Several ways. Straight join
Select * from filea, fileb where (cust# = cust#_buyer and
cust_type_buyer_or_seller = 'B') or (cust# = cust#_seller and
cust_type_buyer_or_seller = 'S')

You can also use an union, and if you don't mind showing one side
multiple times, just join to one side multiple times.




Kevin Bucknum
Senior Programmer Analyst
MEDDATA/MEDTRON
Tel: 985-893-2550

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Stone, Joel
Sent: Thursday, December 10, 2015 1:27 PM
To: 'Midrange Systems Technical Discussion'
Subject: SQL: how to join two files using field depending on values

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

FileA
a.Cust#
a.Cust_type_Buyer_or_Seller value "B" or "S"



FileB
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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