
Exploring Relational Algebra Concepts

Quiz
•
Computers
•
12th Grade
•
Hard
Siva rama krishnam raju V
Used 1+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What are the basic set operations in relational algebra?
Union, Intersection, Difference, Cartesian Product
Select, Project, Join, Rename
Sum, Average, Count, Mode
Filter, Sort, Group, Aggregate
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Explain the difference between projection and selection.
Projection filters rows; selection selects specific columns.
Projection selects specific columns; selection filters rows based on criteria.
Projection combines multiple tables; selection sorts data.
Projection aggregates data; selection groups data.
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
How do union and intersection operations differ in relational algebra?
Union and intersection both return all tuples from the first relation.
Union removes duplicates; intersection adds new tuples from both relations.
Union combines all unique tuples from two relations; intersection finds common tuples.
Union finds common tuples; intersection combines all unique tuples.
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What is the purpose of the difference operation in relational algebra?
To retrieve tuples that are in one relation but not in another.
To count the number of tuples in a relation.
To sort tuples in a relation.
To combine two relations into one.
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Define the Cartesian product in the context of relational algebra.
The Cartesian product selects tuples from one relation based on conditions from another.
The Cartesian product of two relations R and S is a relation that contains all possible pairs of tuples (r, s) where r is from R and s is from S.
The Cartesian product is the sum of two relations.
The Cartesian product combines two relations by merging their attributes.
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Provide an example of a projection operation on a relation.
Projection of 'Employees' relation to get 'Salary' and 'Location'.
Projection of 'Employees' relation to get 'ID' and 'Email'.
Projection of 'Employees' relation to get 'Position' and 'Hire Date'.
Projection of 'Employees' relation to get 'Name' and 'Department'.
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What is the result of performing a union operation on two relations?
The result is a relation that excludes all tuples from both relations.
The result is a relation that only includes tuples from the first relation.
The result is a relation containing all tuples from both relations, including duplicates.
The result is a relation containing all unique tuples from both relations.
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