Groups > comp.databases.ms-sqlserver > #1245

Re: what's going on with datediff function?

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From	"Bob Barrows" <reb01501@NOyahooSPAM.com>
Newsgroups	comp.databases.ms-sqlserver
Subject	Re: what's going on with datediff function?
Date	Tue, 4 Sep 2012 11:25:17 -0400
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justaguy wrote:
> -- task: find records / rows where createddate is 8/23/2012
>
> select *
> from myTBL
> and datediff(dy,createddate,'8/23/2012') <1
>
> -- change parameter from dy to d does not help neither
> What's wrong?
>
> DBMS in question: MS SQL Server 2005 Express
>
> tia

Why not simply
WHERE CreatedDate='20120823'
?

If times are being stored in CreatedDate, then it would be:

WHERE CreatedDate >= '20120823' and CreatedDate < '20120824'

These solutions both allow an index on CreatedDate to be used. Your datediff
solution forces a table scan.

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Thread

what's going on with datediff function? justaguy <lichunshen84@gmail.com> - 2012-08-30 12:34 -0700
  Re: what's going on with datediff function? Gene Wirchenko <genew@ocis.net> - 2012-08-30 14:04 -0700
  Re: what's going on with datediff function? "Bob Barrows" <reb01501@NOyahooSPAM.com> - 2012-09-04 11:25 -0400
    Re: what's going on with datediff function? "Bob Barrows" <reb01501@NOSPAMyahoo.com> - 2012-09-05 18:47 -0400
      Re: what's going on with datediff function? rja.carnegie@gmail.com - 2012-09-06 15:53 -0700
        Re: what's going on with datediff function? "Bob Barrows" <reb01501@NOSPAMyahoo.com> - 2012-09-06 19:03 -0400
        Re: what's going on with datediff function? "Bob Barrows" <reb01501@NOSPAMyahoo.com> - 2012-09-06 19:09 -0400
          Re: what's going on with datediff function? Gene Wirchenko <genew@ocis.net> - 2012-09-06 17:20 -0700
    Re: what's going on with datediff function? "Bob Barrows" <reb01501@NOSPAMyahoo.com> - 2012-09-05 18:47 -0400
  Re: what's going on with datediff function? Lutz Uhlmann <news@invalid.invalid> - 2012-09-05 08:22 +0200

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