How to query non-null fields in MySQL?

In MySQL, you can use the IS NOT NULL operator to query fields that are not empty. The specific syntax is as follows:

SELECT column1, column2, ...
FROM table_name
WHERE column_name IS NOT NULL;

For example, to query the email field in the table named users that is not empty, you can use the following query statement:

SELECT email
FROM users
WHERE email IS NOT NULL;

This will retrieve all records where the email field is not empty.