SQL Super Key Quiz

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Questions and Answers

What is a super key in the context of database normalization?

A super key is a set of attributes that uniquely identifies each tuple in a relation.

Define Third Normal Form (3NF) in the context of database normalization.

3NF is a level of database normalization that eliminates transitive functional dependencies.

What is a transitive functional dependency?

A transitive functional dependency occurs when A determines B, and B determines C, leading to A determining C.

Explain Candidate Key with respect to database normalization.

A candidate key is a minimal super key that uniquely identifies each tuple in a relation. Signup and view all the answers

What is Boyce-Codd Normal Form (BCNF)?

BCNF is a higher level of normalization that eliminates all non-trivial functional dependencies. Signup and view all the answers

What is denoted by the symbol F+?

Closure of a set of functional dependencies Signup and view all the answers

Define Third Normal Form (3NF).

A relation is in 3NF if it is in 2NF and no transitive functional dependencies exist. Signup and view all the answers

What is a Candidate Key?

A minimal super key for a relation. Signup and view all the answers

Explain a Transitive Functional Dependency.

When A determines B, and B determines C, then A indirectly determines C. Signup and view all the answers

What is Boyce-Codd Normal Form (BCNF)?

A stricter version of 3NF where every determinant is a candidate key. Signup and view all the answers

What is the difference between a super key and a candidate key?

A super key is a set of attributes that uniquely identifies a tuple, while a candidate key is a minimal super key. Signup and view all the answers

Define Non-prime attributes in the context of database normalization.

Non-prime attributes are attributes that are not part of any candidate key. Signup and view all the answers

What is Boyce Codd Normal Form (BCNF), and how does it relate to 3NF?

BCNF is an advanced version of 3NF that deals with certain types of anomalies that can arise in 3NF. Signup and view all the answers

Explain the concept of Transitive Functional Dependency.

Transitive Functional Dependency occurs when a non-prime attribute is functionally dependent on another non-prime attribute. Signup and view all the answers

How would you identify a candidate key in a table?

A candidate key is a minimal super key, meaning it should be a super key without any extraneous attributes. Signup and view all the answers

Flashcards

Super Key

A set of attributes that uniquely identifies each tuple in a relation.

Third Normal Form (3NF)

A level of database normalization that eliminates transitive functional dependencies.