GATE | GATE MOCK 2017 | Question 32

What is the min and max number of tables required to convert an ER diagram with 2 entities and 1 relationship between them with partial participation constraints of both entities?

(A) Min 1 and max 2

(B) Min 1 and max 3

(C) Min 2 and max 3

(D) Min 2 and max 2


Answer: (C)

Explanation: Maximum number of tables required is 3 in case of many to many relationships between entities. Minimum number of tables is 1 in case of unary relationship and total participation of atleast one entity. But in case of partial participation of both entities, minimum number of tables required is 2.

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