Choose all of t correct answers for each of the following: Consider the relationship R between two entity sets E, and E₂. Let K, and K₂ be the sets of key attributes of E, and E₂, respectively: E₁(K. other attributes of E₁); Ex(K, other attributes of E₂). Further, assume that R has no attributes [a] If R is one-one between E, and E₂, then the key[s] for the relation R: 1-(K₁) 2-(K₂) 3- (K₁, K₂) 4- All of the above 5- None of the above [b] If R is one-many from E, to E₂, Then the key[s] for the relation R: 1- (K₁) 2-(K₂) 3- (K₁, K₂) 4- All of the above 5- None of the above [c] If R is many-many between E, and E₂, then the key[s] for the relation R: 1- (K₂) 2- (K₂) 3- (K₁, K₂) 4- All of the above 5- None of the above
Choose all of t correct answers for each of the following: Consider the relationship R between two entity sets E, and E₂. Let K, and K₂ be the sets of key attributes of E, and E₂, respectively: E₁(K. other attributes of E₁); Ex(K, other attributes of E₂). Further, assume that R has no attributes [a] If R is one-one between E, and E₂, then the key[s] for the relation R: 1-(K₁) 2-(K₂) 3- (K₁, K₂) 4- All of the above 5- None of the above [b] If R is one-many from E, to E₂, Then the key[s] for the relation R: 1- (K₁) 2-(K₂) 3- (K₁, K₂) 4- All of the above 5- None of the above [c] If R is many-many between E, and E₂, then the key[s] for the relation R: 1- (K₂) 2- (K₂) 3- (K₁, K₂) 4- All of the above 5- None of the above
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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![Choose all of the correct answers for each of the following:
Consider the relationship R between two entity sets E, and E₂. Let K, and K₂ be
the sets of key attributes of E, and E₂, respectively:
E₁(K, other attributes of E₁);
Ex(K, other attributes of E₂).
Further, assume that R has no attributes
[a] If R is one-one between E₁ and E₂, then the key[s] for the relation R:
[b]
1-(K₂)
2-(K₂)
3- (K₁, K₂)
4- All of the above
5- None of the above
If R is one-many from E, to E₂, Then the key[s] for the relation R:
1- (K₂)
2-(K₂)
3-(K₁, K₂)
4- All of the above
5- None of the above
[c] If R is many-many between E₁ and E₂, then the key[s] for the relation R:
1- (K₁)
2- (K₂)
3- (K₁, K₂)
4- All of the above
5- None of the above
[d] If R is many-many between E, and E₂ and has an attribute A, Then the
key[s] for the relation R:
1-(K₁)
2- (K₂)
3-(K₁, K₂)
4- All of the above
5- None of the above](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdf757dcf-74ee-412e-8a8d-578ccd237cce%2F749ddd06-b48e-40d1-8191-0719dfd6981d%2Fq1u309i_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Choose all of the correct answers for each of the following:
Consider the relationship R between two entity sets E, and E₂. Let K, and K₂ be
the sets of key attributes of E, and E₂, respectively:
E₁(K, other attributes of E₁);
Ex(K, other attributes of E₂).
Further, assume that R has no attributes
[a] If R is one-one between E₁ and E₂, then the key[s] for the relation R:
[b]
1-(K₂)
2-(K₂)
3- (K₁, K₂)
4- All of the above
5- None of the above
If R is one-many from E, to E₂, Then the key[s] for the relation R:
1- (K₂)
2-(K₂)
3-(K₁, K₂)
4- All of the above
5- None of the above
[c] If R is many-many between E₁ and E₂, then the key[s] for the relation R:
1- (K₁)
2- (K₂)
3- (K₁, K₂)
4- All of the above
5- None of the above
[d] If R is many-many between E, and E₂ and has an attribute A, Then the
key[s] for the relation R:
1-(K₁)
2- (K₂)
3-(K₁, K₂)
4- All of the above
5- None of the above
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