with cultivate_tb as (select 101 as info_id,1 as staff_id,'course1,course2' as courseunion allselect 102,2,'course2'union allselect 103,3,'course1,course3'union allselect 104,4,'course1,course2,course3'union allselect 105 ,5 ,'course3'union allselect 106 ,6 ,NULLunion allselect 107 ,7 ,'course1,cour...