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stupid SQL question on Where clause

Is there any difference in the order of parameters in the where clause?
Does it add any speed to declare the least refined first or last?

Jul 23 '05 #1
3 1071
(sm***********@yahoo.com) writes:
Is there any difference in the order of parameters in the where clause?
Does it add any speed to declare the least refined first or last?


No.
--
Erland Sommarskog, SQL Server MVP, es****@sommarskog.se

Books Online for SQL Server SP3 at
http://www.microsoft.com/sql/techinf...2000/books.asp
Jul 23 '05 #2


sm***********@yahoo.com wrote:
Is there any difference in the order of parameters in the where clause?
Does it add any speed to declare the least refined first or last?

yes, it does...
I have seen it performing well when u make the condition
that filter the most records first.

Jul 23 '05 #3
No, the optimizer gets to re-order the predicates as it sees fit. The
*kind* of predicates and the statistics is important, however.

Jul 23 '05 #4

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