GATE | GATE CS 2018 | Question 29

Consider the following two tables and four queries in SQL. Book (isbn, bname), Stock (isbn, copies) Query 1:

SELECT B.isbn, S.copies
FROM Book B INNER JOIN Stock S
ON B.isbn = S.isbn;

Query 2:

SELECT B.isbn, S.copies
FROM B B LEFT OUTER JOIN Stock S
ON B.isbn = S.isbn;

Query 3:

SELECT B.isbn, S.copies
FROM Book B RIGHT OUTER JOIN Stock S
ON B.isbn = S.isbn;

Query 4:

SELECT B.isbn, S.copies
FROM B B FULL OUTER JOIN Stock S
ON B.isbn = S.isbn;

Which one of the queries above is certain to have an output that is a superset of the outputs of the other three queries?

(A)

Query 1

(B)

Query 2

(C)

Query 3

(D)

Query 4

Answer

Please comment below if you find anything wrong in the above post
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