RE: SQL Date Math -- MIDRANGE-L

create function CvtDateToNumISO(indte date) returns numeric(8,0)
language SQL
not fenced
deterministic no external action
specific CvtDateToNumISO
returns null on null input
contains SQL
set option datfmt=*ISO
begin
return( ( year(inDte) * 10000) +
( month(inDte) * 100) +
( day(inDte) ) );
end;

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Michael Ryan
Sent: Tuesday, November 13, 2007 1:19 PM
To: Midrange Systems Technical Discussion
Subject: Re: SQL Date Math

Got a convertDateToNum UDF lying around? And then of course
I'd have to dig out how to do a UDF...did it once IIRC.

On Nov 13, 2007 1:14 PM, Wilt, Charles <WiltC@xxxxxxxxxx> wrote:

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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