Question

i have a table education containing a person id and an education level id, both foreign keys. i want to group the results so each person record is singular, containing a list of all education levels, so it returns Jane Doe: master, master

select 
  concat(person.name_first," ",person.name_last) as name,
  group_concat(person_studylevel.description)
from `person_education`
left join person_studylevel on level = person_studylevel.id
left join person on junior = person.id

this worked until i added the group_concat(), it then returns an empty result set

ive tried using the result as a subquery but that didnt work as well

table structure:

person_education: id(int10), junior(int10), level(int10)
person_studylevel: id(int10), description(varchar100)
person: id(int10), name_first(varchar255), name_last(varchar255)

Answer 1

Check this out please, if you want to group by each person, then take that table as the first to the left:

• SQLFIDDLE DEMO

Query:

select 
  concat(p.name_first," ",p.name_last) as name,
  group_concat(ps.description)
from person p 
left join person_education pe
on p.id = pe.junior
left join person_studylevel ps
on pe.level = ps.id
group by p.id
;

| NAME | GROUP_CONCAT(PS.DESCRIPTION) |
---------------------------------------
|  j k |               degree,masters |
|  a g |               diploma,degree |
|  b h |                         cert |
|  c i |                       (null) |
|  d m |                       (null) |