Congratulations PostgreSQL-Team for your work!
with the current 8.4 B1 Version of PostgreSQL the bad execution time
of my example-Query containing a NOT EXISTS
changed from "aborted after hours" to just 5 seconds - double as quick
as my result with MS-SQL.
That's wonderful!
> insert into t1
> select distinct (t1.a + t2.a)*2
> from t1,t2
> where not exists (
> select * from t1 tt where tt.a =3D (t1.a + t2.a)*2
> )
I assume there is now a hashed ANTI-SEMI-JOIN operator implemented?
Thanks
Alexander
--=20
Dipl.-Math. Alexander Steffens
Dorotheenstr. 16
23564 L=C3=BCbeck