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

1. In SQL, what is a subquery?

A query that is run after the main query

A query that joins multiple tables

A query nested within another query

A query that retrieves all rows from a table

2. 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

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

COUNT()

SUM()

AVG()

MAX()

4. In MySQL, what is the purpose of the COMMIT statement?

To save changes made during a transaction

To cancel a transaction

To create a new table

To delete data from 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 SQL statement is used to delete data from a table?

DELETE

UPDATE

INSERT

SELECT

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

ORDER BY

GROUP BY

HAVING

WHERE

8. In SQL, what is a self-join?

A join between two tables with the same name

A join between two unrelated tables

A join that includes all rows from both tables

A join that requires a subquery

9. What is the purpose of the SQL VIEW?

To create a backup of a database

To store large amounts of data

To encapsulate a complex query into a virtual table

To add a new column to a table

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

AND

NOT

11. What SQL statement is used to retrieve data from a database?

SELECT

INSERT

UPDATE

DELETE

12. What is the purpose of the SQL LEFT 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

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

AND

NOT

JOIN

14. Which MySQL function is used to find the highest value in a column?

MAX()

MIN()

SUM()

AVG()

15. In SQL, what is the purpose of the GROUP BY clause?

To filter rows based on a condition

To order the result set

To aggregate data and group rows by a specified column

To join multiple tables

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

COUNT()

SUM()

AVG()

MAX()

17. Which SQL statement is used to add a new column to an existing table?

ALTER TABLE

MODIFY TABLE

CHANGE TABLE

UPDATE TABLE

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

COUNT()

SUM()

AVG()

MAX()

19. Which MySQL data type is used to store a date?

DATE

TIME

DATETIME

TIMESTAMP

20. What is the purpose of the 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

MySQL MCQ Test 4