How to get the first rows of a relational table (depending of the last date of change)

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Hi all,
I want to fill a grid (no hirarchical) where to combine customer data and the last selling item of each customer in a row (getting only the last sellings depending on sells_date).
My idea was

SELECT C.id,C.customerdata,S.id,S.sellsdata FROM dbo.customer AS C LEFT OUTER JOIN (SELECT TOP 1 id,sellsdata FROM dbo.sells ORDER BY sells_date DESC) AS S ON C.id=S.id<br />

Whith this string I get only one selling item and not one item for each.
How does the correct SQL-String look likes ?

tnx in advance
Frank

Posted 16-Jul-08 1:51am

fracalifa

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leoinfo · Answer 1 · 2008-07-16T04:29:00

You should ALWAYS provide the actual fields for each table to avoid misunderstandings.

This should solve the problem...

;WITH LatestSells AS (<br />	SELECT s1.* <br />	FROM dbo.Sells AS s1<br />	INNER JOIN (<br />		SELECT DISTINCT Customer_ID<br />			, (	SELECT TOP 1 Sell_ID <br />				FROM dbo.Sells <br />				WHERE Customer_ID = sx.Customer_ID <br />				ORDER BY Sell_Date DESC <br />			  ) AS Sell_ID<br />		FROM dbo.Sells AS sx<br />	) AS s2 ON s1.Customer_ID = s2.Customer_ID AND s1.Sell_ID = s2.Sell_ID<br />)<br />SELECT c.*, s.*<br />FROM  dbo.Customers			AS c<br />LEFT OUTER JOIN LatestSells AS s<br />ON c.Customer_ID = s.Customer_ID<br />