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C is provided as the answer. Statement P, I understand but why S is also correct?

in Databases by Active (4.8k points)
edited by | 63 views
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This time Gate forum is correct :)

And that is subset not substring in S.

Take t2 as {A, B, C} and t1 as {A,B}   statement R will lead to error.

And thus statement S is true.
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Thank You :D

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