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How to rewrite a query to find records that exist on 1 table and not on another table ?

Posted on 2007-07-31
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Last Modified: 2010-03-20
I am developing an application in Access using Access as the front end and SQL Server as the back end
database.

The following query tells me the number of records where the CustomerNumber + OfficeNumber match
between 2 tables named tblCustomers and tblProducts:


select count(*)
FROM tblCustomersNew As C inner JOIN tblProductsNew As P
ON C.CustomerNumber=P.CustomerNumber AND C.OfficeNumber=P.OfficeNumber

Could you tell me how to rewrite this query to find any record(s) on the
tblProductsNew table and not on the tblCustomersNew table ?
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Question by:zimmer9
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Rurne earned 2000 total points
ID: 19605308
Use an outer join, then check for empty halves the outer join:

select count(*)
FROM tblCustomersNew As C RIGHT JOIN tblProductsNew As P
ON C.CustomerNumber=P.CustomerNumber AND C.OfficeNumber=P.OfficeNumber WHERE C.CustomerNumber IS NULL;
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