On Feb 29, 2008, at 5:10 PM, Uwe Grauer wrote:
> Maybe it helps to read another explanation.
> This was a reply from the firebird-support group:
> http://tech.groups.yahoo.com/group/firebird-support/message/92493?l=1
No, since they're saying the same thing. Actually, this explanation
is worse, since it says that Firebird uses the 'as' expression as an
identifier, and not a column alias. If they can use it in a GROUP BY
to refer back to the original expression, there is no reason (other
than they didn't implement it) that they couldn't provide the exact
same behavior in HAVING.
If you cannot use the names of derived columns in a HAVING, then what
is the difference between HAVING and WHERE?
-- Ed Leafe
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