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Consider a relational schema R(A, B, C, D, E, F, G) with functional dependencies:
A → BC
C → DG
C → E
D → FG
The number of superkeys possible is _____.
Correct answer is '64'. Can you explain this answer?
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Verified Answer
Consider a relational schema R(A, B, C, D, E, F, G) with functional de...
The candidate key for the given schema is A because (A)+ = {A, B, C, D, E, F, G, H}
Note: When there is only candidate key for a relation with n-attributes, there are 2n-1 super keys possible.
In the given relation, there are 7 attributes. Therefore, the total number of super keys possible are 26 = 64.
Most Upvoted Answer
Consider a relational schema R(A, B, C, D, E, F, G) with functional de...
→ B,C → D,E → F,G → A
This schema has seven attributes: A, B, C, D, E, F, and G. The functional dependencies describe the relationships between these attributes.
The first functional dependency, A → B, means that the value of attribute B is determined by the value of attribute A. In other words, if you know the value of A, you can determine the value of B.
The second functional dependency, C → D, means that the value of attribute D is determined by the value of attribute C. Similarly, the third functional dependency, E → F, means that the value of attribute F is determined by the value of attribute E.
The fourth functional dependency, G → A, means that the value of attribute A is determined by the value of attribute G. This creates a circular dependency, which can cause issues with data consistency.
Overall, this schema represents a set of attributes with complex relationships between them. Understanding these relationships is important for designing efficient and effective databases.
This schema has seven attributes: A, B, C, D, E, F, and G. The functional dependencies describe the relationships between these attributes.
The first functional dependency, A → B, means that the value of attribute B is determined by the value of attribute A. In other words, if you know the value of A, you can determine the value of B.
The second functional dependency, C → D, means that the value of attribute D is determined by the value of attribute C. Similarly, the third functional dependency, E → F, means that the value of attribute F is determined by the value of attribute E.
The fourth functional dependency, G → A, means that the value of attribute A is determined by the value of attribute G. This creates a circular dependency, which can cause issues with data consistency.
Overall, this schema represents a set of attributes with complex relationships between them. Understanding these relationships is important for designing efficient and effective databases.
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Consider a relational schema R(A, B, C, D, E, F, G) with functional dependencies:A→ BCC→ DGC→ ED→ FGThe number of superkeys possible is _____.Correct answer is '64'. Can you explain this answer?
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