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Double filtering.

 
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I tried to filter the normal customer 1st, then the customer created in this month
The first subquery returns no sets.
I seem to be having trouble when the order details table has got nothing in it

update:

By further breakdown of the problem, how can this return something
when order details has nothing inside, thus a 0 NetSales

update2:
I solved it by adding another union, making the no sales customer in the normal's set
, while having the VIP unchanged


Thanks
Jack
 
It is sorta covered in the JavaRanch Style Guide.
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