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Thanks for this arnelgp but it is a cumulative total rather than a rolling/moving 12 month total. I have already already catered for...
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Hi Tom
Thanks for this suggestion. I had to make some slight tweaks as detailed below:
SELECT Sum(SumOfTotalCost) AS RollingTotal...
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Hi
I'm creating a simple Customer Invoice db for a friend.
I've created the customer & invoice tables, and a query "CustomerInvoice"...