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

1. 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

2. Which SQL statement is used to modify existing records in a table?

INSERT

UPDATE

DELETE

ALTER

3. What is the purpose of the SQL ORDER BY clause?

To filter rows based on a condition

To join multiple tables

To aggregate data

To sort the result set

4. What does the SQL DELETE statement do?

Deletes all data from a table

Deletes a table structure

Deletes specific rows from a table

Deletes a database

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

COUNT()

SUM()

AVG()

MAX()

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

AND

NOT

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

ALTER TABLE

MODIFY TABLE

CHANGE TABLE

UPDATE TABLE

8. What is the SQL statement used to change an existing table's structure?

ALTER TABLE

MODIFY TABLE

CHANGE TABLE

UPDATE TABLE

9. 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

10. 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

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

DATE

TIME

DATETIME

TIMESTAMP

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

ORDER BY

GROUP BY

HAVING

WHERE

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

CREATE TABLE

CREATE DATABASE

CREATE SCHEMA

CREATE RECORD

14. 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

15. What does SQL stand for?

Structured Query Language

Structured Query Learning

Structured Question Language

Structured Query Learn

16. 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

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

COUNT()

SUM()

AVG()

MAX()

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

SELECT

INSERT

UPDATE

DELETE

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

COUNT()

SUM()

AVG()

MAX()

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

MODIFY

CHANGE

UPDATE

ALTER

21. In MySQL, what is the purpose of the HAVING clause?

To filter rows before grouping

To order the results

To delete rows from a table

To create a new table

22. Which SQL statement is used to add a new row to a table?

INSERT INTO

ADD ROW

CREATE ROW

ADD RECORD

23. What is the purpose of the MySQL EXPLAIN statement?

To display information about the database schema

To explain the purpose of a query

To create a new table

To execute a stored procedure

24. 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

25. 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

26. In SQL, what is an aggregate function?

A function that performs mathematical calculations

A function that combines rows from multiple tables

A function that counts the number of rows in a table

A function that operates on a set of values and returns a single value

27. Which SQL statement is used to delete data from a table?

DELETE

UPDATE

INSERT

SELECT

28. In SQL, what is a foreign key?

A key used to sort rows in a table

A key that uniquely identifies a row in a table

A key used to join multiple tables

A key that establishes a link between two tables

29. 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

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

INSERT INTO

UPDATE

DELETE FROM

CREATE TABLE

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

DROP DATABASE

DELETE TABLE

TRUNCATE TABLE

DROP TABLE

32. What is the purpose of the MySQL CHECK constraint?

To check the database for errors

To check if a column contains only numeric data

To specify a condition that must be met for data to be inserted or updated in a column

To perform a join operation

33. What is the purpose of the SQL TRUNCATE TABLE statement?

To delete all rows from a table

To add a new column to a table

To change the data type of a column

To modify the structure of a table

34. What is the SQL statement used to add a new column to an existing table?

ALTER TABLE

CREATE COLUMN

ADD COLUMN

INSERT COLUMN

35. 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

36. Which SQL clause is used to filter rows based on multiple conditions using logical operators?

WHERE

HAVING

AND

37. 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

38. Which SQL clause is used to specify conditions for grouping rows?

GROUP BY

ORDER BY

HAVING

WHERE

39. What is the purpose of the MySQL GROUP BY clause?

To sort data in ascending order

To group rows that have the same values into summary rows

To create a new table

To delete rows from a table

40. What is the purpose of the MySQL UNION operator?

To combine two or more SELECT statements into a single result set

To perform mathematical calculations

To delete rows from a table

To create a new table

MySQL MCQ Test 2