GATE | CS | 2012 | Databases | Relational Algebra | Question 50 (original) (raw)
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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
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