Answer Posted / humayun quaiser

unoin:- This operator returns from all the queries(combined
through union) but not duplicate record will be display.
ex- A={1,2,3,4}
B={2,3,4,5}
AUB={1,2,3,4,5}............

Minus:- This operator displays records which belongs to only
the first query.
ex:- A={1,2,3,4}
B= {2,3,5}
A-B={1,4}...................

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