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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.
Most Upvoted Answer
In an Entity-Relationship (ER) model, suppose R is a many-to-one relat...
Understanding the Entity-Relationship (ER) Model
The Entity-Relationship (ER) model is a conceptual model used to represent the relationships between entities in a database. It consists of entities, attributes, and relationships. Entities represent real-world objects or concepts, attributes represent properties of entities, and relationships represent associations between entities.
Many-to-One Relationship
In a many-to-one relationship, multiple entities from one entity set are associated with a single entity from another entity set. It means that for every entity in the first entity set, there is a corresponding entity in the second entity set. However, multiple entities from the first entity set can be associated with the same entity in the second entity set.
Cardinality of Entity Sets
The cardinality of an entity set refers to the number of entities it contains. It can be one of the following: zero, one, or many. In this scenario, the cardinality of entity set E1 is greater than the cardinality of entity set E2.
Options Explanation
Let's analyze each option to determine the correct one:
a) Every entity in E1 is associated with exactly one entity in E2.
This statement is true in a many-to-one relationship. Since E1 has a greater cardinality than E2, it means that every entity in E1 must be associated with exactly one entity in E2. This is because if a single entity in E2 was associated with multiple entities in E1, it would contradict the cardinality of E2 being less than E1.
b) Some entity in E1 is associated with more than one entity in E2.
This statement is false in a many-to-one relationship. In a many-to-one relationship, each entity in E1 can only be associated with one entity in E2.
c) Every entity in E2 is associated with exactly one entity in E1.
This statement is false in a many-to-one relationship. While every entity in E1 is associated with exactly one entity in E2, it does not guarantee that every entity in E2 is associated with exactly one entity in E1. There can be multiple entities in E2 that are associated with the same entity in E1.
d) Every entity in E2 is associated with at most one entity in E1.
This statement is false in a many-to-one relationship. The phrase "at most one" means that an entity in E2 can be associated with zero or one entity in E1. However, in a many-to-one relationship, each entity in E2 is associated with exactly one entity in E1.
Therefore, the correct answer is option 'a': Every entity in E1 is associated with exactly one entity in E2.
The Entity-Relationship (ER) model is a conceptual model used to represent the relationships between entities in a database. It consists of entities, attributes, and relationships. Entities represent real-world objects or concepts, attributes represent properties of entities, and relationships represent associations between entities.
Many-to-One Relationship
In a many-to-one relationship, multiple entities from one entity set are associated with a single entity from another entity set. It means that for every entity in the first entity set, there is a corresponding entity in the second entity set. However, multiple entities from the first entity set can be associated with the same entity in the second entity set.
Cardinality of Entity Sets
The cardinality of an entity set refers to the number of entities it contains. It can be one of the following: zero, one, or many. In this scenario, the cardinality of entity set E1 is greater than the cardinality of entity set E2.
Options Explanation
Let's analyze each option to determine the correct one:
a) Every entity in E1 is associated with exactly one entity in E2.
This statement is true in a many-to-one relationship. Since E1 has a greater cardinality than E2, it means that every entity in E1 must be associated with exactly one entity in E2. This is because if a single entity in E2 was associated with multiple entities in E1, it would contradict the cardinality of E2 being less than E1.
b) Some entity in E1 is associated with more than one entity in E2.
This statement is false in a many-to-one relationship. In a many-to-one relationship, each entity in E1 can only be associated with one entity in E2.
c) Every entity in E2 is associated with exactly one entity in E1.
This statement is false in a many-to-one relationship. While every entity in E1 is associated with exactly one entity in E2, it does not guarantee that every entity in E2 is associated with exactly one entity in E1. There can be multiple entities in E2 that are associated with the same entity in E1.
d) Every entity in E2 is associated with at most one entity in E1.
This statement is false in a many-to-one relationship. The phrase "at most one" means that an entity in E2 can be associated with zero or one entity in E1. However, in a many-to-one relationship, each entity in E2 is associated with exactly one entity in E1.
Therefore, the correct answer is option 'a': Every entity in E1 is associated with exactly one entity in E2.
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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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