Question

In an Entity-Relationship (ER) model, suppose R is a one-to-many relationship from entity set E1 to entity set E2. Assume that E1 and E2 participate totally in Rand that the cardinality of
Which one of the following is true about R?

Answer 1

Answer: Every entity in E1 is associated with exactly one entity in E2.

Therefore, no entity in E1 can be related to more than one entity in E2 and an entity in E2 can be related to more than one entity in E1.

Explanation:  

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Answer 2

In an Entity-Relationship (ER) model, suppose R is a one-to-many relationship from entity set E1 to entity set E2. Assume that E1 and E2 participate totally in Rand that the cardinality of

Which one of the following is true about R?

1. Every entity in E1 is associated with exactly one entity in E2.

2. Some entity in E1 is associated with more than one entity in E2.

3. Every entity in E2 is associated with exactly one entity in E1.

4. Every entity in E2 is associated with at most one entity in E1.

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