Database-Management-System
August 29, 2024Database-Management-System
August 29, 2024Database-Management-System
| Question 761 |
Considering relational database, functional dependency between two attributes A and B is denoted by:
| A–> B | |
| B<– A | |
| AB–> R | |
| R<– AB |
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.
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