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Relational Algebra Basics - 4 Video Lecture | Question Bank for GATE Computer Science Engineering - Computer Science Engineering (CSE)
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FAQs on Relational Algebra Basics - 4 Video Lecture - Question Bank for GATE Computer Science Engineering - Computer Science Engineering (CSE)
| 1. What is relational algebra? |  |
| 2. How does selection operation work in relational algebra? | |
The selection operation in relational algebra is used to retrieve rows from a table that satisfy a specific condition. It is represented by the sigma (σ) symbol. For example, σ(age > 20)(Students) will retrieve all the rows from the Students table where the age is greater than 20.
| 3. What is the purpose of the projection operation in relational algebra? | |
The projection operation in relational algebra is used to select specific columns from a table, creating a new table with only those columns. It is represented by the pi (π) symbol. For example, π(name, age)(Students) will create a new table with only the name and age columns from the Students table.
| 4. How does the join operation work in relational algebra? | |
The join operation in relational algebra combines two or more tables based on a common attribute or condition. It is represented by the ⨝ symbol. For example, Students ⨝ Courses will combine the Students and Courses tables based on a common attribute, such as student ID, and create a new table with the combined data.
| 5. What is the difference between union and intersection operations in relational algebra? | |
The union operation in relational algebra combines rows from two tables, removing duplicates, and creates a new table with the combined data. The intersection operation, on the other hand, returns only the common rows between two tables. Union is represented by the ∪ symbol, while intersection is represented by the ∩ symbol.
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