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MySQL Cookbook
book

MySQL Cookbook

by Paul DuBois
October 2002
Intermediate to advanced content levelIntermediate to advanced
1024 pages
27h 26m
English
O'Reilly Media, Inc.
Content preview from MySQL Cookbook

Checking Whether a String Contains a Substring

Problem

You want to know whether a given string occurs within another string.

Solution

Use LOCATE( ).

Discussion

The LOCATE( ) function takes two arguments representing the substring that you’re looking for and the string in which to look for it. The return value is the position at which the substring occurs, or 0 if it’s not present. An optional third argument may be given to indicate the position within the string at which to start looking.

mysql> SELECT name, LOCATE('in',name), LOCATE('in',name,3) FROM metal;
+----------+-------------------+---------------------+
| name     | LOCATE('in',name) | LOCATE('in',name,3) |
+----------+-------------------+---------------------+
| copper   |                 0 |                   0 |
| gold     |                 0 |                   0 |
| iron     |                 0 |                   0 |
| lead     |                 0 |                   0 |
| mercury  |                 0 |                   0 |
| platinum |                 5 |                   5 |
| silver   |                 0 |                   0 |
| tin      |                 2 |                   0 |
+----------+-------------------+---------------------+

LOCATE( ) is not case sensitive as of MySQL 4.0.0, and is case sensitive before that.

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Publisher Resources

ISBN: 0596001452Catalog PageErrata