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

1. In MySQL, what is the primary key used for?

To uniquely identify a row in a table

To link two tables together

To store binary data

To create indexes

2. What is the result of combining two or more tables in SQL called?

Table union

Table intersection

Table combination

Table join

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

DELETE

UPDATE

INSERT

SELECT

5. Which SQL statement is used to create a new table?

CREATE TABLE

CREATE DATABASE

CREATE SCHEMA

CREATE RECORD

6. What does SQL stand for?

Structured Query Language

Structured Query Learning

Structured Question Language

Structured Query Learn

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

ORDER DESC

DESCENDING

DESC

SORT DESC

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

VARCHAR

INT

TEXT

BOOLEAN

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

ALTER TABLE

MODIFY TABLE

CHANGE TABLE

UPDATE TABLE

10. 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

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

MAX()

MIN()

SUM()

AVG()

12. What is the purpose of the SQL CASE statement?

To create a new column in a table

To perform mathematical calculations

To define conditional logic in a query

To filter rows based on a condition

13. 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

14. What is the difference between UNION and UNION ALL in MySQL?

There is no difference

UNION returns all rows, while UNION ALL returns only distinct rows

UNION ALL returns all rows, while UNION returns only distinct rows

UNION is used for text data, while UNION ALL is used for numeric data

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

ALTER TABLE

MODIFY TABLE

CHANGE TABLE

UPDATE TABLE

16. 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

17. 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

18. What is the purpose of the MySQL CASE statement?

To compare two columns in a table

To create a new table

To perform conditional logic in a query

To delete data from a table

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

ALL

EVERY

SELECT *

FETCH ALL

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

INSERT INTO

UPDATE

DELETE FROM

CREATE TABLE

21. 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

22. 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

23. Which SQL statement is used to remove a table from a database?

DELETE TABLE

DROP TABLE

REMOVE TABLE

REMOVE FROM

24. In SQL, what is the purpose of the HAVING clause?

To filter rows based on a condition

To order the result set

To join multiple tables

To filter the result set after grouping

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

AND

NOT

26. What is the purpose of the SQL SELECT statement?

To insert data into a table

To delete data from a table

To retrieve data from a database

To update data in a table

27. 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

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

COUNT()

SUM()

AVG()

MAX()

29. 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

30. What is the purpose of the MySQL JOIN clause?

To perform mathematical calculations

To filter data

To combine rows from two or more tables

To create a new database

31. Which SQL function is used to find the minimum value in a column?

COUNT()

SUM()

MIN()

MAX()

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

WHERE

HAVING

AND

33. What is a SQL view in MySQL?

A visual representation of a database schema

A virtual table that is based on the result of a SELECT query

A type of primary key

A data dictionary in MySQL

34. 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

35. What is the purpose of the SQL LIMIT clause?

To set a maximum number of columns to retrieve

To specify which columns to retrieve

To limit the number of rows in the result set

To order the result set

36. 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

37. 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

38. 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

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

MODIFY

CHANGE

UPDATE

ALTER

40. 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

MySQL MCQ Test 2