Unable to use LIMIT delete in mysql join query between multiple tables

Question

This is my SQL query:

DELETE gur
FROM group_master gm
JOIN group_users gu
ON gu.group_id=gm.id
JOIN group_user_roles gur
ON gur.group_user_id=gu.id
WHERE gm.school_code = 14741359 AND gm.ayid=3
LIMIT 1;

I get an error saying there is a syntax error near LIMIT. I found a solution here: DELETE using LEFT JOIN with LIMIT in MySQL. I can't convert the query into a select statement.

Answer 1

Only single tableDELETE supports LIMIT.

Use the query as a SELECT with LIMIT and get the ID of the row (remember - LIMIT without ORDER BY is a lottery). Then delete the corresponding rows from the other copy of the table.

DELETE group_user_roles 
FROM group_user_roles 
JOIN (SELECT gur.id
      FROM group_master gm
      JOIN group_users gu ON gu.group_id=gm.id
      JOIN group_user_roles gur ON gur.group_user_id=gu.id
      WHERE gm.school_code = 14741359 AND gm.ayid=3
      /* ORDER BY ??? */ LIMIT 1
      ) USING (id)

Replace id with the primary key or unique column/expression of the group_user_roles table.