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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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