i need some help!

1. I would like to find the density of customers per postal code area. The
first problem i have is that my customer data is it's own file with x & y
coordinates. My postal code data is a normal vector data. I want to select
those cusomber within the individual postal code areas. I've written the
following where statement:

postalcode.obj contains customer.obj


and what happens is that a lot of the postal code areas register no
customers, but infact i can see that they should have a very high density. 

HELP



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