Test Your MySQL IS NOT NULL Operator Knowledge with Our SQL Quiz

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True / False

In MySQL, the IS NOT NULL condition can be used to check if a column contains any value other than NULL.

True False

The IS NOT NULL condition is used to test for non-NULL values in a column.

True / False

Using IS NOT NULL in MySQL will return rows where the specified column has a NULL value.

True False

IS NOT NULL will return rows where the specified column does not have a NULL value.

True / False

In MySQL, SELECT * FROM table_name WHERE column_name IS NOT NULL will select only the rows where column_name is not NULL.

True False

This query will retrieve all rows from table_name where column_name has non-NULL values.

True / False

In MySQL, using IS NOT NULL on a column with an index improves query performance.

True False

Indexes can improve the performance of IS NOT NULL queries as the index can quickly locate non-NULL values.

True / False

MySQL allows the use of IS NOT NULL within the WHERE clause but not within the HAVING clause.

True False

IS NOT NULL can be used in both WHERE and HAVING clauses in MySQL.

True / False

In MySQL, the IS NOT NULL condition cannot be used with aggregate functions like COUNT().

True False

IS NOT NULL can be used with aggregate functions to filter non-NULL values, such as SELECT COUNT(column_name) FROM table_name WHERE column_name IS NOT NULL.

True / False

MySQL's IS NOT NULL condition can be used in subqueries to filter rows in the main query.

True False

IS NOT NULL can be used in subqueries to ensure that only rows with non-NULL values are returned.

True / False

In MySQL, using IS NOT NULL in a join condition is not allowed.

True False

IS NOT NULL can be used in join conditions to filter rows based on non-NULL values in the joined tables.

True / False

MySQL automatically converts IS NOT NULL conditions to optimized internal code to improve performance.

True False

MySQL's query optimizer can transform IS NOT NULL conditions to optimized internal representations to enhance performance.

Q10

True / False

In MySQL, the IS NOT NULL condition can be used to filter rows in both SELECT and UPDATE statements.

True False

IS NOT NULL can be used in both SELECT and UPDATE statements to filter rows where the specified column is not NULL.

Q11

Single Choice

Which of the following queries will return rows where the email column is not NULL?

SQL Code

SELECT * FROM users WHERE email IS NOT NULL;

SELECT * FROM users WHERE email IS NULL; SELECT * FROM users WHERE email IS NOT NULL; SELECT * FROM users WHERE email != '';SELECT * FROM users WHERE email = NULL;

The IS NOT NULL operator is used to filter rows where the column value is not NULL.

Q12

Single Choice

Given the table employees, which query retrieves rows where the salary column has a value?

SQL Code

SELECT * FROM employees WHERE salary IS NOT NULL;

SELECT * FROM employees WHERE salary > 0; SELECT * FROM employees WHERE salary IS NOT NULL; SELECT * FROM employees WHERE salary IS NULL;SELECT * FROM employees WHERE salary = NULL;

The IS NOT NULL operator checks for rows where the salary column has a non-NULL value.

Q13

Single Choice

Which of the following is a correct use of the IS NOT NULL operator?

SQL Code

SELECT * FROM orders WHERE order_date IS NOT NULL;

SELECT * FROM orders WHERE order_date != NULL; SELECT * FROM orders WHERE order_date IS NOT NULL; SELECT * FROM orders WHERE order_date IS NULL;SELECT * FROM orders WHERE order_date = '';

The correct syntax to check for non-NULL values is IS NOT NULL.

Q14

Single Choice

What will be the result of the following query?

SQL Code

SELECT COUNT(*) FROM customers WHERE phone IS NOT NULL;

It returns the total number of rows in the customers table. It returns the total number of rows where the phone column is not NULL. It returns 0 if the phone column is empty.It will return an error

This query counts the number of rows where the phone column has a non-NULL value.

Q15

Single Choice

Which of the following queries correctly filters out rows where address is NULL?

SQL Code

SELECT * FROM users WHERE address IS NOT NULL;

SELECT * FROM users WHERE address IS NULL; SELECT * FROM users WHERE address != NULL; SELECT * FROM users WHERE address IS NOT NULL;SELECT * FROM users WHERE address = '';

The query uses the IS NOT NULL operator to return rows where the address column is not NULL.

