Rigorous Mysql Test - 84+ MCQs: MySQL test: Assess Your Database Skills with MySQL Questions and Answers

1. What is the purpose of the MySQL ROLLBACK statement?

To save changes made during a transaction

To cancel a transaction and undo changes made

To create a new table

To delete data from a table

2. Which MySQL data type is used to store large text values?

VARCHAR

INT

TEXT

BOOLEAN

3. Which SQL clause is used to sort the result set in ascending order?

ORDER BY

GROUP BY

HAVING

WHERE

4. What is a subquery in MySQL?

A query that retrieves data from multiple tables

A query used to create a new table

A query nested within another query

A query that updates data in a table

5. Which SQL statement is used to add new rows of data to a table?

INSERT INTO

UPDATE

DELETE FROM

CREATE TABLE

6. Which MySQL data type is used to store a date and time?

DATE

TIME

DATETIME

TIMESTAMP

7. Which SQL operator is used to filter rows that meet multiple conditions?

AND

NOT

8. Which SQL keyword is used to retrieve all columns from a table?

ALL

EVERY

SELECT *

FETCH ALL

9. What is the purpose of an SQL index?

To store large amounts of data

To improve the speed of data retrieval operations

To encrypt sensitive data

To create a backup of the database

10. Which SQL operator is used to filter rows that meet at least one of multiple conditions?

AND

NOT

11. What is a foreign key in MySQL?

A key used to open a foreign database

A primary key of another table that is used to establish a link between the tables

A key used to encrypt data

A unique identifier for a row in a table

12. What is the purpose of the SQL GROUP_CONCAT() function?

To concatenate values from multiple columns

To count the number of rows in a table

To create a new group of rows

To filter rows based on a condition

13. Which SQL function is used to calculate the average value of a numeric column?

COUNT()

SUM()

AVG()

MAX()

14. What is the purpose of the SQL DISTINCT keyword?

To delete duplicate rows from a table

To filter rows based on a condition

To select all columns in a table

To retrieve unique values from a column

15. What is the purpose of the SQL WHERE clause?

To specify which columns to retrieve

To filter rows based on a condition

To order the result set

To join multiple tables

16. Which SQL statement is used to delete a table's structure and data?

DROP DATABASE

DELETE TABLE

TRUNCATE TABLE

DROP TABLE

17. What is a MySQL index hint?

A suggestion to the query optimizer on how to use indexes

A type of primary key

A hardware device

A stored procedure

18. What is the difference between INNER JOIN and LEFT JOIN in MySQL?

There is no difference

INNER JOIN only returns matching rows, while LEFT JOIN returns all rows from the left table

LEFT JOIN only returns matching rows, while INNER JOIN returns all rows from the left table

INNER JOIN is used for text data, while LEFT JOIN is used for numeric data

19. Which SQL function is used to count the number of rows in a table?

COUNT()

SUM()

AVG()

MAX()

20. What is the purpose of the MySQL TRUNCATE TABLE statement?

To delete specific rows from a table

To delete all data from a table and reset the table structure

To update data in a table

To insert data into a table

21. Which SQL statement is used to update existing records in a table?

MODIFY

CHANGE

UPDATE

ALTER

22. What does the SQL JOIN operation do?

It adds a new table to the database

It combines rows from two or more tables based on a related column

It deletes rows from a table

It modifies the structure of a table

23. What SQL function is used to find the highest value in a column?

COUNT()

SUM()

AVG()

MAX()

24. What is the purpose of the SQL INNER JOIN clause?

To include all rows from both tables in the result set

To include only the rows that have matching values in both tables

To exclude rows that have matching values in both tables

To filter rows based on a condition

25. In SQL, what is the purpose of the JOIN ON clause?

To specify the columns to be included in the result set

To specify the tables to be joined

To specify the conditions for joining two or more tables

To order the result set

26. What is a MySQL trigger?

A type of stored procedure

A hardware device

A type of table

A notification that is generated when a specific event occurs in the database

27. What is the purpose of the SQL GROUP BY clause?

To filter rows based on a condition

To join multiple tables

To aggregate data and group rows by a specified column

To sort the result set

28. Which command is used to create a new database in MySQL?

CREATE TABLE

CREATE DATABASE

CREATE SCHEMA

CREATE RECORD

29. Which SQL operator is used to combine rows from two or more tables based on a related column between them?

AND

NOT

JOIN

30. Which SQL keyword is used to sort the result set in descending order?

ORDER DESC

DESCENDING

DESC

SORT DESC

MySQL MCQ Test 3