SELECT column_names FROM table_name WHERE column_name IS NOT NULL; Below is a selection from the Customers table used in the examples: The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field:

The following SQL lists all customers with a value in the "Address" field: SELECT CustomerName, ContactName, Address FROM Customers WHERE Address IS NOT NULL; Try it Yourself » ... If you want to use W3Schools services as an educational ...

SELECT column_names FROM table_name WHERE column_name IS NOT NULL; Below is a selection from the "Customers" table in the Northwind sample database: The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field:

The following SQL adds a NOT NULL constraint on the "Age" column, after the "Persons" table is already created: ALTER TABLE Persons ALTER COLUMN Age int NOT NULL; ALTER TABLE Persons MODIFY COLUMN Age int NOT NULL; ... To remove a NOT NULL ...

String Functions: Asc Chr Concat ... SQL Study Plan SQL Bootcamp SQL Training ... The NOT NULL constraint enforces a column to not accept NULL values, which means that you cannot insert or update a record without adding a value ...

The following SQL creates a NOT NULL constraint on the "Age" column when the "Persons" table is already created: ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: sales@w3schools.com

To define a NOT NULL constraint when creating a table, add NOT NULL after the data type of the column name. The following SQL creates a "Persons" table, and ensures that the "ID", "LastName", and "FirstName" columns cannot accept NULL values:

The COALESCE() function is the preferred standard for handling potential NULL values. The COALESCE() function returns the first non-NULL value in a list of values. The COALESCE() function works in MySQL, SQL Server, and Oracle (not in MS Access).

SQL Functions SQL Avg() SQL Count() SQL First() SQL Last() SQL Max() SQL Min() SQL Sum() SQL Group By SQL Having SQL Ucase() SQL Lcase() SQL Mid() SQL Len() SQL Round() SQL Now() SQL Format() SQL Quick Ref SQL Hosting ... NULL values represent missing unknown data.

Tip: Always use IS NULL to look for NULL values. ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: sales@w3schools.com

IS NULL and NOT NULL in SQL are used to check if any field contains null values. In this tutorial, you will learn about the SQL IS NULL and NOT NULL with the help of examples.

March 13, 2023 - Using the IS NOT NULL statement as an additional parameter setting in the WHERE clause will allow us to filter out very specific data. In this SQL tutorial, we will discuss how to use the WHERE IS NOT NULL operator in SQL Server and explore some examples of using it in real-world scenarios.

This SQL tutorial explains how to use the SQL IS NOT NULL condition with syntax and examples. The IS NOT NULL condition is used in SQL to test for a non-NULL value.

You can use the IS NOT NULL operator along with the ORDER BY clause to sort results that contain only non-null values in a specific column. This helps to organize filtered results in ascending or descending order based on meaningful data. Following is the syntax of the SQL IS NOT NULL operator with ORDER BY clause:

This SQL Server tutorial explains how to use the IS NOT NULL condition in SQL Server (Transact-SQL) with syntax and examples. The SQL Server (Transact-SQL) IS NOT NULL condition is used to test for a NOT NULL value.

August 13, 2025 - Note how Mike Brown was selected because his email address is empty but not NULL. On the other hand, Jane Smith was not selected because her email is NULL. Similarly, you can apply the SQL IS NOT NULL condition multiple times to get all customers who have both a phone number and an email address:

December 29, 2023 - Here's an example SQL query that creates an "employees" table with NOT NULL constraints on the "employee_id" and "first_name" columns: CREATE TABLE employees ( employee_id INT NOT NULL, first_name VARCHAR(50) NOT NULL, last_name VARCHAR(50), date_of_birth DATE, -- Other columns ); The "employees" table is created with NOT NULL constraints on the "employee_id" and "first_name" columns.

July 23, 2025 - In this article, we will cover the syntax, use cases, and practical examples of the IS NOT NULL operator. We will also explore its application with common SQL statements like SELECT, COUNT, UPDATE, and DELETE.

February 10, 2026 - In SQL, NOT NULL constraint in SQL ensures a column must always contain a value and cannot be left empty. Unlike a PRIMARY KEY, which uniquely identifies each record and also disallows NULLs, NOT NULL only enforces the presence of data without ...

Basic SQL SyntaxThe WHERE ClauseLogical operators: AND, OR, NOTFinding similar results with LIKE and WildcardsQuerying Missing Values with IS NULL and IS NOT NULLSorting data with ORDER BYUsing LIMIT and OFFSETIN and BETWEEN