Manfred,

> I'd be honestly interested in the circumstances where you made that
> observation.

Hmmmm ... one of my database involves a "crosstab" converstion where there 
were 13 possible values, and the converted table is heavily indexed.  For 
that case, I found using CASE statements to be slower.

For your example, how do the statistics change if you increase the number of 
levels to 15 and put an index on them?

-- 
-Josh Berkus
 Aglio Database Solutions
 San Francisco


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