Data Control Language (DCL): Quiz and Practice Questions

Question 1

Which Data Control Language (DCL) statement is used to grant permissions to a user?

Accepted Answer

GRANT

Answer

REVOKE

Answer

COMMIT

Answer

ROLLBACK

Question 2

What is the correct syntax for granting SELECT permission on a table using the GRANT statement?

Accepted Answer

GRANT SELECT ON table_name TO user_name

Answer

GRANT SELECT table_name TO user_name

Answer

SELECT table_name FROM user_name

Answer

GRANT SELECT TO user_name ON table_name

Question 3

Which of the following is NOT a type of permission that can be granted or revoked using DCL?

Accepted Answer

CREATE TABLE

Answer

SELECT

Answer

UPDATE

Answer

INSERT

Question 4

What is the purpose of using a SAVEPOINT within a transaction?

Accepted Answer

To create a point in the transaction that can be rolled back to later

Answer

To commit changes made up to that point in the transaction

Answer

To grant permissions to a user within the transaction

Answer

To revoke permissions from a user within the transaction

Question 5

What is the main purpose of using a database role?

Accepted Answer

To group users with similar permissions

Answer

To create new users

Answer

To manage database objects

Answer

To control access to the database

Question 6

Which of the following is NOT a benefit of using DCL in database management?

Accepted Answer

Faster database performance

Answer

Improved security

Answer

Simplified permission management

Answer

Increased data integrity

Question 7

If a user's SELECT permission on a table is revoked, what effect does this have on roles that inherited that permission?

Accepted Answer

The roles lose the SELECT permission.

Answer

The roles keep the SELECT permission.

Answer

The roles retain SELECT permission only if granted directly.

Question 8

Which of the following SQL statements grants access to a database object?

Accepted Answer

GRANT

Answer

REVOKE

Answer

CREATE

Answer

ALTER

Question 9

Which of the following is NOT a type of database object that can be controlled using DCL?

Accepted Answer

Transactions

Answer

Tables

Answer

Views

Answer

Procedures

Question 10

Which of the following is a valid syntax for granting SELECT privileges on a table?

Accepted Answer

GRANT SELECT ON table_name TO user_name;

Answer

SELECT GRANT ON table_name BY user_name;

Answer

GRANT TO user_name SELECT ON table_name;

Answer

SELECT user_name TO GRANT ON table_name;

Question 11

What is a key difference between a privilege and a role in SQL?

Accepted Answer

Privileges grant specific permissions on objects, while roles are collections of privileges.

Answer

Roles grant specific permissions on objects, while privileges are collections of roles.

Answer

Privileges and roles are the same thing.

Answer

Roles grant privileges, while privileges grant roles.

Question 12

Which of the following is NOT a benefit of using DCL in SQL?

Accepted Answer

Increased database performance

Answer

Improved security through controlled access

Answer

Enhanced data integrity by restricting modifications

Answer

Reduced development time due to simplified permission management

Question 13

What is the purpose of the WITH GRANT OPTION clause in SQL?

Accepted Answer

To allow the grantee to grant the same privileges to other users

Answer

To prevent the grantee from granting privileges to other users

Answer

To revoke privileges from the grantee

Answer

To create a new user account

Question 14

What is the primary distinction between a schema and a user in SQL?

Accepted Answer

A schema is a collection of database objects owned by a specific user, while a user is an individual with access to the database.

Answer

A user is a collection of database objects owned by a specific schema, while a schema is an individual with access to the database.

Answer

Schemas and users are the same thing.

Answer

Schemas are owned by users, while users are owned by schemas.

Question 15

Which SQL statement is used to grant a user the privilege to create tables in a database?

Accepted Answer

GRANT CREATE TABLE TO

Answer

GRANT CREATE TABLE ON

Answer

GRANT TABLE CREATE TO

Answer

GRANT TABLE CREATE ON

Question 16

Which of the following is NOT a type of privilege that can be granted using DCL?

Accepted Answer

COMMIT

Answer

SELECT

Answer

UPDATE

Answer

DELETE

Question 17

Which of the following is a valid syntax for granting a user the SELECT privilege on all tables in a database?

Accepted Answer

GRANT SELECT ON ALL TABLES TO

Answer

GRANT SELECT ON * TO

Answer

GRANT SELECT * ON TO

Answer

GRANT SELECT ALL TABLES ON TO

Question 18

What is the purpose of using savepoints within a database transaction?

Accepted Answer

Creating a temporary checkpoint within a transaction

Answer

Rolling back the entire transaction to its beginning

Answer

Granting temporary privileges to other users

Answer

Committing changes made to the database

Question 19

What is the impact of granting the ALL PRIVILEGES privilege to a user?

Accepted Answer

The user gains all possible privileges on the database

Answer

The user can only grant privileges to other users

Answer

The user can only revoke privileges from other users

Answer

The user can only create and drop databases

Question 20

What is the key difference between a privilege and a role in SQL?

