From: "Arcadius A." <ahouans@sh.cvut.cz>
Subject: Re: SQL query help!
Date: Wed, 27 Nov 2002 20:34:32 +0100
Organization: Hub.Org Networking Services (http://www.hub.org)
Lines: 44
Message-ID: <as36oc$2ss7$1@news.hub.org>
References: <3DE498E4.2050002@ualg.pt>
To: pgsql-sql@postgresql.org

Hello!

"Luis Sousa" <llsousa@ualg.pt> wrote in message
news:3DE498E4.2050002@ualg.pt...
> This is a cryptographically signed message in MIME format.
>
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> Tell me what did you try with limit and group by.
> Where's IN, why don't you use EXISTS instead. It runs much master !
>


Thanks for the reply!
Alright, I'll use EXISTS instead of IN .... I didn't know that EXISTS is
faster.....

About my query, I have tried :

 "
SELECT * FROM entry where isapproved='y'  AND EXISTS (SELECT id
FROM subcategory WHERE catid='2') ORDER BY subcatid DESC LIMIT 5;
";
This will return only 5 rows....

But when I add the GROUP BY, then I got error
"
SELECT * FROM entry where isapproved='y'  AND EXISTS (SELECT id
FROM subcategory WHERE catid='2') ORDER BY subcatid DESC LIMIT 5 GROUP BY
subcatid;
"

: ERROR:  parser: parse error at or near "GROUP"


Thanks.....

Arcadius.