Query for seeing what customer hasn't ordered in specific amount of time??

I have a list of customers, order numbers, order amount and order dates from three tables (below). How do I write a query to show which customers have not placed an order within the past 6 months?

SELECT Orders.OrderNo, Orders.CustCode, Orders.CustDesc, Orders.OrderTotal, Orders.DateEnt, Orders.OrderNo, OrderDet.PartNo, OrderDet.PartDesc, CustCode.Phone, CustCode.APContact, CustCode.APPhone, CustCode.BAddr1, CustCode.BAddr2, CustCode.BCity, CustCode.BState, CustCode.BZIPCode
FROM (Orders LEFT JOIN OrderDet ON Orders.OrderNo = OrderDet.OrderNo) LEFT JOIN CustCode ON Orders.CustCode = CustCode.CustCode;
Kevin SmithAsked:
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mbizupCommented:
Give this a try:

SELECT c.CustCode 
FROM CustCode c LEFT JOIN 
(SELECT CustCode FROM Orders WHERE  DateEnt BETWEEN DateAdd("m", -6, Date())  AND Date()) o ON o.CustCode = c.CustCode
WHERE o.CustCode IS NULL

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mbizupCommented:
You can include other tables/fields as needed in the above query to give you the needed columns, but the keys for finding 'customers with no associated orders in the last 6 months'  are

- Get a subset of the orders table showing orders in the last 6 months (thats what the subquery does above)
- Use a LEFT JOIN so as to consider all customers
- In the criteria, look for CustCode null in the orders table/query... that is what defines 'no matching orders'
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Kevin SmithAuthor Commented:
thanks...had totally forgotten to grade this, sorry.
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