Skip to Main Content
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

Managing Indexes in MySQL

MySQL supports four kinds of indexes:

  • PRIMARY KEY

  • UNIQUE

  • INDEX

  • FULLTEXT

The first two allow only unique values to be used in the column to which they apply. Only one unique index can be designated the PRIMARY KEY, but several indexes can be designated UNIQUE. The third kind permits the reuse of the same value in that column and is denoted by the keyword INDEX.

The fourth index type, FULLTEXT, is intended for speeding up full-text searches within VARCHAR or TEXT type columns. It works with the MATCH function of a WHERE clause, as was explained in Day 8, “Querying Data.” FULLTEXT was added in MySQL version 3.23.23.

As you will see in a moment, you can apply an index on a single column of a table, or on multiple columns. With ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Sams Teach Yourself MySQL

Sams Teach Yourself MySQL

Chris Newman
Oracle® Database 10g Insider Solutions

Oracle® Database 10g Insider Solutions

Arun Kumar R., John Kanagaraj, Richard Stroupe
MySQL and mSQL

MySQL and mSQL

Tim King, George Reese, Randy Yarger
Jump Start MySQL

Jump Start MySQL

Timothy Boronczyk

Publisher Resources

ISBN: 0672323923Purchase book