GATE | GATE CS 2012 | Question 50
Consider the following relations A, B, C. How many tuples does the result of the following relational algebra expression contain? Assume that the schema of A U B is the same as that of A.
Table A
Id Name Age
----------------
12 Arun 60
15 Shreya 24
99 Rohit 11
Table B
Id Name Age
----------------
15 Shreya 24
25 Hari 40
98 Rohit 20
99 Rohit 11
Table C
Id Phone Area
-----------------
10 2200 02
99 2100 01
(A)
7
(B)
4
(C)
5
(D)
9
Answer: (A)
Explanation:
See https://www.geeksforgeeks.org/database-management-system-set-3/
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Last Updated :
28 Jun, 2021
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