| From: | "Christian Kindler" <christian(dot)kindler(at)gmx(dot)net> |
|---|---|
| To: | Andrew Kroeger <andrew(at)sprocks(dot)gotdns(dot)com>, ksimpson(at)mailchannels(dot)com |
| Cc: | pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: Comparing two slices within one table efficiently |
| Date: | 2007-08-13 19:34:27 |
| Message-ID: | 20070813193427.76840@gmx.net |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-sql |
Yes and you could make it even more speedy with the use table partitioning.
http://www.postgresql.org/docs/8.1/interactive/ddl-partitioning.html
> select
> t1.domain_id as domain_id,
> t1.mta_id as mta_id,
> t1.run_id as run_id_1,
> t1.attribute1 as attribute1_1,
> t1.attribute2 as attribute2_1,
> t2.run_id as run_id_2,
> t2.attribute1 as attribute1_2,
> t2.attribute2 as attribute2_2
> from
> t t1
> join t t2 on
> t1.mta_id = t2.mta_id and
> t1.domain_id = t2.domain_id and
> (t1.attribute1 != t2.attribute1 or t1.attribute2 != t2.attribute2)
--
cu
Chris
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