Include null results in group_concat

Question

I have two tables like this

profile_answers

+---------+------------+
|      id | class_name |
+---------+------------+
|       1 | Class         


        

Answer 1

SELECT id,IFNULL(samples,'NULL') sample FROM 
(
    SELECT
        AA.id,
        GROUP_CONCAT(DISTINCT BB.sample) samples
    FROM
        profile_answers AA LEFT JOIN educations BB
        ON AA.id = BB.profile_answers_id
    GROUP BY AA.id
) A;