From: | "Dave [Hawk-Systems]" <dave(at)hawk-systems(dot)com> |
---|---|
To: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: highest match in group |
Date: | 2003-12-10 20:36:33 |
Message-ID: | DBEIKNMKGOBGNDHAAKGNKELCHNAC.dave@hawk-systems.com |
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Lists: | pgsql-general |
>"Dave [Hawk-Systems]" <dave(at)hawk-systems(dot)com> writes:
>> have a data table that records entries by date(unix timestamp) and customer
>> number. each custnum will have several entries showing a running
>ledger type
>> snapshot. we have the need to get the most recent entry from not
>one, but all
>> unique customers, in the most cost effective manner.
>
>If you don't mind using a Postgres-only construct, SELECT DISTINCT ON
>is made for this. See the "weather report" example in the SELECT
>reference page.
thanks Tom, had a forest for the trees problem there and that put me on the
right track.
Dave
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