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Message Posted: Wed, 19 Aug 2009 @ 12:33:39 GMT
| Subj: | | Re: 7453: interval field overflow. |
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| 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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