SQL JOIN instead NOT IN

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February 18th, 2004, 11:26 AM

dadelcas

Contributing User

Join Date: Jul 2003

Location: Venezuela

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SQL JOIN instead NOT IN

Hello people...

I want to do the following query:

SELECT * FROM tableA WHERE tableA.tableBKey NOT IN (SELECT tableBKey FROM tableB WHERE fieldB1='something');

but I need to do it with out the use of NOT IN for performance reasons. How can I do that? Maybe using joins...

Thanks in advance...

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-DdC

February 18th, 2004, 11:46 AM

r937

SQL Consultant

Join Date: Feb 2003

Location: Toronto Canada

Posts: 18,246

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there are two ways:

Code:

select * 
  from tableA 
 where not exists
       ( select 1 
           from tableB
          where tableBKey = tableA.tableBKey 
            and fieldB1 = 'something' )

Code:

select tableA.* 
  from tableA 
left outer
  join tableB
    on tableA.tableBKey = tableB.tableBKey 
   and                    tableB.fieldB1 = 'something'
 where tableB.tableBKey is null

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