How to convert query

Hi all,
how to convert the below query using EXISTS so tht i can give better performance
select count(distinct material_no) from ot_raw_demand_plan_stg stg
where material_no in (select distinct produced_part from ot_flat_bom bom)

One alternative which might give you better performance:
 
select count(distinct material_no) from ot_raw_demand_plan_stg stg 
where exists (select 1 from ot_flat_bom bom where bom.produced_part = stg.material_no)
 
Also, make sure that your tables are properly analyzed and use EXPLAIN PLAN to compare execution plans.

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Dear GURU'S
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============================================
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Hi all expert,
How to make a request how to add table "QTYSALES one month yesterday"
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SET ARITHABORT OFF
SET ANSI_WARNINGS OFF
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FROM DBO.OITM T1
WHERE T1.ITEMCODE NOT IN (SELECT ISNULL(ITEMCODE,0) FROM INV1)
GROUP BY T1.ItemCode,T1.itemname,T1.OnHand
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Edited by: rachelhel on May 20, 2009 8:06 AM

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