Ok, Iain. Thanks for the tip !
Iain wrote:
>Just a note based on my experience, if you are going to to use IN processing
>then there is a good chance that the index isn't going to be used. In some
>recent tests I did, the index stopped being used after I put 3 or more items
>in the IN list. You should build some representatve examples of the select
>and test them using "ANALYSE SELECT ..." .I'm using 7.4.1.
>
>The result from the select is the same, even if you don't make an index on
>the function result.It's just a performance consideration. If the index
>isn't used, then you don't need to create it.
>
>regards
>Iain
>----- Original Message -----
>From: "Daniel Henrique Alves Lima" <email_daniel_h@yahoo.com.br>
>To: <pgsql-sql@postgresql.org>
>Sent: Tuesday, March 09, 2004 1:21 PM
>Subject: Re: [SQL] Simple SQL question
>
>
>
>