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number of times a substring met in a string

Asher Tarnopolski
Ranch Hand

Joined: Jul 28, 2001
Posts: 260
i wanna run on mysql table a method which will return the
entries where a substring is met a wanted number of times in a varchar type field.
for example, let's say there are 4 entries, which varchar field look like this :
| a |
| aaa |
| abacad |
| bagafaca |
i wanna get all lines where "a" is met 3 times, so second and third lines only will be returned.
i didn't find any mysql function which seems to be helpful, may be you have ideas about it?

Asher Tarnopolski
Joe Ess

Joined: Oct 29, 2001
Posts: 9124

SQL LIKE might get you what you want, but you will probably have to do some extra work to weed out the strings that contain more than the given number of substrings.

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Jeanne Boyarsky
author & internet detective

Joined: May 26, 2003
Posts: 32298

Joe is right about the like. If you use two like statements, you can get what you are looking for. Keep in mind that this query is probably slow.
select * from table where field like "%a%a%a%"
and field not like "%a%a%a%a%"

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