How to select records with duplicate just one field and all other field value?

Question

i have table name = schedule

 --------------------------------------------
| course_id | room |   day  |     time     |
---------------------------         


        

Answer 1

You can use group_concat

select c.course_code,
    c.course_name,
    group_concat(concat(s.room, ',', s.day, '-', s.time) separator ';')
from course c
join schedule s on s.course_id = c.id
group by c.course_code,
    c.course_name;