GATE | GATE CS Mock 2018 | Set 2 | Question 16

How many minimum relation tables are required which satisfy 1NF?

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(A) 2, 2, and 1 respectively
(B) 2, 2, and 2 respectively
(C) 1, 2, and 1 respectively
(D) 1, 1, and 1 respectively


Answer: (A)

Explanation: First ER model will required minimum number of two tables for 1NF with {E2R}, and {E1}. “Many” side of the relation can be merged because it is many to one relation and participation is partial both sides of the relation.



Second ER model will required minimum number of two tables for 1NF with {E2R}, and {E1}. “One” side entity cannot be merged because it has total participation in “many” side of the relationship and “one” side of the relationship is participating partially.

Third ER model will required minimum number of 1 table if no redundancy is occurred. It is a many to many relationship but total participation is here both sides of the relationship.

Therefore, (A) 2, 2, and 1 respectively is correct.

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