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Relational Algebra and Cartesian-Product Quiz

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Relational Algebra and Cartesian-Product Quiz

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Questions and Answers

Which of the following is an example of a binary operation in relational algebra?

union (correct)

rename

project

select

Which operation in relational algebra selects tuples that satisfy a given predicate?

union

select (correct)

project

rename

What is the result of the Cartesian product operation in relational algebra?

A new relation with all possible combinations of tuples from the input relations (correct)

A relation with distinct tuples from the input relations

A relation with tuples that have common attributes

A relation with tuples that satisfy a given predicate

Which operation in relational algebra returns its argument relation with certain attributes left out?

Project operation (A) Signup and view all the answers

What is the result of a relational-algebra operation?

A relation (A) Signup and view all the answers

What is the purpose of the select operation in relational algebra?

To filter tuples based on a condition (C) Signup and view all the answers

What does the from clause in SQL do?

Lists the relations involved in the query (B) Signup and view all the answers

Which operation allows us to combine information from any two relations?

Cartesian-Product Operation (D) Signup and view all the answers

What is the result of the Cartesian product of the instructor and teaches tables?

A new table combining the tuples of both tables (C) Signup and view all the answers

Which operation combines a select operation and a Cartesian-Product operation into a single operation?

Theta-Join Operation (D) Signup and view all the answers

What does the union operation allow us to do?

Combine two relations (D) Signup and view all the answers

Which operator is used in relational algebra to give a name to the result of an expression?

$\rho$ (A) Signup and view all the answers

Which of the following queries is equivalent to the query 'Find information about courses taught by instructors in the Physics department with salary greater than $90,000'?

$\sigma$dept_name='Physics' ($\sigma$ salary > 90,000 (instructor)) (A) Signup and view all the answers

What is the purpose of the rename operation in relational algebra?

To rename the attributes of a relation (D) Signup and view all the answers