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Computer Hardware

In: English and Literature

Submitted By shakeel123
Words 11641
Pages 47
Introduction to Structured Query Language
This page is a introductory tutorial of the Structured Query Language (also known as SQL) and is a pioneering effort on the World Wide Web, as this is the first comprehensive SQL tutorial available on the Internet. SQL allows users to access data in relational database management systems, such as Oracle, Sybase, Informix, Microsoft SQL Server, Access, and others, by allowing users to describe the data the user wishes to see. SQL also allows users to define the data in a database, and manipulate that data. This page will describe how to use SQL, and give examples. The SQL used in this document is "ANSI", or standard SQL, and no SQL features of specific database management systems will be discussed until the "Nonstandard SQL" section. It is recommended that you print this page, so that you can easily refer back to previous examples. Also, you may be interested in joining the new SQL Club on Yahoo!, where you can read or enter messages in a SQL forum.

Table of Contents
Basics of the SELECT Statement Conditional Selection Relational Operators Compound Conditions IN & BETWEEN Using LIKE Joins Keys Performing a Join Eliminating Duplicates Aliases & In/Subqueries Aggregate Functions Views Creating New Tables Altering Tables Adding Data Deleting Data

Updating Data Indexes GROUP BY & HAVING More Subqueries EXISTS & ALL UNION & Outer Joins Embedded SQL Common SQL Questions Nonstandard SQL Syntax Summary Exercises Important Links

Basics of the SELECT Statement
In a relational database, data is stored in tables. An example table would relate Social Security Number, Name, and Address: EmployeeAddressTable SSN FirstName LastName Address Smith Scott Jones City State Ohio New York Michigan 512687458 Joe 758420012 Mary 102254896 Sam 876512563 Sarah 83 First Street Howard 33 Elm St. Paris Upton

842 Vine Ave. Losantiville Ohio...

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