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* Regular Expressions, LIKE, and indexes
@ 2006-11-22 19:10 Travis Whitton <tinymountain@gmail.com>
2006-11-22 19:20 ` Re: Regular Expressions, LIKE, and indexes Richard Huxton <dev@archonet.com>
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From: Travis Whitton @ 2006-11-22 19:10 UTC (permalink / raw)
To: pgsql-sql
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* Re: Regular Expressions, LIKE, and indexes
2006-11-22 19:10 Regular Expressions, LIKE, and indexes Travis Whitton <tinymountain@gmail.com>
@ 2006-11-22 19:20 ` Richard Huxton <dev@archonet.com>
0 siblings, 0 replies; 2+ messages in thread
From: Richard Huxton @ 2006-11-22 19:20 UTC (permalink / raw)
To: Travis Whitton <tinymountain@gmail.com>; +Cc: pgsql-sql
Travis Whitton wrote:
>
> SELECT keyword FROM keywords WHERE keyword like 'foo%';
>
> Are there any other functions that can provide equivalent results while
> using an index, or am going to have drop UTF-8 and recreate my database?
UTF-8 isn't your locale, it's your character set (or encoding). Your
locale is something like en_GB.UTF-8 (for British sorting).
You need to define your indexes in such a way that the LIKE can figure
things out. That means using a special operator-class (so that you
redefine how less-than and greater-than are defined). It takes longer to
explain than to do, so I'll direct you to the relevant "CREATE INDEX"
example in the manuals:
http://www.postgresql.org/docs/8.1/static/indexes-opclass.html
--
Richard Huxton
Archonet Ltd
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2006-11-22 19:10 Regular Expressions, LIKE, and indexes Travis Whitton <tinymountain@gmail.com>
2006-11-22 19:20 ` Richard Huxton <dev@archonet.com>
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