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Posted by MC on 01/29/07 19:30
Well, why dont you check execution plan for both queries? If thats the same,
the performance should be the same. Also, if you need more help, generate
some real sample here. Select * and no table schema/data doesnt help.
MC
"Don Vaillancourt" <donv@webimpact.com> wrote in message
news:hYpvh.49785$43.43940@nnrp.ca.mci.com!nnrp1.uunet.ca...
> Here's an oversimplified version of a query that I'm writing and wanted to
> know if there are any performance differences between the two versions.
>
>
> select *
> from table_a a , table_b b
> where a.col_1 = b.col_1
> and a.col_1 = 1000
>
>
> versus
>
>
> select *
> from table_a a , table_b b
> where a.col_1 = 1000
> and b.col_1 = 1000
>
> All the tests show that they run at the same speed. But I have a very
> large query that joins 5 tables together and I'm trying to get as much out
> of it as possible. Currently it runs at 2 seconds which I really don't
> like and would like to get it at under 1 second. So I'm looking for every
> little bit.
>
> I've already removed the DISTINCT, which in my test case doesn't do
> anything, but still took up one second.
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