Q16

Single Choice

Which query will select records where the email field is not NULL and starts with 'a'?

SQL Code

SELECT * FROM contacts WHERE email IS NOT NULL AND email LIKE 'a%';

SELECT * FROM contacts WHERE email = 'a%' AND email IS NOT NULL; SELECT * FROM contacts WHERE email IS NOT NULL AND email LIKE 'a%'; SELECT * FROM contacts WHERE email != '' AND email LIKE 'a%';SELECT * FROM contacts WHERE email LIKE 'a%' OR email IS NOT NULL;

The query checks both that the email field is not NULL and that it starts with 'a

Q17

Single Choice

Consider a table sales with columns id, product_id, quantity, and discount. Which query returns all rows where discount is applied?

SQL Code

SELECT * FROM sales WHERE discount IS NOT NULL;

SELECT * FROM sales WHERE discount > 0; SELECT * FROM sales WHERE discount IS NOT NULL; SELECT * FROM sales WHERE discount IS NULL;SELECT * FROM sales WHERE discount != '';

The IS NOT NULL operator filters rows where the discount column is not NULL

Q18

Single Choice

What does the following SQL query return?

SQL Code

SELECT product_name FROM products WHERE stock_quantity IS NOT NULL AND price IS NOT NULL;

It returns product names with non-NULL stock_quantity. It returns product names with non-NULL price. It returns product names with both stock_quantity and price not NULL.It returns all product names

The query filters rows where both stock_quantity and price columns are not NULL

Q19

Single Choice

Given the following query, what will it return?

SQL Code

SELECT order_id FROM orders WHERE delivery_date IS NOT NULL AND delivery_date < NOW();

It returns all order IDs. It returns order IDs with non-NULL delivery_date that are in the past. ) It returns order IDs with delivery_date in the future.It will return an error.

The query returns order IDs where the delivery_date is not NULL and has already passed.

Q20

Single Choice

Which of the following statements correctly identifies records where last_login is not NULL and happened within the last 30 days?

SQL Code

SELECT user_id FROM user_log WHERE last_login IS NOT NULL AND last_login >= DATE_SUB(NOW(), INTERVAL 30 DAY);

SELECT user_id FROM user_log WHERE last_login IS NOT NULL AND last_login >= DATE_SUB(NOW(), INTERVAL 30 DAY); SELECT user_id FROM user_log WHERE last_login IS NULL AND last_login >= DATE_SUB(NOW(), INTERVAL 30 DAY); SELECT user_id FROM user_log WHERE last_login >= DATE_SUB(NOW(), INTERVAL 30 DAY);SELECT user_id FROM user_log WHERE last_login IS NOT NULL AND last_login < DATE_SUB(NOW(), INTERVAL 30 DAY);

The query filters users who have logged in within the last 30 days and ensures that the last_login field is not NULL.

Q21

Multiple Choice

Which query correctly retrieves records from the 'employees' table where the 'manager_id' is NOT NULL?

SQL Code

SELECT *
FROM employees
WHERE manager_id IS NOT NULL;

SELECT * FROM employees WHERE manager_id IS NOT NULL; SELECT * FROM employees WHERE manager_id IS NULL; SELECT * FROM employees WHERE manager_id <> NULL;SELECT * FROM employees WHERE manager_id = NULL;

The IS NOT NULL operator is used to filter rows where the 'manager_id' column does not have a NULL value.

Q22

Multiple Choice

Identify the correct SQL query that retrieves records from the 'orders' table where the 'shipped_date' is NOT NULL.

SQL Code

SELECT *
FROM orders
WHERE shipped_date IS NOT NULL;

SELECT * FROM orders WHERE shipped_date IS NOT NULL; SELECT * FROM orders WHERE shipped_date IS NULL; SELECT * FROM orders WHERE shipped_date <> NULL;SELECT * FROM orders WHERE shipped_date = NULL;

The IS NOT NULL operator filters rows where the 'shipped_date' column does not have a NULL value.

Q23

Multiple Choice

Which query correctly selects records from the 'products' table where the 'discount' column is NOT NULL?

