Thanks. Just needed a confirmation. :-)
Cal Evans wrote:
> Yes and I believe it's explained in the manual better than I can explain it
> here.
>
> Roughly speaking, if the field contains:
>
> foobar
>
> then
>
> LIKE 'foo%' says match anything starting with foo. Since it's STARTING with
> foo then the index can be used. Just like the Index of a book would be
> useless if you wanted to find references in a book for all words ending in
> bar.
>
> LIKE '%foo%' won't use and index either for the same reason.
>
> LIKE '%bar' is right out.
>
> HTH,
> Cal
> http://www.calevans.com
>
> -----Original Message-----
> From: --==[bMan]==-- [mailto:[EMAIL PROTECTED]]
> Sent: Monday, March 26, 2001 7:40 PM
> To: MySQL List
> Subject: Is this a normal behaviour?
>
> O.K. I use MySQL version 3.23 (RedHat 7.0 release) and have a question
> about
> this query:
>
> 1.) [...] LIKE '%pattern'
> 2.) [...] LIKE 'pattern%'
>
> The first query does not use an index while the second does. Is there any
> explenation for this?
>
> Thanks.
>
> --
> Bolek,
>
> URL: http://www.bolek.com
> URL: http://slash.bolek.com
> e-mail: [EMAIL PROTECTED]
> ICQ: 4086197, Address: 402905326
>
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--
Bolek,
URL: http://www.bolek.com
URL: http://slash.bolek.com
e-mail: [EMAIL PROTECTED]
ICQ: 4086197, Address: 402905326
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