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 better performance - NOT in or Join		  New Topic  Reply to Topic
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subhaoviya
Posting Yak Master

India
119 Posts
Posted - 10/09/2012 :  05:34:49  Show Profile  Reply with Quote
Hi,

I am having query

SELECT * from Table1 where ID not in
(SELECT ID from Table2)

which have million of records Table1 and thousands of records in Table2.

for executing this query it taken more than 10 min

How to fast it up?

sql-programmers
Posting Yak Master

USA
189 Posts
Posted - 10/09/2012 :  05:41:30  Show Profile  Reply with Quote
Please try this and update I hope which will help you.

SELECT * from Table1
LEFT JOIN Table2 ON Table2.ID = Table1.ID
Where Table2.ID IS NULL

I think, JOIN will be better than NOT IN.

SQL Server Programmers and Consultants
http://www.sql-programmers.com/
Edited by - sql-programmers on 10/09/2012 05:43:44
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visakh16
Very Important crosS Applying yaK Herder

India
47154 Posts
Posted - 10/09/2012 :  23:12:33  Show Profile  Reply with Quote
what all indexes you've on table?

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
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