SQL Code

SELECT *
FROM products
WHERE discount IS NOT NULL;

SELECT * FROM products WHERE discount IS NOT NULL; SELECT * FROM products WHERE discount IS NULL; SELECT * FROM products WHERE discount <> NULL;SELECT * FROM products WHERE discount = NULL;

The IS NOT NULL operator is used to filter rows where the 'discount' column does not have a NULL value.

Q24

Multiple Choice

Determine the correct SQL query that retrieves records from the 'customers' table where the 'phone_number' is NOT NULL.

SQL Code

SELECT *
FROM customers
WHERE phone_number IS NOT NULL;

SELECT * FROM customers WHERE phone_number IS NOT NULL; SELECT * FROM customers WHERE phone_number IS NULL; SELECT * FROM customers WHERE phone_number <> NULL;SELECT * FROM customers WHERE phone_number = NULL;

The IS NOT NULL operator filters rows where the 'phone_number' column does not have a NULL value.

Q25

Multiple Choice

Which SQL query retrieves records from the 'inventory' table where the 'last_restocked' date is NOT NULL?

SQL Code

SELECT *
FROM inventory
WHERE last_restocked IS NOT NULL;

SELECT * FROM inventory WHERE last_restocked IS NOT NULL; SELECT * FROM inventory WHERE last_restocked IS NULL; SELECT * FROM inventory WHERE last_restocked <> NULL;SELECT * FROM inventory WHERE last_restocked = NULL;

The IS NOT NULL operator is used to filter rows where the 'last_restocked' date is not NULL.

Q26

Multiple Choice

Which query correctly retrieves records from the 'employees' table where the 'termination_date' is NOT NULL?

SQL Code

SELECT *
FROM employees
WHERE termination_date IS NOT NULL;

SELECT * FROM employees WHERE termination_date IS NOT NULL; SELECT * FROM employees WHERE termination_date IS NULL; SELECT * FROM employees WHERE termination_date <> NULL;SELECT * FROM employees WHERE termination_date = NULL;

The IS NOT NULL operator filters rows where the 'termination_date' column does not have a NULL value.

Q27

Multiple Choice

Determine the correct SQL query that selects records from the 'payments' table where the 'transaction_id' is NOT NULL.

SELECT * FROM payments WHERE transaction_id IS NOT NULL; SELECT * FROM payments WHERE transaction_id IS NULL; SELECT * FROM payments WHERE transaction_id <> NULL;SELECT * FROM payments WHERE transaction_id = NULL;

The IS NOT NULL operator is used to filter rows where the 'transaction_id' column does not have a NULL value.

Q28

Multiple Choice

Which SQL query retrieves records from the 'clients' table where the 'email' field is NOT NULL?

SQL Code

SELECT *
FROM clients
WHERE email IS NOT NULL;

SELECT * FROM clients WHERE email IS NOT NULL; SELECT * FROM clients WHERE email IS NULL; SELECT * FROM clients WHERE email <> NULL;SELECT * FROM clients WHERE email = NULL;

The IS NOT NULL operator filters rows where the 'email' field does not have a NULL value.

Q29

Multiple Choice

Identify the correct query that retrieves records from the 'contracts' table where the 'end_date' is NOT NULL.

SQL Code

SELECT *
FROM contracts
WHERE end_date IS NOT NULL;

SELECT * FROM contracts WHERE end_date IS NOT NULL; SELECT * FROM contracts WHERE end_date IS NULL; SELECT * FROM contracts WHERE end_date <> NULL;SELECT * FROM contracts WHERE end_date = NULL;

The IS NOT NULL operator is used to filter rows where the 'end_date' column does not have a NULL value.

Q30

Multiple Choice

Which SQL query correctly retrieves records from the 'students' table where the 'graduation_date' is NOT NULL?

SQL Code

SELECT *
FROM students
WHERE graduation_date IS NOT NULL;

SELECT * FROM students WHERE graduation_date IS NOT NULL; SELECT * FROM students WHERE graduation_date IS NULL; SELECT * FROM students WHERE graduation_date <> NULL;SELECT * FROM students WHERE graduation_date = NULL;

The IS NOT NULL operator is used to filter rows where the 'graduation_date' column does not have a NULL value.

MySQL Database Quiz Questions