Re: [HACKERS] Re: [SQL] DISTINCT ON: speak now or forever hold your peace

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От Bruce Momjian
Тема Re: [HACKERS] Re: [SQL] DISTINCT ON: speak now or forever hold your peace
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Msg-id 200001262316.SAA29624@candle.pha.pa.us
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Ответ на Re: [HACKERS] Re: [SQL] DISTINCT ON: speak now or forever hold your peace  (Tom Lane <tgl@sss.pgh.pa.us>)
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> Chris Bitmead <chris@bitmead.com> writes:
> > As long as we're fixing the syntax, I'm wondering if it wouldn't be more
> > logical to have DISTINCT ON somewhere later in the syntax.
> 
> Well, SELECT DISTINCT is that way because SQL92 says so.  Putting the
> DISTINCT ON variant somewhere else might be logically purer, but I think
> it'd be confusing.
> 
> Also, isn't the reason we have DISTINCT ON at all that it's there to
> be compatible with MySQL or someone?  I figured adding parens would be
> about the least-surprising variant syntax for a person used to those
> other products.
> 

Makes sense to me.

--  Bruce Momjian                        |  http://www.op.net/~candle pgman@candle.pha.pa.us               |  (610)
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