured Query Language.
This tutorial will give you quick start with SQL.
This reference has been prepared for the beginners to help them understand the basic to advanced concepts related to SQL languages.
Before you start doing practice with various types of examples given in this reference, I'm making an assumption that you are already aware about what is database, especially RDBMS and what is a computer programming language.
1 - SQL Quick Reference Guide
A quick SQL reference guide for SQL Programmers.
2 - SQL Built-In Useful Functions
A comprehensive list of important SQL Functions.
3 - SQL Useful Resources
A collection of SQL Sites, Books and Articles is given at this page.
4 - Tuning the Database System
Few points for Database Administrator to fine tune a database performance.
5 - SQL Tutorial in PDF
Download a quick SQL tutorial in PDF format.