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Re: Celko: help with an experiment

From: --CELKO-- <71062.1056_at_compuserve.com>
Date: 12 Jul 2002 12:40:25 -0700
Message-ID: <c0d87ec0.0207121140.c5e9787@posting.google.com> 





>> see if the following functions both return the same value:




   sum(1) and count(*)



For various kinds of selection criteria. <<



That one is easy.  If the table is not empty (NULLs will not matter),
you get the same answer.  If the table is empty, then SUM(1) returns
NULL and COUNT(*) returns 0.



It is another verison of this "set as a completed whole" versus "set
as a collection of things" problem.
Received on Fri Jul 12 2002 - 14:40:25 CDT












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