From: Peter Galbavy <peter.galbavy@knowtion.net>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-sql@postgresql.org
Subject: Re: weighting (the results of) a query ?
Date: Tue, 7 Jan 2003 16:25:43 -0000
Message-ID: <023f01c2b669$6ce39270$4528a8c0@cblan.mblox.com> (raw)
References: <001301c2b4a6$f969b360$36bd10ac@walrus>
<021001c2b666$752c1d60$4528a8c0@cblan.mblox.com>
<13705.1041956070@sss.pgh.pa.us>
> Most likely you should write UNION ALL, not UNION. As given, the query
> will go through a pass of attempted duplicate-row-elimination, which is
> almost certainly not what you want.
Not sure - what I want is only one row per real row but ordered as per the
constants. When you say duplicate-row-elimination do you mean including the
'constant' weighting, in which case UNION ALL is probably right. At the
moment, the dataset returned appears correctly de-duplicated.
What I mean is when an image row has both 'eat static' in the caption and as
a keyword, I want it returned only once...
Peter
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Cc: peter.galbavy@knowtion.net, tgl@sss.pgh.pa.us
Subject: Re: weighting (the results of) a query ?
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