12 Questions
What is the primary function of the SELECT operation in relational algebra?
To select a subset of tuples from a relation based on a condition
What is the result of the PROJECT operation in relational algebra?
A set of distinct tuples with selected columns
What is the property of the SELECT operation that allows multiple operations to be combined into a single operation?
Commutativity
What is the term used to describe the fraction of tuples selected by a selection condition in relational algebra?
Selectivity
What is the purpose of relational algebra in the relational model?
To define a set of operations for manipulating data
What is the term used to describe a sequence of relational algebra operations?
Relational algebra expression
The PROJECT operation is commutative.
False
The SELECT operation can be used to deselect columns from a table.
False
A relational algebra expression can consist of a sequence of unary and binary operations.
True
The term 'degree' refers to the number of tuples in a relation.
False
The DIVISION operation is a unary relational operation.
False
Relational algebra provides a basic set of operations for the relational model.
True
Test your knowledge of relational algebra operations, including unary and binary operators, SELECT, PROJECT, JOIN, and DIVISION. Learn about the relational model and set theory.
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