I'm having a bit of difficulty getting the results I need from our database.
In a nutshell I'm trying to work out trends in what people buy next. So, for
example, I'm trying to run a query that extracts all orders containing
product1 and then trying to run another query that gives me a count on
products purchased AFTER that product was purchased.
My table relationships are fairy standard for an order processing database:
Customer table (CustomerID) ---> Orders table (OrderID,OrderD ate) -->
OrderDetails table (OrderID/ProductID) ---> Products table (ProductID)
I can easily extract buyers of product1 but I'm having difficulty retrieving
the first instance of product1 where product1 has been bought by the same
customer more than once. I've tried grouping by "First" in a "group by"
query but that doesn't give me the first record, it still gives me all of
them. Any pointers or ideas as to how my query should look?
Thanks
Alan 2 1480
On Thu, 15 Dec 2005 12:49:54 +0000 (UTC), "Alan" <no****@nospam. com>
wrote:
I'm not thrilled with First and Last; would use Min and Max instead.
They have a more solid SQL underpinning.
Using the Northwind sample database:
List of customers with the first time they ordered productid=1:
SELECT Orders.Customer ID, Min(Orders.Orde rDate) AS MinOfOrderDate
FROM Orders INNER JOIN [Order Details] ON Orders.OrderID = [Order
Details].OrderID
WHERE ((([Order Details].ProductID)=1))
GROUP BY Orders.Customer ID;
Save this as query Q1
Here is Q2: the list of subsequent orders
SELECT Orders.Customer ID, Orders.OrderDat e
FROM Q1 INNER JOIN Orders ON Q1.CustomerID = Orders.Customer ID
WHERE (((Orders.Order Date)>[MinOfOrderDate]));
Q3: Minimum subsequent order:
SELECT Q2.CustomerID, Min(Q2.OrderDat e) AS MinOfOrderDate
FROM Q2
GROUP BY Q2.CustomerID;
Q4: The products purchased in the subsequent order:
SELECT Orders.Customer ID, Products.Produc tID, Products.Produc tName
FROM Q3 INNER JOIN (Products INNER JOIN (Orders INNER JOIN [Order
Details] ON Orders.OrderID = [Order Details].OrderID) ON
Products.Produc tID = [Order Details].ProductID) ON (Q3.MinOfOrderD ate
= Orders.OrderDat e) AND (Q3.CustomerID = Orders.Customer ID);
-Tom. I'm having a bit of difficulty getting the results I need from our database.
In a nutshell I'm trying to work out trends in what people buy next. So, for example, I'm trying to run a query that extracts all orders containing product1 and then trying to run another query that gives me a count on products purchased AFTER that product was purchased.
My table relationships are fairy standard for an order processing database:
Customer table (CustomerID) ---> Orders table (OrderID,OrderD ate) --> OrderDetails table (OrderID/ProductID) ---> Products table (ProductID)
I can easily extract buyers of product1 but I'm having difficulty retrieving the first instance of product1 where product1 has been bought by the same customer more than once. I've tried grouping by "First" in a "group by" query but that doesn't give me the first record, it still gives me all of them. Any pointers or ideas as to how my query should look?
Thanks
Alan
Thanks Tom, that gives me exactly what I want! If I turn the last query into
a make table and then run a group by query to count the product names, I can
see what the most popular "next" purchase is.
Also, if I drop Q3 and perform Q4 on Q2 I can find out in general what
people order (not just immediately after) after they've purchased said
product....unle ss my logic is flawed there?!
Thanks again, this has stopped me going bald with pulling my hair out!
Allan
"Tom van Stiphout" <no************ *@cox.net> wrote in message
news:ep******** *************** *********@4ax.c om... On Thu, 15 Dec 2005 12:49:54 +0000 (UTC), "Alan" <no****@nospam. com> wrote:
I'm not thrilled with First and Last; would use Min and Max instead. They have a more solid SQL underpinning.
Using the Northwind sample database: List of customers with the first time they ordered productid=1: SELECT Orders.Customer ID, Min(Orders.Orde rDate) AS MinOfOrderDate FROM Orders INNER JOIN [Order Details] ON Orders.OrderID = [Order Details].OrderID WHERE ((([Order Details].ProductID)=1)) GROUP BY Orders.Customer ID; Save this as query Q1
Here is Q2: the list of subsequent orders SELECT Orders.Customer ID, Orders.OrderDat e FROM Q1 INNER JOIN Orders ON Q1.CustomerID = Orders.Customer ID WHERE (((Orders.Order Date)>[MinOfOrderDate]));
Q3: Minimum subsequent order: SELECT Q2.CustomerID, Min(Q2.OrderDat e) AS MinOfOrderDate FROM Q2 GROUP BY Q2.CustomerID;
Q4: The products purchased in the subsequent order: SELECT Orders.Customer ID, Products.Produc tID, Products.Produc tName FROM Q3 INNER JOIN (Products INNER JOIN (Orders INNER JOIN [Order Details] ON Orders.OrderID = [Order Details].OrderID) ON Products.Produc tID = [Order Details].ProductID) ON (Q3.MinOfOrderD ate = Orders.OrderDat e) AND (Q3.CustomerID = Orders.Customer ID);
-Tom. I'm having a bit of difficulty getting the results I need from our
database. In a nutshell I'm trying to work out trends in what people buy next. So,
forexample, I'm trying to run a query that extracts all orders containing product1 and then trying to run another query that gives me a count on products purchased AFTER that product was purchased.
My table relationships are fairy standard for an order processing
database: Customer table (CustomerID) ---> Orders table (OrderID,OrderD ate) --> OrderDetails table (OrderID/ProductID) ---> Products table (ProductID)
I can easily extract buyers of product1 but I'm having difficulty
retrievingthe first instance of product1 where product1 has been bought by the same customer more than once. I've tried grouping by "First" in a "group by" query but that doesn't give me the first record, it still gives me all of them. Any pointers or ideas as to how my query should look?
Thanks
Alan This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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