EXCEPT ALL equivalent in MySQL

Question

So I have a table called members and another table called group.The leader of the group is also a member

To retrieve members,who are not leaders I did the following code

Answer 1

SELECT first_name, last_name, rank
FROM members 
LEFT OUTER JOIN groups ON gid=leader
WHERE leader is null

Not sure if leader or gid is in the groups table. The column that is in the groups table must have a null check in the where clause.