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 K, 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 E₁ 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 [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
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 K, 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 E₁ 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 [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
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
Related questions
Question
![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%2Fd418c53e-c1f7-4d99-a0fe-0e03feb27da1%2F8b67d935-c958-4f11-9ef7-07859b3e0c2a%2Fj9k8t7r_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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