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Questions and Answers
What is the primary purpose of relational algebra?
What is the primary purpose of relational algebra?
- To optimize query performance in relational databases
- To provide a theoretical foundation for relational databases (correct)
- To define data types in relational databases
- To implement NoSQL databases
In relational algebra, what does the project operation do?
In relational algebra, what does the project operation do?
- Selects a subset of columns from a relation (correct)
- Combines tuples from two relations
- Performs set difference between two relations
- Retrieves all the tuples from a relation
Which operation in relational algebra is used to combine tuples from two relations based on a related attribute?
Which operation in relational algebra is used to combine tuples from two relations based on a related attribute?
- Project
- Union
- Join (correct)
- Select
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Study Notes
Relational Algebra
- The primary purpose of relational algebra is to provide a formal system for manipulating relational databases.
Operations in Relational Algebra
- The project operation (Ï€) selects only specific columns from a relation.
- The join operation (⋈) combines tuples from two relations based on a related attribute, allowing data to be merged from multiple tables.
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