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Database Systems 13: Normalization and First Normal Form

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Database Systems 13: Normalization and First Normal Form

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Questions and Answers

What is the primary requirement for a table to be in 1NF?

Each row must have a unique combination of values. (correct)

All attributes must be dependent on the primary key.

It must not have any partial dependencies.

It must have a primary key.

What is the condition for a table to be in 2NF?

It is in 1NF and has no transitive dependencies.

It has a primary key and no duplicate rows.

It has a primary key and all attributes are dependent on it.

It is in 1NF and has no partial dependencies. (correct)

What is the term for an attribute whose value determines other values within a row?

Primary key

Candidate key

Determinant (correct)

Partial dependency

Why is a determinant used as a primary key in a new table?

To eliminate transitive dependencies. Signup and view all the answers

What is the characteristic of a candidate key?

It has the same characteristics as a primary key. Signup and view all the answers

What is the purpose of reassigning corresponding dependent attributes?

To identify attributes dependent on each determinant. Signup and view all the answers

What is the condition for a table to be in 3NF?

It is in 2NF and has no transitive dependencies. Signup and view all the answers

What is the purpose of converting a table to 3NF?

To eliminate transitive dependencies. Signup and view all the answers

What is the characteristic of the Boyce-Codd Normal Form?

Every determinant in the table is a candidate key. Signup and view all the answers

What is the primary reason for using higher-level normal forms?

To use them on occasion in specific situations. Signup and view all the answers