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Lately, the question has arisen of why, in some SQL queries using UNION,
the UNION, by itself, adds more processing time than the combined total
of the component queries (i.e., adding 10 seconds to UNION together 4-5
queries that individually give sub-second responses), while in other
cases, UNIONing together a bunch of component queries has no noticeable
effect on response time.
Can anybody shed any light on this?
I have a vague recollection of an Access tool for examining and
optimizing SQL queries (running them, as I recall, in the debugger, and
then digesting the messages into a graphic representation and
suggestions for optimization), but I haven't used it (or even seen it in
use) in a decade and a half.
--
JHHL
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