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Re: Limit for looping ANDs to a query
Posted by: Peter Zaitsev
Date: February 04, 2005 12:02PM

Hm,

It does not make much sense in the form you have described it

field=Const1 and field=Const2 is always false if Const1!=Const2 :)

If you mean different fields there are a lot of questions to ask - are you going to index anything ? How large is the table, what is the chance of having clause matched

It should affect query parsing as well as CPU portion of execution at some extent -
if first clause is false MySQL will not evaluate second.

This is the case when having simple benchmark is easier and gives more accurate results than looking for theoretical answer :)

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