Re: [GENERAL] Subject: String Concatenation DOES work.

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От Bruce Momjian
Тема Re: [GENERAL] Subject: String Concatenation DOES work.
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Msg-id 199901071728.MAA06751@candle.pha.pa.us
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Ответ на [GENERAL] Subject: String Concatenation DOES work.  (Holger Klawitter <holger.klawitter@gmx.de>)
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> > >I tried to place a query like "SELECT * FROM x WHERE a = b || c" where
> >
> > Well in version 6.4 this works:
> >   SELECT * FROM x WHERE a = b or a=c;
>
> Ahem, in PostQuel the || Operator stands for string concatenation not
> for the logical or. Anyhow, I found out that under 6.4.2 the following
> construct seems to work, however, all brackets are neccessary:
>     SELECT * from x WHERE a ~~ (( '%' || b ) || '%' );

|| is the SQL standard way to do it.  I realize it seems confusing.

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