GATE CS 2015 Set 2 — Question 40
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Question
Consider two relations with the tuples and . Assume that
R(A,B,C) is the full natural outer join of and . Consider the following tuples of the form . Which one of the following statements is correct?Correct answer
(C) R contains e, f, g but not a, b.
Solution
The full natural outer join of and on the common attribute includes:
1.Matching tuples (Inner Join):
- For : has and has . The join yields , which is tuple .
- For : has . There is no tuple with in . The result is padded with nulls for : , which is tuple .
- For : has . There is no tuple with in . The result is padded with nulls for : , which is tuple .
- Tuple is incorrect because has a match in , so the value must be 7, not null.
- Tuple is incorrect because has a match in , so the value must be 5, not null.
- Tuples and contain values not present in the source relations for the given keys.
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