SELECT A.staff_id,B.staff_name FROM 
(SELECT info_id,staff_id,
IF(course LIKE '%1%',1,0) AS course1,
IF(course LIKE '%2%',1,0) AS course2,
IF(course LIKE '%3%',1,0) AS course3
FROM cultivate_tb WHERE course IS NOT NULL)A JOIN staff_tb B ON A.staff_id=B.staff_id WHERE A.course3=1