How to use the difference function in MySQL?

In MySQL, the difference function typically refers to the NOT IN or NOT EXISTS subqueries. Both methods can be used to find the difference between two tables.

Example of the NOT IN method:

SELECT column_name(s)
FROM table1
WHERE column_name NOT IN (SELECT column_name FROM table2);

Example of the NOT EXISTS method:

SELECT column_name(s)
FROM table1
WHERE NOT EXISTS (SELECT column_name FROM table2 WHERE condition);

Please note that when using the difference function, it is important to ensure that there is a related field between the two tables for comparison and filtering.