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Message Posted: Wed, 19 Aug 2009 @ 12:33:39 GMT


     
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Subj:   Re: 7453: interval field overflow.
 
From:   Geoffrey Rommel

The SQL manuals explain all this in detail, but here are the key points. Date1 - date2 returns an INTEGER (the number of days between the two dates). Between '0001-01-01' and '9999-12-31' there are fewer than 4 million days, so an integer will handle any possible difference.

However, this expression:

     (DATE - DATE '2008-07-01') DAY

returns an INTERVAL DAY. The fields within an interval are smallints, so they cannot be more than 32767; moreover, the ANSI standard (?) limits the interval fields to 4 digits (PIC 9999, you might say). Hence any difference over 9999 days will give a 7453 error.



     
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