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Re: [HACKERS] Oops, I seem to have changed UNION's behavior - Mailing list pgsql-hackers

From	Thomas Lockhart
Subject	Re: [HACKERS] Oops, I seem to have changed UNION's behavior
Date	May 9, 1999 11:04:35
Msg-id	[email protected] Whole thread Raw
In response to	Re: [HACKERS] Oops, I seem to have changed UNION's behavior (Bruce Momjian <[email protected]>)
Responses	Re: [HACKERS] Oops, I seem to have changed UNION's behavior Re: [HACKERS] Oops, I seem to have changed UNION's behavior
List	pgsql-hackers

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> > Am I right in thinking that UNION (without ALL) is defined to do a
> > DISTINCT on its result, so that duplicates are removed even if the
> > duplicates both came from the same source table?  That's what 6.4.2
> > does, but I do not know if it's strictly kosher according to the SQL
> > spec.

(Just in case this is still active)

Yes, this is the right behavior according to SQL92...
                        - Thomas

-- 
Thomas Lockhart                [email protected]
South Pasadena, California

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From: Bruce Momjian
Date: 09 May 1999, 10:57:35
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Date: 09 May 1999, 11:23:55
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Re: [HACKERS] Oops, I seem to have changed UNION's behavior - Mailing list pgsql-hackers

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