Test Your Knowledge of DDL, DML, DCL, DQL and TCL in SQL

Test Your Knowledge of DDL, DML, DCL, DQL and TCL in SQL with our Multiple Choice Questions (MCQ’s)

In our last blog post we have gone through in detail on DDL (Data Definition Language), DML (Data Manipulation Language), DCL (Data Control Language), DQL (Data Query Language) and TCL (Transaction Control Language) is fundamental in SQL (Structured Query Language), which are the key components and sub-languages of Structured Query Language (SQL).

Please read the blog on DDL, DML, DCL, DQL and TCL and their common commands. Click here to go to the blog.

Test your understanding of SQL sub-languages – DDL, DML, DCL, DQL and TCL and their commands with these multiple-choice questions (MCQs).

Question 1: What does DDL stand for in SQL?

A. Data Description Language
B. Data Definition Language
C. Data Deletion Language
D. Data Design Language

Answer: B

Explanation: DDL stands for Data Definition Language. DDL commands are used to define and manage the structure of the database. CREATE, ALTER, DROP and TRUNCATE are the commands of Data Definition Language (DDL).

Question 2: Which DDL command is used to remove all records from a table without modifying its structure?

A. CREATE
B. ALTER
C. DROP
D. TRUNCATE

Answer: D

Explanation: The TRUNCATE command is used to remove all records (rows) from a table without changing its structure. Remember, Records are also referred to as rows. Each row represents a single record in a database table.

Question 3: What is the primary purpose of DML in SQL?

A. To define database objects
B. To manipulate or modify stored data
C. To control user access
D. To query and retrieve data

Answer: B

Explanation: DML (Data Manipulation Language) is used to manipulate or modify the stored data in the database. INSERT, UPDATE and DELETE are the commands of DML (Data Manipulation Language).

Question 4: Which DML command is used to add new records (rows) into a table?

A. SELECT
B. INSERT
C. UPDATE
D. DELETE

Answer: B

Explanation: The INSERT command is used to add new records (rows) into a table.

Question 5: What is the main purpose of DCL commands in SQL?

A. To create tables and views
B. To manipulate data
C. To set permissions and access control
D. To query data

Answer: C

Explanation: DCL (Data Control Language) commands are used to set permissions and access control for users. GRANT and REVOKE are the commands of DCL (Data Control Language).

Question 6: Which DCL command allows setting specific permissions for users to perform actions on database objects?

A. GRANT
B. REVOKE
C. CREATE
D. ALTER

Answer: A

Explanation: The GRANT command allows setting specific permissions for users to perform actions on database objects.

Question 7: What does DQL stand for in SQL?

A. Data Description Language
B. Data Definition Language
C. Data Deletion Language
D. Data Query Language

Answer: D

Explanation: DQL stands for Data Query Language, which is responsible for querying and retrieving data from the database. SELECT is a command of Data Query Language (DQL).

Question 8: Which DQL command is used to retrieve data from one or multiple tables?

A. CREATE
B. ALTER
C. INSERT
D. SELECT

Answer: D

Explanation: The SELECT command is used to retrieve data from one or multiple tables.

Question 9: What is the primary purpose of TCL commands in SQL?

A. To define database objects
B. To manipulate or modify stored data
C. To set permissions and access control
D. To manage and control transactions

Answer: D

Explanation: TCL (Transaction Control Language) commands are used to manage and control transactions in the database.

Question 10: Which TCL command is used to save all the changes made in a transaction?

A. COMMIT
B. ROLLBACK
C. SAVEPOINT
D. GRANT

Answer: A

Explanation: The COMMIT command is used to save all the changes made in a transaction. COMMIT, ROLLBACK and SAVEPOINT are the commands of the Transaction Control Language (TCL).

Question 11: What does “SQL” stand for?

A. Structured Query Language
B. Sequential Query Language
C. System Query Language
D. Standard Query Language

Answer: A

Explanation: SQL stands for Structured Query Language. SQL is used for managing and querying databases.

Question 12: Which SQL sub-language is primarily used for setting permissions and access control for users?

A. DDL (Data Definition Language)
B. DML (Data Manipulation Language)
C. DCL (Data Control Language)
D. DQL (Data Query Language)

Answer: C

Explanation: DCL (Data Control Language) commands are used for setting permissions and access control in SQL. GRANT and REVOKE are the commands of DCL (Data Control Language).

Question 13: Which SQL command is used to retrieve specific columns of data from a table?

A. INSERT
B. UPDATE
C. SELECT
D. DELETE

Answer: C

Explanation: The SELECT command is used to retrieve date from specific columns from a table.

Question 14: What is the primary purpose of the ROLLBACK command in SQL?

A. To commit changes to the database
B. To undo changes made in a transaction
C. To retrieve data from tables
D. To create new database objects

Answer: B

Explanation: The ROLLBACK command is used to undo changes made in a transaction and revert the database to its previous state.

Question 15: Which SQL command is used to permanently remove a table and its data from the database?

A. CREATE
B. ALTER
C. DROP
D. TRUNCATE

Answer: C

Explanation: The DROP command is used to permanently remove a table and its data from the database.

Don’t forget to read our detailed blog on DDL (Data Definition Language), DML (Data Manipulation Language), DCL (Data Control Language), DQL (Data Query Language) and TCL (Transaction Control Language) and their common commands. Click here to visit the blog page.