From: Tom Lane <tgl@sss.pgh.pa.us>
To: Chris <dmagick@gmail.com>
Cc: Joshua D. Drake <jd@commandprompt.com>
Cc: marcosborges@mbsi.com.br
Cc: pgsql-performance@postgresql.org
Subject: Re: SQL_CALC_FOUND_ROWS in POSTGRESQL / Some one can
Date: Sun, 10 Dec 2006 23:57:18 -0500
Message-ID: <26692.1165813038@sss.pgh.pa.us> (raw)
In-Reply-To: <457CE03C.1060707@gmail.com>
References: <457814D3.1030001@mbsi.com.br>
<457CD182.7020004@gmail.com>
<1165809878.19970.2.camel@localhost.localdomain>
<457CE03C.1060707@gmail.com>
Chris <dmagick@gmail.com> writes:
> Their docs explain it:
> http://dev.mysql.com/doc/refman/4.1/en/information-functions.html
> See "FOUND_ROWS()"
Sounds like a pretty ugly crock ...
The functionality as described is to let you fetch only the first N
rows, and then still find out the total number of rows that could have
been returned. You can do that in Postgres with a cursor:
DECLARE c CURSOR FOR SELECT ... (no LIMIT here);
FETCH n FROM c;
MOVE FORWARD ALL IN c;
-- then figure the sum of the number of rows fetched and the
-- rows-moved count reported by MOVE
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, dmagick@gmail.com, jd@commandprompt.com, marcosborges@mbsi.com.br
Subject: Re: SQL_CALC_FOUND_ROWS in POSTGRESQL / Some one can
In-Reply-To: <26692.1165813038@sss.pgh.pa.us>
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