RE: SQL date comparison - a better way?

[rob@xxxxxxxxx]

Good idea Scott.  And, providing your applications do not directly access 
the physical file, but only access the logical files, you could add fields 
without any level checks.

I've seen this technique used by a software vendor.

Instead of selecting all fields in their logical files they only selected 
the fields previously used in that logical file.  To change from an 6 
digit date to either an 8 digit date, or a true date field, then the field 
in the logical file could do one of two things:
1)  Be mapped over a conversion of this field back to 6 digit, via a UDF 
or some other technique.  In this case your physical would only have one 
date field.
2)  Have a trigger program update the 6 digit date field every time the 
true date field was manipulated.  In this case your physical would have 
two date fields, kept in sync.


Rob Berendt
-- 
"They that can give up essential liberty to obtain a little temporary 
safety deserve neither liberty nor safety." 
Benjamin Franklin 





"Scott Johnson" <sjohnson@xxxxxxxxxxxxx>
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08/12/2003 03:02 PM
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Get with at least the 90's and update the fields to Date Data Types.

;-)  Just couldn't resist.

What you have looks good for what you need to do.  Do you really have 
dates before 1940?  If not you could get rid of that part.
Like somebody else suggested, you may want to look into user defined 
functions. Just depends how often you plan on running this
statement.

-- Scott

>

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