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06.03.2008 at 05:25PM PDT, ID: 23455195
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9.4

Identify the matching record for the result of an aggregate function

Asked by schnellbd in SQL Server 2005, Databases Miscellaneous, MS SQL Server

Tags:

I have to join two tables and want to return the Minimum value of one of the matching records for a given field.  I need to then take the row that contains the minimum value in that field and display it (after joining it to another table).

For example I have three tables:

1)      Customers (CID, Name)
2)      Purchases (PID, CID, ProductID, DateCreated)
3)      Products (ProductID, Name)

I want to identify for each customer, the first time that they purchased a product (e.g. MIN(Purchases.DateCreated).  Then, based on this matching row, I want to determine the product name for that purchase.

The query I have is:

SELECT  Customers.CID, MIN(Purchases.DateCreated)
FROM   Customers
JOIN      Purchases
ON         Customers.CID = Purchases.CID
GROUP BY Customers.CID

What I do not know how to do is how to identify the Purchases.PID that matches the row that matches the MIN(Purchases.DateCreated) aggregate function.

For example, given the following dataset:

Customers
111   Joe Smith
222   John Sally
333   Steve Jones

Purchases
444   111   99   5/5/2008
555   111   97   5/3/2008
777   222   99   5/1/2008
888   333   98   4/27/2008

Products
97   Baseball
98   Basketball
99   Soccerball

The result would be
111   5/3/2008  Baseball
222   5/1/2008  Soccerball
333  4/27/2008  Basetball

Input is greatly appreciated.

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[+][-]06.03.2008 at 07:53PM PDT, ID: 21706450

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[+][-]06.03.2008 at 08:07PM PDT, ID: 21706538

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[+][-]06.03.2008 at 08:48PM PDT, ID: 21706788

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[+][-]06.03.2008 at 08:50PM PDT, ID: 21706803

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[+][-]06.03.2008 at 08:53PM PDT, ID: 21706812

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About this solution

Zones: SQL Server 2005, Databases Miscellaneous, MS SQL Server
Tags: SQL
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Solution Provided By: mark_wills
Participating Experts: 2
Solution Grade: A
 
 
[+][-]06.03.2008 at 09:01PM PDT, ID: 21706846

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[+][-]06.03.2008 at 09:07PM PDT, ID: 21706877

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