Accepted Answer

A privilege grants specific permissions to a user, while a role is a collection of privileges

Answer

A role grants specific permissions to a user, while a privilege is a collection of roles

Answer

Privileges and roles are interchangeable terms

Answer

There is no difference between a privilege and a role

Question 21

What is the correct syntax to grant SELECT permission on the 'customers' table to the user 'alice'?

Accepted Answer

GRANT SELECT ON customers TO alice

Answer

GRANT SELECT ON customers alice

Answer

alice GRANT SELECT customers

Answer

GRANT alice SELECT customers

Question 22

Which of the following is a key advantage of utilizing DCL?

Accepted Answer

Enhanced security through access control

Answer

Increased data integrity

Answer

Optimized performance

Answer

Improved data accessibility

Question 23

What is the consequence if a user attempts to access a database object without the necessary permissions?

Accepted Answer

Access is denied.

Answer

Access is granted automatically.

Answer

The system experiences a crash.

Answer

The user is prompted for a password.

Question 24

How do schemas and users differ in a database system?

Accepted Answer

A schema is a collection of objects owned by a user, while a user can own multiple schemas.

Answer

A user is a collection of objects owned by a schema, while a schema can own multiple users.

Answer

Schemas and users are interchangeable concepts.

Answer

There is no distinction between schemas and users.

Question 25

Which SQL statement is utilized exclusively for granting permissions to users in a database?

Accepted Answer

GRANT

Answer

REVOKE

Answer

COMMIT

Answer

ROLLBACK

Question 26

Which of the following options is NOT a valid type of privilege that can be granted to a user?

Accepted Answer

LOCK

Answer

SELECT

Answer

UPDATE

Answer

EXECUTE

Question 27

What is the impact of using the CASCADE option in a REVOKE statement?

Accepted Answer

It revokes the privilege from the specified user and all users to whom the privilege was granted.

Answer

It revokes the privilege from the specified user only.

Answer

It revokes all privileges from the specified user.

Answer

It creates a new user with the specified privileges.

Question 28

What is the primary function of the COMMIT statement within a database transaction?

Accepted Answer

To make changes permanent in the database.

Answer

To undo changes made within the transaction.

Answer

To initiate a new transaction.

Answer

To lock the database for exclusive access.

Question 29

Which of the following is a potential drawback of using the ROLLBACK statement?

Accepted Answer

It can lead to data inconsistency.

Answer

It can degrade database performance.

Answer

It is not supported by all database management systems.

Answer

It requires an active transaction to be present.

Question 30

Explain the distinction between a savepoint and a transaction.

Accepted Answer

Savepoints are used to mark specific points in a transaction for potential rollback, while transactions encompass the entire set of changes.

Answer

Savepoints can be created within transactions, while transactions cannot be created within savepoints.

Answer

Transactions can be rolled back, but savepoints cannot.

Answer

There is no difference between a savepoint and a transaction.

Question 31

In SQL, which statement finalizes and saves changes made to a database?

Accepted Answer

COMMIT

Answer

GRANT

Answer

ROLLBACK

Question 32

What is the effect of granting the ALL PRIVILEGES privilege to a user?

Accepted Answer

Grants complete control over all database objects, including creation, modification, and deletion.

Answer

Grants privileges only on explicitly granted objects.

Answer

Grants privileges on all objects within the current schema.

Answer

Grants privileges on all tables within the database.

Question 33

What is the main reason for using savepoints in a database transaction?

Accepted Answer

To create named checkpoints within a transaction, allowing selective rollback to those points

Answer

To automatically commit changes made during a transaction

Answer

To grant or revoke permissions on database objects

Question 34

In DCL, which statement is used to grant privileges on database objects?

Accepted Answer

GRANT

Answer

REVOKE

Answer

COMMIT

Answer

ROLLBACK

Question 35

To revoke previously granted privileges, which DCL statement should be used?

Accepted Answer

REVOKE

Answer

GRANT

Answer

COMMIT

Answer

SAVEPOINT

Question 36

To make changes made within a transaction permanent, which DCL statement is used?

Accepted Answer

COMMIT

Answer

SAVEPOINT

Answer

ROLLBACK

Answer

GRANT

Question 37

What is the primary purpose of the WITH GRANT OPTION clause in a GRANT statement?

Accepted Answer

To allow the grantee to grant the same privileges to others

Answer

To make the grant permanent

Answer

To revoke the grant if the grantor loses their privileges

Answer

To create a new user

Question 38

Which command is used to roll back a transaction?

Accepted Answer

ROLLBACK

Answer

COMMIT

Answer

SAVEPOINT

Answer

GRANT

Question 39

True or False: DCL statements can be used to modify data within a database.

Accepted Answer

False

Answer

True

Question 40

Which SQL statement is used to grant permissions on a database object?

Accepted Answer

GRANT

Answer

REVOKE

Question 41

What is the primary purpose of the REVOKE statement?

