select all columns which are not in another table laravel 5.5

Question

I have two tables - the first one is called \'users\' and the second one is called \'buy_courses\'.

I am trying to select all users those user_name

Answer 1

You can use SQL's 'NOT IN'.

Example:

mysqli_query($con, "SELECT * FROM users WHERE user_name NOT IN (SELECT user_name FROM buy_courses)");