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Welcome to the Data Modification and Constraints MCQs Page

Dive deep into the fascinating world of Data Modification and Constraints with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Data Modification and Constraints, a crucial aspect of SQL Server. In this section, you will encounter a diverse range of MCQs that cover various aspects of Data Modification and Constraints, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within SQL Server.

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Check out the MCQs below to embark on an enriching journey through Data Modification and Constraints. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of SQL Server.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Data Modification and Constraints. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Data Modification and Constraints MCQs | Page 5 of 6

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Q41.
The UNION SQL clause can be used with ____________

a.

SELECT clause only

b.

DELETE and UPDATE clauses

c.

UPDATE clause only

d.

All of the mentioned

Discuss
Answer: (a).SELECT clause only
Q42.
Find all the tuples having temperature greater than ‘Paris’.

a.

SELECT * FROM weather
WHERE temperature > (SELECT temperature FROM weather WHERE city = ‘Paris’

b.

SELECT * FROM weather
WHERE temperature > (SELECT * FROM weather WHERE city = ‘Paris’)

c.

SELECT * FROM weather
WHERE temperature > (SELECT city FROM weather WHERE city = ‘Paris’)

d.

SELECT * FROM weather
WHERE temperature > ‘Paris’ temperature

Discuss
Answer: (a).SELECT * FROM weather
WHERE temperature > (SELECT temperature FROM weather WHERE city = ‘Paris’
Q43.
Which of the following is not a class of constraint in SQL Server?

a.

NOT NULL

b.

CHECK

c.

NULL

d.

UNIQUE

Discuss
Answer: (c).NULL
Q44.
Point out the correct statement.

a.

CHECK constraints enforce domain integrity

b.

UNIQUE constraints enforce the uniqueness of the values in a set of columns

c.

In a UNIQUE constraint, no two rows in the table can have the same value for the columns

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q45.
Which of the following constraint does not enforce uniqueness?

a.

UNIQUE

b.

Primary key

c.

Foreign key

d.

None of the mentioned

Discuss
Answer: (c).Foreign key
Q46.
Constraints can be applied on ___________

a.

Column

b.

Table

c.

Field

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q47.
Point out the wrong statement.

a.

Table constraints must be used when more than one column must be included in a constraint

b.

A column constraint is specified as part of a column definition and applies only to that column

c.

A table constraint is declared independently from a column definition and can apply to more than one column in a table

d.

Primary keys allow for NULL as one of the unique values

Discuss
Answer: (d).Primary keys allow for NULL as one of the unique values
Q48.
Purpose of foreign key constraint in SQL Server is __________

a.

FOREIGN KEY constraints identify and enforce the relationships between tables

b.

A foreign key in one table points to a candidate key in another table

c.

You cannot insert a row with a foreign key value, except NULL, if there is no candidate key with that value

d.

None of the mentioned

Discuss
Answer: (a).FOREIGN KEY constraints identify and enforce the relationships between tables
Q49.
Which of the following is not a foreign key constraint?

a.

NO ACTION

b.

CASCADE

c.

SET NULL

d.

All of the mentioned

Discuss
Answer: (b).CASCADE
Q50.
Which of the following foreign key constraint specifies that the deletion fails with an error?

a.

NO ACTION

b.

CASCADE

c.

SET NULL

d.

All of the mentioned

Discuss
Answer: (a).NO ACTION
Page 5 of 6

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