check if mysql is empty

In MySQL, you can use IS NULL or IS NOT NULL to check whether a field is empty.

1. Use IS NULL to determine if a field is empty.
2. Retrieve all records from the table where the specific column does not have a value.
3. Use IS NOT NULL to determine if a field is not empty.
4. Retrieve all records from the table where the specified column is not empty.

In this case, table_name represents the name of the table, and column_name represents the field name to be evaluated.