Podcast
Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App
Questions and Answers
What is the purpose of the select operation in relational algebra?
What is the purpose of the select operation in relational algebra?
- To find elements in one relation that are not in the other
- To find common elements between two relations
- To combine two relations
- To select specific attributes from a relation based on a condition (correct)
Which operation in relational algebra finds common elements between two relations?
Which operation in relational algebra finds common elements between two relations?
- Set difference
- Union
- Cartesian product
- Set intersection (correct)
What is the purpose of the rename operation in relational algebra?
What is the purpose of the rename operation in relational algebra?
- To select specific attributes from a relation based on a condition
- To find elements in one relation that are not in the other
- To combine two relations
- To rename the output relation (correct)
Flashcards are hidden until you start studying
Study Notes
- Relational algebra is a procedural query language that uses operators to perform queries.
- It gives a step-by-step process to obtain the result of the query.
- The select operation is denoted by σ and is used for selection prediction.
- The project operation is denoted by ∏ and is used to select specific attributes from a relation.
- The union operation combines two relations and requires the same attributes in each relation.
- The set intersection operation finds common elements between two relations.
- The set difference operation finds elements in one relation that are not in the other.
- The Cartesian product combines every tuple in one relation with every tuple in another relation.
- The rename operation is used to rename the output relation and is denoted by ρ.
- Relational algebra can also be used in join operations.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
