From: | Josh Berkus <josh(at)agliodbs(dot)com> |
---|---|
To: | Greg Spiegelberg <gspiegelberg(at)gmail(dot)com> |
Cc: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Can WINDOW be used? |
Date: | 2010-08-13 21:17:02 |
Message-ID: | 4C65B64E.9070005@agliodbs.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-performance |
> wxd0812=# EXPLAIN ANALYZE
> wxd0812-# SELECT * FROM
> wxd0812-# (SELECT DISTINCT ON (key1_id,key2_id) * FROM sid120.data
> ORDER BY key1_id,key2_id,time_id DESC) x
> wxd0812-# WHERE NOT deleted;
SELECT * FROM (
SELECT data.*,
rank() as rank over
( partition by key1_id, key2_id order by time_id DESC )
FROM data
) as rankings
WHERE rank = 1 AND NOT deleted;
--
-- Josh Berkus
PostgreSQL Experts Inc.
http://www.pgexperts.com
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