engineering recuitment NIC NIELIT Scientist B 2023 Mock Test DBMS Introduction and ER Model ER Model
In an ER model, suppose relation R is a 1: M relationship from entity set Y to entity set X. Assume that X has participated totally and Y has participated partially in R and that the cardinality of X is greater than the cardinality of Y.
Which of the following is true?
S1. Every entity in Y is associated with at least one entity in X
S2. The maximum participation of Y in the relationship is M.
S3. Every entity in X is associated with exactly one entity in Y
S4. The minimum participation of X in the relationship is 0.
1
Only S1 and S2
2
Only S2 and S3
3
Only S3 and S4
4
S1, S2, S3 and S4