Question
Suppose that two relations R(A, B) and S(A, B) have exactly the same schema. Consider the following equalities in relational algebra, which of the above
Suppose that two relations R(A, B) and S(A, B) have exactly the same schema. Consider the following equalities in relational algebra, which of the above equalities hold in relational algebra?
I. R S = R - (R - S)
II. R S = S - (S - R)
III. R S = R NATURAL-JOIN S
IV. R S = R x S
EXPLAIN WHY DETAILY
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Mastering PostgreSQL 12 Advanced Techniques To Build And Administer Scalable And Reliable PostgreSQL Database Applications
Authors: Hans-Jurgen Schonig
3rd Edition
1838988823, 978-1838988821
