Groups > comp.databases.ms-sqlserver > #704

Re: SQL help again

From	"Bob Barrows" <reb01501@NOSPAMyahoo.com>
Newsgroups	comp.databases.ms-sqlserver, microsoft.public.sqlserver.programming
Subject	Re: SQL help again
Date	2011-10-02 13:06 -0400
Organization	A noiseless patient Spider
Message-ID	<j6a5n5$9d3$1@dont-email.me> (permalink)
References	<j6a2kf$3d5$1@speranza.aioe.org> <j6a4ks$9fp$1@speranza.aioe.org>

Cross-posted to 2 groups.

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Phil Hunt wrote:
> I tried
> CASE EventID when NULL then 1 else 0 end
>
> It always return 0, why ?
>
>
Because the way you have the statement structured is causing an equality 
comparison to be performed, the result of which will always be false. You 
have to structure it like:

CASE when  EventID IS NULL then 1 else 0 end

To answer your original question, you can subtract the result of 
count(distinct column_name) from count(*):

select count(*) - count(distinct eventid) as null_eventids

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Thread

SQL help again "Phil Hunt" <aaa@aaa.com> - 2011-10-02 12:14 -0400
  Re: SQL help again "Phil Hunt" <aaa@aaa.com> - 2011-10-02 12:48 -0400
    Re: SQL help again "Bob Barrows" <reb01501@NOSPAMyahoo.com> - 2011-10-02 13:06 -0400
      Re: SQL help again "phil hunt" <a@abc.com> - 2011-10-02 18:44 -0400
      Re: SQL help again "Bob Barrows" <reb01501@NOyahooSPAM.com> - 2011-10-03 12:09 -0400
  Re: SQL help again --CELKO-- <jcelko212@earthlink.net> - 2011-10-03 08:55 -0700

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