IS NULL - MySQL Conditions

In MySQL, the IS NULL condition is used to test whether a value is NULL or not. In this tutorial, we'll discuss how to use IS NULL in MySQL to filter results.

Syntax

The syntax for using IS NULL in MySQL is as follows:

SELECT column1, column2, ...
FROM table_name
WHERE column_name IS NULL;

Example

Let's say we have a table called "people" with columns "id", "name", and "address". We want to select all the rows where the address column is NULL. Here's how we can implement it:

SELECT * FROM people
WHERE address IS NULL;

Output

When we run the example code above, the output will be all the rows from the "people" table where the address column is NULL.

Explanation

In the example above, we used the IS NULL condition to filter results from the "people" table. We selected all the rows where the address column is NULL. The output was all the rows from the table that meet the condition.

Use

The IS NULL condition is useful when we want to filter results based on whether a column contains NULL values or not. It can be used in conjunction with the WHERE clause to filter results based on a certain condition.

Important Points

• The IS NULL condition can only be used to test for NULL values. To test for non-NULL values, use the IS NOT NULL condition.
• The IS NULL condition is often used with the WHERE clause to filter results based on whether a column contains NULL values or not.

Summary

In this tutorial, we discussed how to use the IS NULL condition in MySQL to filter results based on whether a column contains NULL values or not. We covered the syntax, example, output, explanation, use, and important points of using IS NULL. With this knowledge, you can now use IS NULL in your MySQL queries to filter results based on NULL values.