Podcast
Questions and Answers
Which of the following is an example of a binary operation in relational algebra?
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?
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?
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?
Which operation in relational algebra returns its argument relation with certain attributes left out?
What is the result of a relational-algebra operation?
What is the result of a relational-algebra operation?
What is the purpose of the select operation in relational algebra?
What is the purpose of the select operation in relational algebra?
What does the from clause in SQL do?
What does the from clause in SQL do?
Which operation allows us to combine information from any two relations?
Which operation allows us to combine information from any two relations?
What is the result of the Cartesian product of the instructor and teaches tables?
What is the result of the Cartesian product of the instructor and teaches tables?
Which operation combines a select operation and a Cartesian-Product operation into a single operation?
Which operation combines a select operation and a Cartesian-Product operation into a single operation?
What does the union operation allow us to do?
What does the union operation allow us to do?
Which operator is used in relational algebra to give a name to the result of an expression?
Which operator is used in relational algebra to give a name to the result of an expression?
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'?
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'?
What is the purpose of the rename operation in relational algebra?
What is the purpose of the rename operation in relational algebra?
