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Sams Teach Yourself MySQL in 21 Days, Second Edition
book

Sams Teach Yourself MySQL in 21 Days, Second Edition

by Tony Butcher
December 2002
Beginner content levelBeginner
640 pages
16h 41m
English
Sams
Content preview from Sams Teach Yourself MySQL in 21 Days, Second Edition

Joining Tables

Joins are a fundamental aspect of relational databases. They allow you to extract data on entities related by design—represented by related tables—in your database.

A join occurs when you retrieve data from tables related by some shared data, often (but not necessarily) a shared reference number or index. For example, if you have a table of customers and a table of orders, good design in a relational database will ensure that the two are related together by some common data between the tables, perhaps by storing a customer number on every order record. By performing a join, you can retrieve information in a resultset where each row combines data from both tables: information about each order will be combined with information about ...

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Publisher Resources

ISBN: 0672323923Purchase book