The way I tried to resolve it is joining the table with MMDDYYYY date to a calendar file. The calendar file has dates in it multiple ways with indexes over each way.
Select data.* from
Calendar
Join data
On data.mmddyyyy = calendar.mmddyyyy
Where calendar.yyyymmdd between 20110101 and 20110430
It's seems to run pretty good.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Thursday, July 07, 2011 10:33 AM
To: Midrange Systems Technical Discussion
Subject: Re: SQL Date function question
Glad to hear you have it resolved.
One advantage to using something like Alan Campin's iDate (or your own
UDF) is that you can bury it into a view and not have to duplicate the
date conversion into every query. For example, if I do
CREATE VIEW ECHL97 AS (SELECT idate(hedte,*CYMD) as OrdDate, ...
Then in subsequent queries you can just shoot against that.
The only problem is that the sort/select performance isn't as good as
going against the raw date. You know, the old
select ... where hedte = ConvertDateToNumber(current date)
will outperform
select ... where ConvertNumberToDate(hedte) = current date
But your lousy MMDDCCYY stored date is pretty worthless for
sorting/selecting in any performance manner for any ranges. Oh, it may be
ok for one exact date but that's it.
Rob Berendt
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