From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | taral(at)mail(dot)utexas(dot)edu (Taral) |
Cc: | jwieck(at)debis(dot)com, hackers(at)postgreSQL(dot)org |
Subject: | Re: [HACKERS] RE: [GENERAL] Long update query ? (also Re: [GENERAL] CNF vs. DNF) |
Date: | 1998-10-03 03:01:07 |
Message-ID: | 199810030301.XAA01160@candle.pha.pa.us |
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Lists: | pgsql-general pgsql-hackers |
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> > How do we do that with UNION, and return the right rows. Seems the
> > _join_ happending multiple times would be much worse than the factoring.
>
> Ok... We have two problems:
>
> 1) DNF for unjoined queries.
> 2) Factorization for the rest.
>
> I have some solutions for (1). Not for (2). Remember that unjoined queries
> are quite common. :)
>
> For (1), we can always try to parallel the multiple queries... especially in
> the case where a sequential search is required.
I don't know how to return the proper rows with UNION.
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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