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 better performance - NOT in or Join
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Posting Yak Master

135 Posts

Posted - 10/09/2012 :  05:34:49  Show Profile  Reply with Quote

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?

Posting Yak Master

190 Posts

Posted - 10/09/2012 :  05:41:30  Show Profile  Visit sql-programmers's Homepage  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

Edited by - sql-programmers on 10/09/2012 05:43:44
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Very Important crosS Applying yaK Herder

52326 Posts

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

SQL Server MVP

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