Database-Management-System
August 29, 2024Database-Management-System
August 29, 2024Database-Management-System
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Question 761
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Considering relational database, functional dependency between two attributes A and B is denoted by:
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A–> B
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B<– A
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AB–> R
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R<– AB
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Question 761 Explanation:
Given a relation R, a set of attributes X in R is said to functionally determine another set of attributes Y, also in R, (written X → Y) if, and only if, each X value in R is associated with precisely one Y value in R; R is then said to satisfy the functional dependency X → Y.
Correct Answer: A
Question 761 Explanation:
Given a relation R, a set of attributes X in R is said to functionally determine another set of attributes Y, also in R, (written X → Y) if, and only if, each X value in R is associated with precisely one Y value in R; R is then said to satisfy the functional dependency X → Y.