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Relational Algebra Basics - 2 Video Lecture | Question Bank for GATE Computer Science Engineering - Computer Science Engineering (CSE)
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FAQs on Relational Algebra Basics - 2 Video Lecture - Question Bank for GATE Computer Science Engineering - Computer Science Engineering (CSE)
| 1. What is relational algebra? |  |
Relational algebra is a procedural query language used to retrieve and manipulate data stored in relational databases. It provides a set of operations that can be performed on relational tables, such as selection, projection, union, intersection, difference, join, and division.
| 2. What are the basic operations in relational algebra? | |
The basic operations in relational algebra include selection, projection, union, intersection, difference, join, and division.
- Selection is used to retrieve rows that satisfy a certain condition.
- Projection is used to retrieve specific columns from a table.
- Union combines two tables and outputs all distinct rows from both tables.
- Intersection outputs only the rows that are common to both tables.
- Difference outputs the rows that are present in one table but not in the other.
- Join combines two tables based on a common attribute or condition.
- Division is used to find all possible combinations of rows from one table that, when joined with another table, produce a certain result.
| 3. How is relational algebra different from SQL? | |
Relational algebra is a procedural query language, while SQL (Structured Query Language) is a declarative query language. In relational algebra, the focus is on specifying how to retrieve and manipulate data, whereas in SQL, the focus is on specifying what data to retrieve without specifying the specific steps to achieve it. SQL is more user-friendly and widely used in practice, while relational algebra provides a theoretical foundation for understanding and implementing database systems.
| 4. What is the purpose of the join operation in relational algebra? | |
The join operation in relational algebra is used to combine two tables based on a common attribute or condition. It retrieves all the rows from both tables that satisfy the join condition and combines them into a new table. Join is useful for retrieving related data from multiple tables and is a fundamental operation in database systems.
| 5. How is division operation used in relational algebra? | |
The division operation in relational algebra is used to find all possible combinations of rows from one table that, when joined with another table, produce a certain result. It is typically used to solve complex queries involving multiple tables. The division operation is performed by first joining the two tables, then projecting the desired columns, and finally selecting the rows that satisfy the desired condition.
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