From: | "Fip" <Filippo(dot)Bernante(at)gmail(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | grouping excluding some text results |
Date: | 2006-10-26 07:25:58 |
Message-ID: | 1161847558.199150.294690@i3g2000cwc.googlegroups.com |
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Thread: | |
Lists: | pgsql-general |
Hi,
ho can I select some one restult for type, excluding the rest?
I have something like, as result of a join:
| ID | score | description |
-----------------------------------------------------------------
MG01 56 "textual description1..."
MG02 47 "another text ..."
MG02 55 "textual description, text...." <----
note this
MG02 55 "textual description, text...." <----
note this
MG01 35 "this is a different text...."
MG02 61 "random chars..."
(...)
I know that is possible selecting by grouping if I use an aggregate
function:
> select ID,max(score) by table group by ID
but I want the description too, only one description, and I have a very
large dataset, I cannot cycle with more subselections, this require too
much time; also I want to exclude duplicates: only one ID.
What can I do?
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