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Relational Algebra in Database Management

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Relational Algebra in Database Management

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Questions and Answers

What is the primary function of the SELECT operation in relational algebra?

To add new columns to a relation

To combine two relations into a single relation

To select a subset of tuples from a relation based on a condition (correct)

To eliminate duplicate tuples from a relation

What is the result of the PROJECT operation in relational algebra?

A set of distinct tuples with selected columns (correct)

A relation with all columns and duplicate tuples

A multiset of tuples with duplicate columns

A relation with all columns and no duplicate tuples

What is the property of the SELECT operation that allows multiple operations to be combined into a single operation?

Associativity

Commutativity (correct)

Selectivity

Distributivity

What is the term used to describe the fraction of tuples selected by a selection condition in relational algebra?

Selectivity Signup and view all the answers

What is the purpose of relational algebra in the relational model?

To define a set of operations for manipulating data Signup and view all the answers

What is the term used to describe a sequence of relational algebra operations?

Relational algebra expression Signup and view all the answers

The PROJECT operation is commutative.

False Signup and view all the answers

The SELECT operation can be used to deselect columns from a table.

False Signup and view all the answers

Relational Algebra in Database Management

Choose a study mode

Podcast

Questions and Answers

What is the primary function of the SELECT operation in relational algebra?

What is the result of the PROJECT operation in relational algebra?

What is the property of the SELECT operation that allows multiple operations to be combined into a single operation?

What is the term used to describe the fraction of tuples selected by a selection condition in relational algebra?

What is the purpose of relational algebra in the relational model?

What is the term used to describe a sequence of relational algebra operations?

The PROJECT operation is commutative.

The SELECT operation can be used to deselect columns from a table.

A relational algebra expression can consist of a sequence of unary and binary operations.

The term 'degree' refers to the number of tuples in a relation.

The DIVISION operation is a unary relational operation.

Relational algebra provides a basic set of operations for the relational model.

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