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 If exists statement performance
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Yak Posting Veteran

57 Posts

Posted - 05/15/2013 :  15:52:14  Show Profile  Reply with Quote
Here's the if exists statement i wrote in a stored procedure, Is this efficient? Is there are a better way so there is not much of a delay? Any suggestions are appreciated.

If Exists (select * from products where product_id = @id and prod_cd in (select prod_cd from prod where prod_type = 'toys' and prod_Active = 'Y')and prod_state = 'Y')
update CUSTOMER set FLAG = 'Y',DATE = GETDATE() where product_id = @id and EMAIL_ADDRESS = @EMAIL
update CUSTOMER set FLAG = 'N',DATE = GETDATE() where product_id = @id and EMAIL_ADDRESS = @EMAIL

Bustaz Kool
Flowing Fount of Yak Knowledge

1834 Posts

Posted - 05/15/2013 :  17:58:44  Show Profile  Reply with Quote
Have you looked at the execution plan to see where the time is being spent and what indexes are being used?

I am not one of those who in expressing opinions confine themselves to facts. (Mark Twain)
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Very Important crosS Applying yaK Herder

52326 Posts

Posted - 05/16/2013 :  00:24:08  Show Profile  Reply with Quote
i would have replaced in with join or using EXISTS

SQL Server MVP
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