IS NOT NULL - (MySQL Conditions)

In MySQL, the IS NOT NULL condition is used to test for non-NULL values. In this tutorial, we'll discuss the syntax, example, output, explanation, use, important points, and summary of the IS NOT NULL condition in MySQL.

Syntax

The syntax for the IS NOT NULL condition is as follows:

SELECT column_name(s) FROM table_name WHERE column_name IS NOT NULL;

Example

Let's say we have a table called "students" with columns "name" and "age". Here's an example of how we can use the IS NOT NULL condition to retrieve the names of students who have an age value:

SELECT name FROM students WHERE age IS NOT NULL;

Output

When we run the example query above, the output will be a list of names from the "students" table, where the "age" column is not NULL.

Explanation

In the example above, we used the IS NOT NULL condition in our SELECT statement to retrieve the names of students from the "students" table where the "age" column is not NULL.

This means that only records where the "age" column has a value will be returned in our query result.

Use

The IS NOT NULL condition in MySQL is useful for retrieving data where a specific column has a non-null value.

For example, if you have a "users" table with columns for "name", "email", and "phone_number", and you want to retrieve all of the user names where the phone number is not null, you can use the IS NOT NULL condition to do so.

Important Points

• The IS NOT NULL condition is used to test for non-NULL values.
• The IS NOT NULL condition can be used in SELECT, UPDATE, and DELETE statements.
• The IS NOT NULL condition returns true if a column has a non-NULL value.

Summary

In this tutorial, we discussed the IS NOT NULL condition in MySQL. We covered the syntax, example, output, explanation, use, and important points of the IS NOT NULL condition in MySQL. With this knowledge, you can filter your queries to retrieve only the data you need based on non-null column values.