two tables with same field names - need IIf statement with math

D

deb

I create an order status table for my division each week by running queries
on corporate's systems. The field names are always the same, and there lies
my problem. I need to measure the change in promise dates weekly to the order
line level. For example, I need to pull last monday's promise date minus this
monday's promise date to get the change in number of days.
 
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