Test Your Oracle IS NOT NULL Operator Knowledge

Progress

True / False

In Oracle, the IS NOT NULL operator is used to check if a column contains a non-NULL value.

True False

The IS NOT NULL operator checks whether a column contains a non-NULL value.

True / False

The IS NOT NULL operator can be used in the WHERE clause of an Oracle SQL query.

True False

The IS NOT NULL operator is often used in the WHERE clause to filter rows where a column does not have a NULL value.

True / False

In Oracle, a column defined with a NOT NULL constraint can still be checked with the IS NOT NULL operator.

True False

Even though a column has a NOT NULL constraint, it can still be checked with the IS NOT NULL operator to confirm it does not contain NULL values.

True / False

In Oracle, you can use the IS NOT NULL operator with any data type, including numeric, character, and date types.

True False

The IS NOT NULL operator can be used with any data type to check for non-NULL values.

True / False

The IS NOT NULL operator in Oracle is case-sensitive when used with character data.

True False

The IS NOT NULL operator is not case-sensitive because it checks for the presence of a value, not the value itself.

True / False

In Oracle, you can combine the IS NOT NULL operator with logical operators like AND and OR in the WHERE clause.

True False

The IS NOT NULL operator can be combined with logical operators to form complex conditions in the WHERE clause.

True / False

In Oracle, the IS NOT NULL operator can be used in a CASE statement to handle non-NULL values.

True False

The IS NOT NULL operator can be used in a CASE statement to handle conditions where a column's value is not NULL.

True / False

In Oracle, the IS NOT NULL operator can be used in subqueries to filter rows based on non-NULL values in the subquery results.

True False

The IS NOT NULL operator can be used in subqueries to filter rows based on whether columns in the subquery contain non-NULL values.

True / False

Using the IS NOT NULL operator in Oracle with an indexed column will always result in a full table scan.

True False

While checking for non-NULL values might sometimes lead to a full table scan, if the index is specifically designed to handle NULL values, it can be used to optimize the query.

Q10

True / False

The Oracle Certified Professional (OCP) exam includes knowledge on using the IS NOT NULL operator effectively and understanding its performance implications in SQL queries.

True False

The OCP certification covers advanced topics, including the effective use of the IS NOT NULL operator and understanding its performance implications in SQL queries.

Q11

Single Choice

What is the primary use of the IS NOT NULL operator in Oracle SQL?

To check if a column value is zero To check if a column value is not NULL To compare two valuesTo select rows where a column value is NULL

The IS NOT NULL operator is used to filter rows where a column does not contain a NULL value.

Q12

Single Choice

Consider the following Oracle SQL query:What does this query return?

SQL Code

SELECT * FROM employees WHERE manager_id IS NOT NULL;

All employees Employees without a manager Employees with a non-NULL value in the manager_id columnEmployees with a NULL value in the manager_id column

This query returns rows where the manager_id column contains a non-NULL value, typically indicating employees who have a manager.

Q13

Single Choice

Which of the following statements is true about the IS NOT NULL operator in Oracle?

It can only be used with numeric columns It can only be used with string columns It can be used with any data typeIt checks if a column value is empty

The IS NOT NULL operator can be used to check for non-NULL values in columns of any data type, including strings, numbers, and dates.

Q14

Single Choice

Consider the following Oracle SQL query:What does this query return?

SQL Code

SELECT * FROM orders WHERE shipped_date IS NOT NULL;

Orders that have been shipped Orders that have not been shipped All orders regardless of shipment statusOrders with a NULL value in the shipped_date column

This query returns orders where the shipped_date column is not NULL, indicating that these orders have been shipped.

Q15

Single Choice

What will be the result of the following Oracle SQL query?

SQL Code

SELECT * FROM products WHERE price IS NOT NULL ORDER BY product_name;

Products with a NULL price, sorted by product_name Products with a non-NULL price, sorted by product_name All products sorted by product_nameProducts with a price greater than zero

The IS NOT NULL operator filters the rows to return products with a non-NULL value in the price column, and the ORDER BY clause sorts the result by product_name.

Q16

Single Choice

Consider the following Oracle SQL query:What does this query return?

SQL Code

SELECT first_name, last_name FROM employees WHERE hire_date IS NOT NULL;

Employees who have not been hired yet Employees hired on the current date Employees with a NULL value in the hire_date columnEmployees with a non-NULL value in the hire_date column

This query returns employees whose hire_date is not NULL, indicating that these employees have a recorded hire date.

Q17

Single Choice

What is the effect of using the IS NOT NULL operator in an Oracle SQL query with a subquery?

It includes rows where the column value is NULL It excludes rows where the column value is NULL It raises an error if the column contains NULL valuesIt returns all rows regardless of NULL values

The IS NOT NULL operator filters out rows where the column value is NULL, including in subqueries, returning only rows with non-NULL values.

