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DBMS

Authored by Vishva V

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DBMS
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20 questions

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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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