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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