Q18

Single Choice

Consider the following Oracle SQL query:What does this query return?

SQL Code

SELECT * FROM customers WHERE email IS NOT NULL AND phone_number IS NOT NULL;

Customers with either a NULL email or NULL phone number Customers with both NULL email and NULL phone number Customers with both a non-NULL email and a non-NULL phone numberNo customers

The query uses the AND operator to return customers where both the email and phone_number columns are not NULL.

Q19

Single Choice

How does Oracle treat NULL values when using the IS NOT NULL operator in a join condition?

NULL values are included in the join NULL values are ignored The IS NOT NULL operator can be used to specifically exclude NULL values in join conditionsThe query raises an error if NULL values are present

The IS NOT NULL operator can be applied in join conditions to exclude rows with NULL values, ensuring that only non-NULL values are considered in the join.

Q20

Single Choice

In an Oracle certification exam, you encounter the following SQL statement:What does this query return?

SQL Code

SELECT product_id, product_name FROM products WHERE category_id IS NOT NULL AND discontinued IS NOT NULL;

Products that belong to a category and are discontinued Products that do not belong to any category and are discontinued Products that belong to a category and are not discontinuedProducts that do not belong to any category and are not discontinued

This query returns products where both category_id and discontinued are not NULL, indicating that these products belong to a category and are marked as discontinued.

Q21

Multiple Choice

Which SQL code snippet correctly uses the IS NOT NULL operator to filter employees where the email address is not NULL in Oracle?

SQL Code

SELECT *
FROM employees
WHERE email IS NOT NULL;

SELECT *
FROM employees
WHERE email <> NULL;

SELECT employee_id, email
FROM employees
WHERE email IS NOT NULL;

SELECT * FROM employees WHERE email IS NOT NULL; SELECT * FROM employees WHERE email <> NULL; SELECT employee_id, email FROM employees WHERE email IS NOT NULL;SELECT * FROM employees WHERE email IS NULL;

Options A and C correctly use the IS NOT NULL operator to filter employees where the email address is not NULL. Option B incorrectly uses the inequality operator instead of IS NOT NULL.

Q22

Multiple Choice

Which SQL code snippet demonstrates how to use the IS NOT NULL operator to filter orders where the delivery date is not NULL in Oracle?

SQL Code

SELECT *
FROM orders
WHERE delivery_date IS NOT NULL;

SELECT *
FROM orders
WHERE delivery_date <> NULL;

SELECT order_id, delivery_date
FROM orders
WHERE delivery_date IS NOT NULL;

SELECT * FROM orders WHERE delivery_date IS NOT NULL; SELECT * FROM orders WHERE delivery_date <> NULL; SELECT order_id, delivery_date FROM orders WHERE delivery_date IS NOT NULL;SELECT * FROM orders WHERE delivery_date IS NULL;

Options A and C correctly use the IS NOT NULL operator to filter orders where the delivery date is not NULL. Option B incorrectly uses the inequality operator instead of IS NOT NULL.

Q23

Multiple Choice

Which SQL code snippet uses the IS NOT NULL operator to filter products where the price is not NULL in Oracle?

SQL Code

SELECT *
FROM products
WHERE price IS NOT NULL;

SELECT *
FROM products
WHERE price <> NULL;

SELECT product_id, price
FROM products
WHERE price IS NOT NULL;

SELECT * FROM products WHERE price IS NOT NULL; SELECT * FROM products WHERE price <> NULL; SELECT product_id, price FROM products WHERE price IS NOT NULL;SELECT * FROM products WHERE price IS NULL;

Options A and C correctly use the IS NOT NULL operator to filter products where the price is not NULL. Option B incorrectly uses the inequality operator instead of IS NOT NULL.

Q24

Multiple Choice

Which SQL code snippet demonstrates how to use the IS NOT NULL operator to filter customers where the phone number is not NULL in Oracle?

SQL Code

SELECT *
FROM customers
WHERE phone_number IS NOT NULL;

SELECT *
FROM customers
WHERE phone_number <> NULL;

SELECT customer_id, phone_number
FROM customers
WHERE phone_number IS NOT NULL;

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

Options A and C correctly use the IS NOT NULL operator to filter customers where the phone number is not NULL. Option B incorrectly uses the inequality operator instead of IS NOT NULL.

Q25

Multiple Choice

Which SQL code snippet uses the IS NOT NULL operator to filter inventory items where the stock quantity is not NULL in Oracle?

