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9.7

1 record from each group - summary - remove duplicates

Asked by SweatCoder in MS SQL Server

I have a stored procedure that yields a resultset as shown below. I need to know how to write the query so that I only get one record per CustID, based on the latest AddressCreate date AND PhoneCreate date. Here's the original query:

SELECT DISTINCT top 100 m.CustID, a.dtStamp AS AddressCreate, p.dtStamp AS PhoneCreate, m.FirstName, m.LastName
FROM Member m
JOIN Address a (nolock)
ON m.CustID = a.CustID
JOIN Phone p (nolock)
ON m.CustID = p.CustID
WHERE m.LastName = 'Foo'
AND m.Active = 1
AND m.[Primary] = 1
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CustID	AdddressCreate	PhoneCreate	FN	LN
==========================================================
09136713	2005-04-30 22:55	2005-04-30 22:24	Adam     Foo
09136713	2005-05-30 22:55	2005-07-07 10:54	Adam     Foo
08811811	2005-06-25 02:34	2005-06-25 02:34	Bill	Foo
08811811	2005-07-25 02:34	2005-04-30 22:34	Bill	Foo
 
But what I would *like* returned is this:
 
CustID	AdddressCreate	PhoneCreate	FN	LN
==========================================================
09136713	2005-05-30 22:55	2005-07-07 10:54	Adam     Foo
08811811	2005-07-25 02:34	2005-04-30 22:34	Bill	Foo
 
Notice that the records are now unique relative to CustID, 
and that the records with older AddressCreate dates were 
eliminated. Since the query joines Member, Address and Phone 
tables, I need the summary record to contain the latest 
address AND the latest phone (based on each table's 
dtstamp column)--and to have unique CustIDs.
[+][-]03/14/08 04:12 PM, ID: 21130434Accepted Solution

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About this solution

Zone: MS SQL Server
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Solution Provided By: BriCrowe
Participating Experts: 2
Solution Grade: A
 
[+][-]03/14/08 03:36 PM, ID: 21130203Expert Comment

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[+][-]03/14/08 04:11 PM, ID: 21130428Expert Comment

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[+][-]03/14/08 04:11 PM, ID: 21130431Expert Comment

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[+][-]03/15/08 08:53 PM, ID: 21135550Author Comment

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