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Harry C
Posting Yak Master
148 Posts |
 Posted - 2009-08-20 : 13:04:03
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| Can someone help me rewrite this using EXISTSFROM MyViewWHERE aid in (SELECT aid FROM dbo.GetList(@UserID))The IN statement works fine, but takes a very long time. I am hoping that exists will provide some increased benefit, but cannot figure out the query. Thanks |
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webfred
Master Smack Fu Yak Hacker
8781 Posts |
Posted - 2009-08-20 : 13:08:44
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Yes - IN (...) is very slow if there are many rows to read.FROM MyView mvWHERE EXISTS (select * from dbo.GetList(@UserID) where aid = mv.aid)But maybe this is also slow because using functions is often slowing down the queries.Test it.
No, you're never too old to Yak'n'Roll if you're too young to die. |
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Harry C
Posting Yak Master
148 Posts |
Posted - 2009-08-20 : 13:13:30
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| Thanks, I just figured it out and was testing it. It is way faster. 43 seconds for 470 records with IN vs 9 seconds with EXISTS. Much better. I am recoding a legacy system in .NET and trying to use the existing SQL as much as I can. But it may be better to pass in a Comma List of aid vs getting them from the the function. We'll see. Thanks!HC |
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webfred
Master Smack Fu Yak Hacker
8781 Posts |
Posted - 2009-08-20 : 13:18:30
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welcome 
No, you're never too old to Yak'n'Roll if you're too young to die. |
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EXISTS vs IN