troubleshooting Question

optimizing a sql server query

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aturetsky asked on
Microsoft SQL Server 2005SQL
10 Comments5 Solutions289 ViewsLast Modified:
I have a table called customer_access that keeps track of what users have access to what customer.
I need to get a list of customer_access records that would give me the list of records where the approval_date is the latest for each of the user-customer combinations.

Currently, I am doing it this way, but I have a feeling that it can be done more elegantly.  I am looking to improve the clarity of the sql w/o hurting the performance (or, ideally, improving performance as well).

select * from (select row_number() over (partition by ca.customerId, ca.userId ORDER BY ca.approvalDate DESC) as rownumber, from customer_access ca) ca1 where ca1.rownumber = 1


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