Your tips were great and I have hunted down the relevant pages in the
docs. Thanks guys!
--
Amos
On 24-Mar-06, at 4:20 PM, Rod Taylor wrote:
On Fri, 2006-03-24 at 16:20 -0500, Tom Lane wrote:
Rod Taylor <[EMAIL PROTECTED]> writes:
The reason for the subselect is to prevent multiple calculations of
individual column aggregates. I believe it *may* be calculated
multiple
times otherwise this would work just as well:
select case when max(a) > max(b) then max(a) else max(b) end as
max from
tab;
Just for the record, we've gotten that right since 7.4. greatest()
would be a notationally cleaner solution than CASE, but multiple
occurrences of identical aggregates don't cost much of anything.
Thanks. I could not remember one way or the other.
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