RE: SQL Date Math

["Wilt, Charles" <WiltC@xxxxxxxxxx>]

Then you're not using date fields <grin>

Eric already mentioned a UDF to convert the numeric value to a date value.

However, let me point out that by doing so, you'll force a table scan as any index over the numeric
field will not be used.

Your query would perform better by converting the current_date and (current_date - 30) into a numeric
value with a UDF.

Select *
from myfile
where myDateNum between convertDateToNum(current_date - 30 days) and ConvertDateToNum(current_date)

HTH,
Charles


> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx 
> [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Michael Ryan
> Sent: Tuesday, November 13, 2007 12:27 PM
> To: Midrange Systems Technical Discussion
> Subject: Re: SQL Date Math
>
> That's what I was looking for! Thanks Alan...
>
> Hmmm...also...what if mydate is 8.0 numeric in the form of ccyymmdd?
>
> On Nov 13, 2007 12:24 PM, Alan Shore <AlanShore@xxxxxxxx> wrote:
> > OR
> >
> > try
> > mydate between current_date and current_date - 30 day
> >
> >
> >
> > Alan Shore
> >
> > NBTY, Inc
> > (631) 244-2000 ext. 5019
> > AShore@xxxxxxxx
> > "If you're going through Hell, keep going" - Winston Churchill
> >
> >
> >
> >              "Michael Ryan"
> >              <michaelrtr@gmail
> >              .com>                                          
>             To
> >              Sent by:                  "Midrange Systems Technical
> >              midrange-l-bounce         Discussion"
> >              s@xxxxxxxxxxxx            <MIDRANGE-l@xxxxxxxxxxxx>
> >                                                             
>             
> > cc
> >
> >              11/13/2007 12:19                               
>        Subject
> >              PM                        SQL Date Math
> >
> >
> >              Please respond to
> >              Midrange Systems
> >                  Technical
> >                 Discussion
> >              <midrange-l@midra
> >                  nge.com>
> >
> >
> >
> >
> >
> >
> >
> > Bah...this is eluding me. I want to select records from a 
> file where a 
> > date value is between current date and 30 days ago. I 
> thought I could 
> > do something like:
> > mydate between current_date and current_date - 30, but that doesn't 
> > seem to work. Gotta be easy...how do I do it? Thanks!
> >
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