#Madeeasy_Workbook

Question

What should be the answer?

Comments

i hope they wrongly specifies the keys of the relation

1) Borrow(acc-number,card-no,doi) ---> acc-number,card-no combinely form Key of the relation

2) Supp(acc-no,s-name,price,dos) ---> acc-number,s-name combinely form Key of the relation

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Option C and Option B clearly eliminated but problem with option A and D

they are applying Quantifiers on the Result, i don't know how this is possible in TRC.

As per my knowledge, option A is right, But option is always subset of Option D

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option given as A