SQL Code

SELECT *
FROM inventory
WHERE stock_quantity IS NOT NULL;

SELECT *
FROM inventory
WHERE stock_quantity <> NULL;

SELECT item_id, stock_quantity
FROM inventory
WHERE stock_quantity IS NOT NULL;

SELECT * FROM inventory WHERE stock_quantity IS NOT NULL; SELECT * FROM inventory WHERE stock_quantity <> NULL; SELECT item_id, stock_quantity FROM inventory WHERE stock_quantity IS NOT NULL;SELECT * FROM inventory WHERE stock_quantity IS NULL;

Options A and C correctly use the IS NOT NULL operator to filter inventory items where the stock quantity is not NULL. Option B incorrectly uses the inequality operator instead of IS NOT NULL.

Q26

Multiple Choice

Which SQL code snippet demonstrates advanced use of the IS NOT NULL operator to filter sales records where the discount is not NULL in Oracle?

SQL Code

SELECT *
FROM sales
WHERE discount IS NOT NULL;

SELECT *
FROM sales
WHERE discount <> NULL;

SELECT sale_id, discount
FROM sales
WHERE discount IS NOT NULL;

SELECT * FROM sales WHERE discount IS NOT NULL; SELECT * FROM sales WHERE discount <> NULL; SELECT sale_id, discount FROM sales WHERE discount IS NOT NULL;SELECT * FROM sales WHERE discount IS NULL;

Options A and C correctly use the IS NOT NULL operator to filter sales records where the discount is not NULL. Option B incorrectly uses the inequality operator instead of IS NOT NULL.

Q27

Multiple Choice

Which SQL code snippet uses the IS NOT NULL operator to filter employees where the hire date is not NULL in Oracle?

SQL Code

SELECT *
FROM employees
WHERE hire_date IS NOT NULL;

SELECT *
FROM employees
WHERE hire_date <> NULL;

SELECT employee_id, hire_date
FROM employees
WHERE hire_date IS NOT NULL;

SELECT * FROM employees WHERE hire_date IS NOT NULL; SELECT * FROM employees WHERE hire_date <> NULL; SELECT employee_id, hire_date FROM employees WHERE hire_date IS NOT NULL;SELECT * FROM employees WHERE hire_date IS NULL;

Options A and C correctly use the IS NOT NULL operator to filter employees where the hire date is not NULL. Option B incorrectly uses the inequality operator instead of IS NOT NULL.

Q28

Multiple Choice

Which SQL code snippet demonstrates advanced use of the IS NOT NULL operator to filter order items where the shipping weight is not NULL in Oracle?

SQL Code

SELECT *
FROM order_items
WHERE shipping_weight IS NOT NULL;

SELECT *
FROM order_items
WHERE shipping_weight <> NULL;

SELECT item_id, shipping_weight
FROM order_items
WHERE shipping_weight IS NOT NULL;

SELECT * FROM order_items WHERE shipping_weight IS NOT NULL; SELECT * FROM order_items WHERE shipping_weight <> NULL; SELECT item_id, shipping_weight FROM order_items WHERE shipping_weight IS NOT NULL;SELECT * FROM order_items WHERE shipping_weight IS NULL;

Options A and C correctly use the IS NOT NULL operator to filter order items where the shipping weight is not NULL. Option B incorrectly uses the inequality operator instead of IS NOT NULL.

Q29

Multiple Choice

Which SQL code snippet uses the IS NOT NULL operator to filter departments where the department manager is not NULL in Oracle?

SQL Code

SELECT *
FROM departments
WHERE manager_id IS NOT NULL;

SELECT *
FROM departments
WHERE manager_id <> NULL;

SELECT department_id, manager_id
FROM departments
WHERE manager_id IS NOT NULL;

SELECT * FROM departments WHERE manager_id IS NOT NULL; SELECT * FROM departments WHERE manager_id <> NULL; SELECT department_id, manager_id FROM departments WHERE manager_id IS NOT NULL;SELECT * FROM departments WHERE manager_id IS NULL;

Options A and C correctly use the IS NOT NULL operator to filter departments where the department manager is not NULL. Option B incorrectly uses the inequality operator instead of IS NOT NULL.

Q30

Multiple Choice

Which SQL code snippet demonstrates the certification-level use of the IS NOT NULL operator to filter orders where the payment date is not NULL in Oracle?

SQL Code

SELECT *
FROM orders
WHERE payment_date IS NOT NULL;

SELECT *
FROM orders
WHERE payment_date <> NULL;

SELECT order_id, payment_date
FROM orders
WHERE payment_date IS NOT NULL;

SELECT * FROM orders WHERE payment_date IS NOT NULL; SELECT * FROM orders WHERE payment_date <> NULL; SELECT order_id, payment_date FROM orders WHERE payment_date IS NOT NULL;SELECT * FROM orders WHERE payment_date IS NULL;

Options A and C correctly use the IS NOT NULL operator to filter orders where the payment date is not NULL. Option B incorrectly uses the inequality operator instead of IS NOT NULL.

Oracle Database Quiz Questions