From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Jean-Luc Lachance <jllachan@nsd.ca>
Cc: Richard Huxton <dev@archonet.com>
Cc: pgsql-sql <pgsql-sql@postgresql.org>
Subject: Re: Rules/Trigges Trade-offs
Date: Fri, 6 Dec 2002 12:41:07 -0500 (EST)
Message-ID: <200212061741.gB6Hf7121431@candle.pha.pa.us> (raw)
In-Reply-To: <3DF0DEA7.14D89064@nsd.ca>
No, the rule will affect all the rows using one query.
---------------------------------------------------------------------------
Jean-Luc Lachance wrote:
> Thanks for the info.
>
> Do you mean that if an update affects more than one row I should use
> triggers because the rules will be executed only once?
>
> JLL
>
>
> Richard Huxton wrote:
> >
> > On Friday 06 Dec 2002 4:03 pm, Jean-Luc Lachance wrote:
> > > Hi all!
> > >
> > > Is there a guideline on the use of rules compared to triggers when both
> > > can be use to achieve the same result?
> >
> > If I can use rules I do. Rules rewrite the query so are processed once,
> > whereas triggers get processed for every row.
> > --
> > Richard Huxton
>
> ---------------------------(end of broadcast)---------------------------
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>
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>
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 359-1001
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To: pgsql-sql@postgresql.org
Cc: pgman@candle.pha.pa.us, jllachan@nsd.ca, dev@archonet.com
Subject: Re: Rules/Trigges Trade-offs
In-Reply-To: <200212061741.gB6Hf7121431@candle.pha.pa.us>
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