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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: Es(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- (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

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: Es(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- (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

Elements Of Modern Algebra
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.2: Mappings
Problem 9E: For the given subsets A and B of Z, let f(x)=2x and determine whether f:AB is onto and whether it is...
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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
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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