Accepted Answer

To revoke permissions on a database object

Answer

To grant permissions on a database object

Question 42

What is the correct syntax for granting the SELECT privilege on the 'customers' table to the user 'john'?

Accepted Answer

GRANT SELECT ON customers TO john

Answer

REVOKE SELECT ON customers FROM john

Question 43

Which SQL statement is used to make changes permanent in a database?

Accepted Answer

COMMIT

Answer

ROLLBACK

Question 44

What is the effect of executing a COMMIT statement?

Accepted Answer

Makes all changes permanent in the database

Answer

Reverts all changes made in the current transaction

Question 45

Which SQL statement is used to establish a point in a transaction to which you can roll back?

Accepted Answer

SAVEPOINT

Answer

CHECKPOINT

Question 46

What is the primary purpose of a savepoint?

Accepted Answer

To mark a point in a transaction to which you can roll back

Answer

To create a new transaction

Question 47

Which SQL statement is used to revert all changes made in the current transaction?

Accepted Answer

ROLLBACK

Answer

COMMIT

Question 48

What is the effect of executing a ROLLBACK statement?

Accepted Answer

Reverts all changes made in the current transaction

Answer

Makes all changes permanent in the database

Question 49

What is the purpose of the REVOKE statement in SQL?

Accepted Answer

To remove privileges from a user

Answer

To grant privileges to a user

Answer

To commit a transaction

Answer

To roll back a transaction

Question 50

What is the purpose of the COMMIT statement in SQL?

Accepted Answer

To save changes made to the database

Answer

To discard changes made to the database

Answer

To grant privileges to a user

Answer

To revoke privileges from a user

Question 51

What is the purpose of the PUBLIC role in SQL?

Accepted Answer

To grant privileges to all users

Answer

To revoke privileges from all users

Answer

To create new users

Answer

To drop databases

Question 52

Which SQL statement is used to create a new role?

Accepted Answer

CREATE ROLE

Answer

GRANT ROLE

Answer

REVOKE ROLE

Answer

ALTER ROLE

Question 53

What is the purpose of the DEFAULT keyword in a GRANT statement in SQL?

Accepted Answer

To grant privileges to all objects of a certain type

Answer

To grant privileges to a specific object

Answer

To revoke privileges from all objects of a certain type

Answer

To revoke privileges from a specific object

Question 54

Which SQL statement is used to display the privileges granted to a user?

Accepted Answer

SHOW GRANTS

Answer

REVOKE GRANTS

Answer

GRANT SHOW

Answer

REVOKE SHOW

Question 55

Which of the following is NOT a purpose of the Data Control Language (DCL)?

Accepted Answer

Rolling back changes to the database

Answer

Granting access privileges to users

Answer

Revoking access privileges from users

Answer

Committing changes to the database

Question 56

The GRANT statement is used to:

Accepted Answer

Grant access privileges to a user

Answer

Revoke access privileges from a user

Answer

Commit a transaction

Answer

Roll back a transaction

Question 57

The REVOKE statement is primarily used to:

Accepted Answer

Revoke access privileges from a user

Answer

Grant access privileges to a user

Answer

Commit a transaction

Answer

Roll back a transaction

Question 58

What is the primary purpose of the COMMIT statement?

Accepted Answer

To save changes made to the database permanently

Answer

To discard changes made to the database

Answer

To grant access privileges to a user

Answer

To revoke access privileges from a user

Question 59

Which of the following statements is NOT part of Data Control Language (DCL)?

Accepted Answer

CREATE

Answer

GRANT

Answer

REVOKE

Answer

COMMIT

Question 60

The GRANT statement is primarily used to:

Accepted Answer

Grant access permissions to database objects

Answer

Revoke access permissions from database objects

Answer

Manage transactions within a database

Answer

Create new database objects

Question 61

The primary purpose of the COMMIT statement is to:

Accepted Answer

Permanently save changes made within a transaction to the database

Answer

Temporarily store changes made within a transaction in the database

Answer

Revert changes made within a transaction, rolling it back to its previous state

Answer

Create a new transaction within the database

Question 62

To grant both SELECT and INSERT privileges on the 'students' table to the user 'alice', which of the following GRANT statements is correct?

Accepted Answer

GRANT SELECT, INSERT ON students TO alice

Answer

GRANT SELECT ON students TO alice

Answer

GRANT INSERT ON students TO alice

Answer

GRANT ALL ON students TO alice

Question 63

Which of the following options correctly revokes all privileges on the 'users' table from the user 'bob'?

Accepted Answer

REVOKE ALL ON users FROM bob

Answer

REVOKE ON users FROM bob

Answer

DENY ALL ON users TO bob

Answer

REMOVE ALL FROM users TO bob

Question 64

What is the purpose of using the WITH GRANT OPTION clause in a GRANT statement?

Accepted Answer

To grant the grantee the ability to grant the same privileges to other users

Answer

To revoke the granted privileges from the grantee

Answer

To permanently save the changes made to the database

Answer

To temporarily store the changes made to the database