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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?
- a)Every entity in E1 is associated with exactly one entity in E2.
- b)Some entity in E1 is associated with more than one entity in E2.
- c)Every entity in E2 is associated with exactly one entity in E1.
- d)Every entity in E2 is associated with at most one entity in E1.
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
In an Entity-Relationship (ER) model, suppose R is a many-to-one relat...
Since given relation is many to one :
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. Only option (A) is correct.
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. Only option (A) is correct.
Most Upvoted Answer
In an Entity-Relationship (ER) model, suppose R is a many-to-one relat...
Explanation:
Entity-Relationship (ER) Model:
The Entity-Relationship (ER) model is a conceptual data model used to represent the relationships between entities in a database. It represents real-world entities as entities, relationships between entities as relationships, and attributes of entities as attributes.
Many-to-One Relationship:
In an ER model, a many-to-one relationship is a type of relationship where multiple entities from one entity set (E1) are associated with a single entity from another entity set (E2). This means that for every entity in E1, there is exactly one entity in E2 associated with it.
Total Participation:
Total participation in a relationship means that every entity in one entity set must participate in the relationship with an entity from the other entity set. In this case, both E1 and E2 participate totally in the relationship R.
Cardinality of E1 and E2:
The cardinality of an entity set represents the number of entities it contains. In this question, it is given that the cardinality of E1 is greater than the cardinality of E2.
Options:
a) Every entity in E1 is associated with exactly one entity in E2.
b) Some entity in E1 is associated with more than one entity in E2.
c) Every entity in E2 is associated with exactly one entity in E1.
d) Every entity in E2 is associated with at most one entity in E1.
Explanation of the Correct Answer:
The correct answer is option 'a', which states that every entity in E1 is associated with exactly one entity in E2.
Since R is a many-to-one relationship, each entity in E1 can be associated with at most one entity in E2. However, due to the total participation of E1 and E2 in R, every entity in E1 must be associated with exactly one entity in E2. This is because every entity in E1 must participate in the relationship, and if an entity in E1 is not associated with any entity in E2, it would violate the total participation constraint.
Since the cardinality of E1 is greater than the cardinality of E2, it is possible that some entities in E1 are associated with the same entity in E2. However, each entity in E1 is still associated with exactly one entity in E2.
Therefore, option 'a' is the correct answer.
Entity-Relationship (ER) Model:
The Entity-Relationship (ER) model is a conceptual data model used to represent the relationships between entities in a database. It represents real-world entities as entities, relationships between entities as relationships, and attributes of entities as attributes.
Many-to-One Relationship:
In an ER model, a many-to-one relationship is a type of relationship where multiple entities from one entity set (E1) are associated with a single entity from another entity set (E2). This means that for every entity in E1, there is exactly one entity in E2 associated with it.
Total Participation:
Total participation in a relationship means that every entity in one entity set must participate in the relationship with an entity from the other entity set. In this case, both E1 and E2 participate totally in the relationship R.
Cardinality of E1 and E2:
The cardinality of an entity set represents the number of entities it contains. In this question, it is given that the cardinality of E1 is greater than the cardinality of E2.
Options:
a) Every entity in E1 is associated with exactly one entity in E2.
b) Some entity in E1 is associated with more than one entity in E2.
c) Every entity in E2 is associated with exactly one entity in E1.
d) Every entity in E2 is associated with at most one entity in E1.
Explanation of the Correct Answer:
The correct answer is option 'a', which states that every entity in E1 is associated with exactly one entity in E2.
Since R is a many-to-one relationship, each entity in E1 can be associated with at most one entity in E2. However, due to the total participation of E1 and E2 in R, every entity in E1 must be associated with exactly one entity in E2. This is because every entity in E1 must participate in the relationship, and if an entity in E1 is not associated with any entity in E2, it would violate the total participation constraint.
Since the cardinality of E1 is greater than the cardinality of E2, it is possible that some entities in E1 are associated with the same entity in E2. However, each entity in E1 is still associated with exactly one entity in E2.
Therefore, option 'a' is the correct answer.
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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?a)Every entity in E1 is associated with exactly one entity in E2.b)Some entity in E1 is associated with more than one entity in E2.c)Every entity in E2 is associated with exactly one entity in E1.d)Every entity in E2 is associated with at most one entity in E1.Correct answer is option 'A'. Can you explain this answer?
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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?a)Every entity in E1 is associated with exactly one entity in E2.b)Some entity in E1 is associated with more than one entity in E2.c)Every entity in E2 is associated with exactly one entity in E1.d)Every entity in E2 is associated with at most one entity in E1.Correct answer is option 'A'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about 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?a)Every entity in E1 is associated with exactly one entity in E2.b)Some entity in E1 is associated with more than one entity in E2.c)Every entity in E2 is associated with exactly one entity in E1.d)Every entity in E2 is associated with at most one entity in E1.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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?a)Every entity in E1 is associated with exactly one entity in E2.b)Some entity in E1 is associated with more than one entity in E2.c)Every entity in E2 is associated with exactly one entity in E1.d)Every entity in E2 is associated with at most one entity in E1.Correct answer is option 'A'. Can you explain this answer?.
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?a)Every entity in E1 is associated with exactly one entity in E2.b)Some entity in E1 is associated with more than one entity in E2.c)Every entity in E2 is associated with exactly one entity in E1.d)Every entity in E2 is associated with at most one entity in E1.Correct answer is option 'A'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about 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?a)Every entity in E1 is associated with exactly one entity in E2.b)Some entity in E1 is associated with more than one entity in E2.c)Every entity in E2 is associated with exactly one entity in E1.d)Every entity in E2 is associated with at most one entity in E1.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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?a)Every entity in E1 is associated with exactly one entity in E2.b)Some entity in E1 is associated with more than one entity in E2.c)Every entity in E2 is associated with exactly one entity in E1.d)Every entity in E2 is associated with at most one entity in E1.Correct answer is option 'A'. Can you explain this answer?.
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