Is it possible to join two files in SQL as follows:

a.Cust_type_Buyer_or_Seller value "B" or "S"

b.cust#_buyer example value 123
b.cust#_seller example value 789

Is it possible to join FileA to FileB where a.Cust# will join with b.cust#_buyer ONLY when a.Cust_type_Buyer_or_Seller = "B", and also join with b.cust#_seller ONLY when a.Cust_type_Buyer_or_Seller = "S" ?

Clear as mud?

Hoping this can be done with a CASE statement?

Or maybe with two separate queries?

Thanks in advance!

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