Re: how do i avoid multiple sessions from inserting the

You might have duplicate john doeos with diffent ID's

2/24/2003 9:51:40 AM, Kolus Maximiliano <Kolus(dot)maximiliano(at)bcr(dot)com(dot)ar> wrote:

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> From: Kolus Maximiliano <Kolus(dot)maximiliano(at)bcr(dot)com(dot)ar>
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> To: patrick(dot)fiche(at)aqsacom(dot)com, pgsql-general(at)postgresql(dot)org
> Subject:Re: [GENERAL] how do i avoid multiple sessions from inserting the
> Date: Mon, 24 Feb 2003 14:51:40 -0300
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> > Why not something like that ?
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> > 2) IF NULL -> INSERT INTO users values (....'blah' ) WHERE NOT EXISTS
> ....
> > -> SELECT id FROM users WHERE email = 'blah'
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> I tried, but it's giving me an error, as if INSERT wouldn't like the WHERE:
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> INSERT INTO users (email) VALUES ('john(at)doe(dot)com')
> WHERE NOT EXISTS
> (SELECT id FROM users WHERE email='john(at)doe(dot)com');
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> ERROR: parser: parse error at or near "WHERE"
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> (Btw, i didnt know that INSERT would accept a WHERE clause)
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