Relational Algebra Selecting Duplicates
I am trying to do part C of this assignment here below
I have been stuck on this for quite a while now, I can't seem to come up
with a solution because no matter what operation I use it automatically
removes duplicates and proves useless. I initially tried to take the
accnumber from the Owns table and subtract from it the accnumber in the
Account table, and selecting all rows with this accnumber from the Owns
table again. This proved futile, or maybe I didn't do it correctly. If
anyone can help, that would be awesome. Thanks.
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