Re: projection with nulls
From: paul c <toledobysea_at_ac.ooyah>
Date: Sun, 16 Mar 2008 23:48:57 GMT
Message-ID: <JliDj.91381$pM4.24100_at_pd7urf1no>
Date: Sun, 16 Mar 2008 23:48:57 GMT
Message-ID: <JliDj.91381$pM4.24100_at_pd7urf1no>
David Cressey wrote:
> ...
> I have always treated GROUP BY and SELECT DISTINCT as providing the
> functionality that's closest to projection.
>
> Some dialects of SQL will indeed eliminate the second tuple if GROUP BY or
> SELECT DISTINCT are used.
> ...
What is SQL's SELECT but projection? Received on Mon Mar 17 2008 - 00:48:57 CET