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 Book 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 Book 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?

Query 1
Query 2
Query 3
Query 4

LohaHridoy

6 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 4 : Query 4

The FULL OUTER JOIN keyword return all records when there is a match in either left (table1) or right (table2) table records.

Hence it will return the superset of result produced by all other operations.

6 views Answered 2022-09-04 04:29

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