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From: Thomas Kellerer <spam_eater@gmx.net>
To: pgsql-performance@postgresql.org
Subject: Re: Performance issues
Date: Tue, 17 Mar 2015 15:19:10 +0100
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Tomas Vondra schrieb am 17.03.2015 um 14:55:
>  (2) using window functions, e.g. like this:
> 
>      SELECT * FROM (
>        SELECT *,
>             ROW_NUMBER() OVER (PARTITION BY touchpoint_execution_id
>                                ORDER BY FROM max_creation_dt) AS rn
>        FROM s_f_touchpoint_execution_status_history
>      ) foo WHERE rn = 1
> 
>      But estimating this is also rather difficult ...




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