Roy> I don't have a copy of the spec, but according to "A guide to
Roy> the SQL standard" conversions like this that would discard
Roy> data are supposed to raise an exception.
Just to clarify, my understanding is that in ANSI SQL it is valid to
convert from the data type INTERVAL YEAR TO MONTH to the data type
INTERVAL YEAR, but the conversion should raise an exception if the
value is not an integral number of years...
-roy
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