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By any chance can we able to optimize the below query.. It is running for long time..

Posted By:      Posted Date: October 05, 2010    Points: 0   Category :Sql Server

By any chance, can we optimize the below query..This is running for 2 hrs..As of now, i really don't have any execution plans. 

If i replace "IN" with "Exists", i am saving few minutes. Can someone please optimize the query little more?
SELECT pm.pm_no,
eam_od_pm_tb pm, 
eam_od_location_tb loc
pm.site_id in ('ALF','BRF', 'COF','CUF','GAF','JOF','JSF','KIF','SHF','WCF', 

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