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An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?
- a)Relation R is one-to-many and the participation of A in R is total.
- b)Relation R is one-to-many and the participation of A in R is partial.
- c)Relation R is many-to-one and the participation of A in R is total.
- d)Relation R is many-to-one and the participation of A in R is partial.
Correct answer is option 'C'. Can you explain this answer?
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An ER model of a database consists of entity types A and B. These are ...
In one to many or many to one participation, relation is merged in table which is on many side and if there is total participation then relation is merged in that side. Therefore, option C is correct
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An ER model of a database consists of entity types A and B. These are ...
Explanation:
An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?
a) Relation R is one-to-many and the participation of A in R is total.
In this case, it is not possible to merge the relational table for R with that of A because A has a total participation in R, which means that every instance of A must participate in at least one instance of R. Hence, there may be instances of A that do not have any corresponding instances in R.
b) Relation R is one-to-many and the participation of A in R is partial.
In this case, it is not possible to merge the relational table for R with that of A because A has a partial participation in R, which means that some instances of A may not participate in any instance of R. Hence, there may be instances of A that do not have any corresponding instances in R.
c) Relation R is many-to-one and the participation of A in R is total.
In this case, it is possible to merge the relational table for R with that of A because every instance of A must participate in at least one instance of R, and every instance of R must have a corresponding instance of A. Hence, the relational table for R can be merged with that of A.
d) Relation R is many-to-one and the participation of A in R is partial.
In this case, it is not possible to merge the relational table for R with that of A because some instances of A may not participate in any instance of R. Hence, there may be instances of A that do not have any corresponding instances in R.
Therefore, the correct answer is option 'C'.
An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?
a) Relation R is one-to-many and the participation of A in R is total.
In this case, it is not possible to merge the relational table for R with that of A because A has a total participation in R, which means that every instance of A must participate in at least one instance of R. Hence, there may be instances of A that do not have any corresponding instances in R.
b) Relation R is one-to-many and the participation of A in R is partial.
In this case, it is not possible to merge the relational table for R with that of A because A has a partial participation in R, which means that some instances of A may not participate in any instance of R. Hence, there may be instances of A that do not have any corresponding instances in R.
c) Relation R is many-to-one and the participation of A in R is total.
In this case, it is possible to merge the relational table for R with that of A because every instance of A must participate in at least one instance of R, and every instance of R must have a corresponding instance of A. Hence, the relational table for R can be merged with that of A.
d) Relation R is many-to-one and the participation of A in R is partial.
In this case, it is not possible to merge the relational table for R with that of A because some instances of A may not participate in any instance of R. Hence, there may be instances of A that do not have any corresponding instances in R.
Therefore, the correct answer is option 'C'.
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An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?a)Relation R is one-to-many and the participation of A in R is total.b)Relation R is one-to-many and the participation of A in R is partial.c)Relation R is many-to-one and the participation of A in R is total.d)Relation R is many-to-one and the participation of A in R is partial.Correct answer is option 'C'. Can you explain this answer?
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An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?a)Relation R is one-to-many and the participation of A in R is total.b)Relation R is one-to-many and the participation of A in R is partial.c)Relation R is many-to-one and the participation of A in R is total.d)Relation R is many-to-one and the participation of A in R is partial.Correct answer is option 'C'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?a)Relation R is one-to-many and the participation of A in R is total.b)Relation R is one-to-many and the participation of A in R is partial.c)Relation R is many-to-one and the participation of A in R is total.d)Relation R is many-to-one and the participation of A in R is partial.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?a)Relation R is one-to-many and the participation of A in R is total.b)Relation R is one-to-many and the participation of A in R is partial.c)Relation R is many-to-one and the participation of A in R is total.d)Relation R is many-to-one and the participation of A in R is partial.Correct answer is option 'C'. Can you explain this answer?.
An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?a)Relation R is one-to-many and the participation of A in R is total.b)Relation R is one-to-many and the participation of A in R is partial.c)Relation R is many-to-one and the participation of A in R is total.d)Relation R is many-to-one and the participation of A in R is partial.Correct answer is option 'C'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?a)Relation R is one-to-many and the participation of A in R is total.b)Relation R is one-to-many and the participation of A in R is partial.c)Relation R is many-to-one and the participation of A in R is total.d)Relation R is many-to-one and the participation of A in R is partial.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?a)Relation R is one-to-many and the participation of A in R is total.b)Relation R is one-to-many and the participation of A in R is partial.c)Relation R is many-to-one and the participation of A in R is total.d)Relation R is many-to-one and the participation of A in R is partial.Correct answer is option 'C'. Can you explain this answer?.
Solutions for An ER model of a database consists of entity types A and B. These are connected by a relationship R which does not have its own attribute. Under which of the following conditions, can the relational table for R be merged with that of A?a)Relation R is one-to-many and the participation of A in R is total.b)Relation R is one-to-many and the participation of A in R is partial.c)Relation R is many-to-one and the participation of A in R is total.d)Relation R is many-to-one and the participation of A in R is partial.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for GATE.
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