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.

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

What is Boyce-Codd Normal Form (BCNF)?

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

What is denoted by the symbol F+?

<p>Closure of a set of functional dependencies</p> Signup and view all the answers

Define Third Normal Form (3NF).

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

What is a Candidate Key?

<p>A minimal super key for a relation.</p> Signup and view all the answers

Explain a Transitive Functional Dependency.

<p>When A determines B, and B determines C, then A indirectly determines C.</p> Signup and view all the answers

What is Boyce-Codd Normal Form (BCNF)?

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

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

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

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

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

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

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

Explain the concept of Transitive Functional Dependency.

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

How would you identify a candidate key in a table?

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

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