Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Videos > RRB JE for Computer Science Engineering > Relational Algebra: Set Difference Operation
Relational Algebra: Set Difference Operation Video Lecture | RRB JE for Computer Science Engineering - Computer Science Engineering (CSE)
FAQs on Relational Algebra: Set Difference Operation Video Lecture - RRB JE for Computer Science Engineering - Computer Science Engineering (CSE)
| 1. What is the set difference operation in relational algebra? |  |
Ans. The set difference operation in relational algebra, denoted by $\small\text{-}$, retrieves all tuples from one relation that do not appear in another relation.
| 2. How is the set difference operation different from the intersection operation in relational algebra? | |
Ans. The set difference operation in relational algebra retrieves tuples that are exclusive to one relation, while the intersection operation retrieves tuples that are common to both relations.
| 3. Can the set difference operation be applied to relations with different schemas? | |
Ans. No, the set difference operation can only be applied to relations with the same schema, as it compares tuples based on their attributes.
| 4. What is the result of applying the set difference operation to two relations that have no common tuples? | |
Ans. If two relations have no common tuples, the result of the set difference operation will be the same as the original relation from which the operation is performed.
| 5. How can the set difference operation be useful in database queries? | |
Ans. The set difference operation can be useful for finding tuples that meet certain criteria in one relation but not in another, allowing for more precise data retrieval and analysis in database queries.
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