From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | mirekb(at)tcs(dot)uni(dot)wroc(dot)pl (Mirek Budzanowski) |
Cc: | pgsql-sql(at)postgreSQL(dot)org |
Subject: | Re: [SQL] How to Make Case InSensitive??? |
Date: | 1998-09-22 16:47:49 |
Message-ID: | 199809221647.MAA17617@candle.pha.pa.us |
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Thread: | |
Lists: | pgsql-sql |
[Charset ISO-8859-2 unsupported, filtering to ASCII...]
>
> > > I working with a table of about 70'000 records and I made 2 tests about
> > > the optimisation of ~* :
> > >
> > > With ~* :
>
> > > real 11.52 *
> > > user 0.02
> > > sys 0.01
> > >
> > > With upper(...) and like upper(%...%)
> > > --------------------------------------
>
> > > real 4.44 *
> > > user 0.03
> > > sys 0.00
> > >
> > > Relsult: it seem to be 2.6 time more optimised to use upper(...) like
> > > upper('%...%') ???
>
> > This is interesting. Does anyone have an idea why this is happening?
>
> In my opinion the reason why regular expresion matching is sloer is
> obvious. Regulars expresion are very powerfull, but the code that
> does the matching is a bit more complicated. With like expresions
> you may write simple and faster code.
Makes sense.
--
Bruce Momjian | 830 Blythe Avenue
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