
DBMS

Quiz
•
Other
•
University
•
Medium
Vishva V
Used 3+ times
FREE Resource
20 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What is a relation in the context of relational databases?
A table with no rows
A table with only one column
A table consisting of rows and columns
A table with only one row
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Which of the following is a basic operation of relational algebra?
Sorting
Filtering
Projection
Joining
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Which of the following is not an extended relational algebra operation?
Aggregate functions
Intersection
Projection
Outer Join
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What does the operation σ (sigma) represent in relational algebra?
Union
Selection
Join
Projection
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
A tuple relational calculus query returns:
A boolean value
A set of tuples
A string
A numeric value
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Which of the following SQL statements is used to modify existing data in a table?
INSERT
UPDATE
DELETE
SELECT
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What does a NULL value represent in a database?
0
Empty string
No data or missing value
A unique value
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