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Consider an Entity-Relationship (ER) model in which entity sets E1 and E2 are connected by an m : n relationship R12, E1 and E3 are connected by a 1 : n (1 on the side of E1 and n on the side of E3) relationship R13. E1 has two single-valued attributes a11 and a12 of which a11 is the key attribute. E2 has two single-valued attributes a21 and a22 is the key attribute. E3 has two single-valued attributes a31 and a32 of which a31 is the key attribute. The relationships do not have any attributes. If a relational model is derived from the above ER model, then the minimum number of relations that would be generated if all the relations are in 3NF is ___________.
- a)2
- b)3
- c)4
- d)5
Correct answer is option 'C'. Can you explain this answer?
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Consider an Entity-Relationship (ER) model in which entity sets E1 and...
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Consider an Entity-Relationship (ER) model in which entity sets E1 and...
Solution:
The given ER model can be represented as follows:
E1(a11*, a12)
E2(a22*, a21)
E3(a31*, a32)
R12
R13
To convert this ER model into a relational model in 3NF, we need to follow the below steps:
Step 1: Create a relation for each entity set and include all the attributes of the entity set in the relation.
E1(a11*, a12)
E2(a22*, a21)
E3(a31*, a32)
Step 2: Create a relation for each relationship set. For each m:n relationship set, create a new relation that includes the primary keys of the participating entity sets as foreign keys in the new relation. For each 1:n relationship set, include the primary key of the “one” entity set as a foreign key in the relation corresponding to the “many” entity set.
R12(a11*, a22*)
R13(a11*, a31*)
Step 3: Check for transitive dependencies and remove them by creating new relations.
Since there are no transitive dependencies in the given ER model, we can skip this step.
Therefore, the minimum number of relations that would be generated if all the relations are in 3NF is 4, which are listed below:
E1(a11*, a12)
E2(a22*, a21)
E3(a31*, a32)
R12(a11*, a22*)
R13(a11*, a31*)
Hence, the correct answer is option C, which is 4.
The given ER model can be represented as follows:
E1(a11*, a12)
E2(a22*, a21)
E3(a31*, a32)
R12
R13
To convert this ER model into a relational model in 3NF, we need to follow the below steps:
Step 1: Create a relation for each entity set and include all the attributes of the entity set in the relation.
E1(a11*, a12)
E2(a22*, a21)
E3(a31*, a32)
Step 2: Create a relation for each relationship set. For each m:n relationship set, create a new relation that includes the primary keys of the participating entity sets as foreign keys in the new relation. For each 1:n relationship set, include the primary key of the “one” entity set as a foreign key in the relation corresponding to the “many” entity set.
R12(a11*, a22*)
R13(a11*, a31*)
Step 3: Check for transitive dependencies and remove them by creating new relations.
Since there are no transitive dependencies in the given ER model, we can skip this step.
Therefore, the minimum number of relations that would be generated if all the relations are in 3NF is 4, which are listed below:
E1(a11*, a12)
E2(a22*, a21)
E3(a31*, a32)
R12(a11*, a22*)
R13(a11*, a31*)
Hence, the correct answer is option C, which is 4.
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Consider an Entity-Relationship (ER) model in which entity sets E1 and E2 are connected by an m : n relationship R12, E1 and E3 are connected by a 1 : n (1 on the side of E1 and n on the side of E3) relationship R13. E1 has two single-valued attributes a11and a12of which a11is the key attribute. E2 has two single-valued attributes a21and a22is the key attribute. E3 has two single-valued attributes a31and a32of which a31is the key attribute. The relationships do not have any attributes. If a relational model is derived from the above ER model, then the minimum number of relations that would be generated if all the relations are in 3NF is ___________.a)2b)3c)4d)5Correct answer is option 'C'. Can you explain this answer?
