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At 14:27 11/11/2003, Rob Berendt wrote:
In some situations people have been able to cheat by using a
summary function like max(dbmdc#)
I haven't looked at this in several years, but do some testing before you
try that route. When last I looked, it was much more expensive (and slower)
to use a function like max() than to use group by. My assumption at the
time was that group by allows the query to use a bitmap to determine
cardinality, while a function like max() forces the system to build a
temporary access path for sequencing purposes. I have no idea if that's
correct, but for sure, do some benchmarks first, and make sure you're
working with realistic dataset sizes when you do.
Pete Hall
pbhall@xxxxxxxxxxxxx
http://www.pbhall.us/
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