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Questions and Answers
What does the DIFFERENCE operation in relational algebra do?
What does the DIFFERENCE operation in relational algebra do?
- Multiplies the tuples in two relations together.
- Combines two relations to produce a set of tuples belonging to both.
- Combines two relations to produce a set of tuples belonging to one but not the other. (correct)
- Intersects the tuples in two relations.
What is the result of the INTERSECT operation in relational algebra?
What is the result of the INTERSECT operation in relational algebra?
- A combination of the attribute names from both input relations.
- A relation containing a set of tuples belonging to both input relations. (correct)
- A union of the tuples in both input relations.
- A relation containing a set of distinct tuples from both input relations.
In a natural join, what happens if the common attribute appears twice?
In a natural join, what happens if the common attribute appears twice?
- Both instances are considered separately in the join.
- One instance of the common attribute is randomly chosen for the join.
- The common attribute is ignored during the join.
- The common attribute is duplicated in the resulting relation. (correct)
What distinguishes an Outer Join from other types of joins?
What distinguishes an Outer Join from other types of joins?
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What is a Non-Equi Join also known as?
What is a Non-Equi Join also known as?
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