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Consider an Entity-Relationship (ER) model in which entity sets E1 and E2 are connected by an m : n relationship R12, E1 and E3 are connected by a 1 : n (1 on the side of E1 and n on the side of E3) relationship R13. E1 has two single-valued attributes a11and a12of which a11is the key attribute. E2 has two single-valued attributes a21and a22is the key attribute. E3 has two single-valued attributes a31and a32of which a31is the key attribute. The relationships do not have any attributes. If a relational model is derived from the above ER model, then the minimum number of relations that would be generated if all the relations are in 3NF is ___________.a)2b)3c)4d)5Correct answer is option 'C'. 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 Consider an Entity-Relationship (ER) model in which entity sets E1 and E2 are connected by an m : n relationship R12, E1 and E3 are connected by a 1 : n (1 on the side of E1 and n on the side of E3) relationship R13. E1 has two single-valued attributes a11and a12of which a11is the key attribute. E2 has two single-valued attributes a21and a22is the key attribute. E3 has two single-valued attributes a31and a32of which a31is the key attribute. The relationships do not have any attributes. If a relational model is derived from the above ER model, then the minimum number of relations that would be generated if all the relations are in 3NF is ___________.a)2b)3c)4d)5Correct answer is option 'C'. 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 Consider an Entity-Relationship (ER) model in which entity sets E1 and E2 are connected by an m : n relationship R12, E1 and E3 are connected by a 1 : n (1 on the side of E1 and n on the side of E3) relationship R13. E1 has two single-valued attributes a11and a12of which a11is the key attribute. E2 has two single-valued attributes a21and a22is the key attribute. E3 has two single-valued attributes a31and a32of which a31is the key attribute. The relationships do not have any attributes. If a relational model is derived from the above ER model, then the minimum number of relations that would be generated if all the relations are in 3NF is ___________.a)2b)3c)4d)5Correct answer is option 'C'. Can you explain this answer?.
Consider an Entity-Relationship (ER) model in which entity sets E1 and E2 are connected by an m : n relationship R12, E1 and E3 are connected by a 1 : n (1 on the side of E1 and n on the side of E3) relationship R13. E1 has two single-valued attributes a11and a12of which a11is the key attribute. E2 has two single-valued attributes a21and a22is the key attribute. E3 has two single-valued attributes a31and a32of which a31is the key attribute. The relationships do not have any attributes. If a relational model is derived from the above ER model, then the minimum number of relations that would be generated if all the relations are in 3NF is ___________.a)2b)3c)4d)5Correct answer is option 'C'. 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 Consider an Entity-Relationship (ER) model in which entity sets E1 and E2 are connected by an m : n relationship R12, E1 and E3 are connected by a 1 : n (1 on the side of E1 and n on the side of E3) relationship R13. E1 has two single-valued attributes a11and a12of which a11is the key attribute. E2 has two single-valued attributes a21and a22is the key attribute. E3 has two single-valued attributes a31and a32of which a31is the key attribute. The relationships do not have any attributes. If a relational model is derived from the above ER model, then the minimum number of relations that would be generated if all the relations are in 3NF is ___________.a)2b)3c)4d)5Correct answer is option 'C'. 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 Consider an Entity-Relationship (ER) model in which entity sets E1 and E2 are connected by an m : n relationship R12, E1 and E3 are connected by a 1 : n (1 on the side of E1 and n on the side of E3) relationship R13. E1 has two single-valued attributes a11and a12of which a11is the key attribute. E2 has two single-valued attributes a21and a22is the key attribute. E3 has two single-valued attributes a31and a32of which a31is the key attribute. The relationships do not have any attributes. If a relational model is derived from the above ER model, then the minimum number of relations that would be generated if all the relations are in 3NF is ___________.a)2b)3c)4d)5Correct answer is option 'C'. Can you explain this answer?.
Solutions for Consider an Entity-Relationship (ER) model in which entity sets E1 and E2 are connected by an m : n relationship R12, E1 and E3 are connected by a 1 : n (1 on the side of E1 and n on the side of E3) relationship R13. E1 has two single-valued attributes a11and a12of which a11is the key attribute. E2 has two single-valued attributes a21and a22is the key attribute. E3 has two single-valued attributes a31and a32of which a31is the key attribute. The relationships do not have any attributes. If a relational model is derived from the above ER model, then the minimum number of relations that would be generated if all the relations are in 3NF is ___________.a)2b)3c)4d)5Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE).
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