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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 option is/are true?
  • a)
     Every entity in Y is associated with at least one entity in X.
  • b)
     The maximum participation of Y in the relationship is M.
  • c)
     Every entity in X is associated with exactly one entity in Y.Correct Answer
  • d)
     The minimum participation of X in the relationship is 0.
Correct answer is option 'C,D'. Can you explain this answer?
Most Upvoted Answer
In an ER model, suppose relation R is a 1 : M relationship from entity...
Given,
In an ER model, suppose relation R is a 1 : M relationship from entity set Y to entity set X.
For X,
Minimum participation = 1
Maximum participation = 1
So, every entity in X is associated with exactly one entity in Y.
For Y,
Minimum participation = 0
Maximum participation = M
So, the maximum participation of Y in the relationship is M.
As we know,
In question X and Y are sets, the cardinality of a set is instances of an entity.
Instances of X > Instances of Y.
Hence, the correct options are (C) and (D).
Free Test
Community Answer
In an ER model, suppose relation R is a 1 : M relationship from entity...
Explanation:

Every entity in Y is associated with at least one entity in X:
- Since the relationship R is a 1 : M relationship from Y to X, every entity in Y must be associated with at least one entity in X. This ensures that the relationship is maintained and every entity in Y has a corresponding entity in X.

The maximum participation of Y in the relationship is M:
- In a 1 : M relationship, the maximum participation of Y is M, meaning that each entity in Y can be associated with multiple entities in X. This allows for a flexible relationship where Y can have multiple connections to X.

Every entity in X is associated with exactly one entity in Y:
- Given that the cardinality of X is greater than the cardinality of Y, every entity in X is associated with exactly one entity in Y. This ensures that each entity in X has a unique connection to an entity in Y, maintaining the integrity of the relationship.

The minimum participation of X in the relationship is 0:
- Since X has participated totally in the relationship R, the minimum participation of X is 0. This means that there may be entities in X that are not connected to any entity in Y, allowing for optional participation of X in the relationship.
Therefore, options 'C' and 'D' are true based on the given scenario in the ER model.
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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 option is/are true?a)Every entity in Y is associated with at least one entity in X.b)The maximum participation of Y in the relationship is M.c)Every entity in X is associated with exactly one entity in Y.Correct Answerd)The minimum participation of X in the relationship is 0.Correct answer is option 'C,D'. Can you explain this answer?
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