Different Execution Time For Same Query - SQL Server?

Jan 28, 2011

I have a query:

Select a from tbl_abc where id in ( select id from tbl_xyz where mainid = 12)

When I am executing this query, it is taking 1-2 seconds to execute, but when I am using the same query in stored procedure, the below query is taking more than 5 minute:

If(Select a from tbl_abc where id in ( select id from tbl_xyz where mainid = 12))
BEGIN
-- CREATE TEMPORARY TABLE [Say: #temp1]
#temp1 => Select a from tbl_abc where id in ( select id from tbl_xyz where mainid = 12)
inserting the same value in the temp table
drop #temp1
END

what could be the reason of this? and how can I resolve this? I am running the SP from asp.net

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