In an Entity-Relationship (ER) model, suppose R is a many-to-one relationship from entity set E1 to entity set E2. Assume that E1 and E2 participate totally in R and that the cardinality of E1 is greater that the cardinality of E2. Which one of the following is true about R?Marks : 1Negative Marks : 0Answer hereEvery entity in E1 is associated with exactly one entity in E2.Some entity in E1 is associated with more than one entity in E2.Every entity in E2 is associated with exactly one entity in E1.Every entity in E2 is associated with at most one entity in E1.
Question
In an Entity-Relationship (ER) model, suppose R is a many-to-one relationship from entity set E1 to entity set E2. Assume that E1 and E2 participate totally in R and that the cardinality of E1 is greater that the cardinality of E2. Which one of the following is true about R?Marks : 1Negative Marks : 0Answer hereEvery entity in E1 is associated with exactly one entity in E2.Some entity in E1 is associated with more than one entity in E2.Every entity in E2 is associated with exactly one entity in E1.Every entity in E2 is associated with at most one entity in E1.
Solution
The correct answer is "Every entity in E1 is associated with exactly one entity in E2."
Here's why:
In a many-to-one relationship from E1 to E2, each entity in E1 can be associated with at most one entity in E2. This is because it's a many-to-one relationship, meaning many entities from E1 can be associated with one entity from E2, but not the other way around.
Since E1 and E2 participate totally in R, every entity in E1 must be associated with an entity in E2. Therefore, every entity in E1 is associated with exactly one entity in E2.
The other options are incorrect because in a many-to-one relationship, an entity in E1 cannot be associated with more than one entity in E2, and an entity in E2 can be associated with more than one entity in E1.
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