Question

Assume I have the following tables:

TABLE: foo
- foo_id (PK)

TABLE: tag
- tag_id (PK)
- name

TABLE: foo_tag
- foo_tag_id (PK)
- foo_id (FK)
- tag_id (FK)

How do I query this so that I get a result like this:

==========================
| foo_id | tags          |
==========================
| 1      | foo, bar      |
| 2      | foo           |
| 3      | bar           |
--------------------------

Basically, I need all of foo‘s tags in one column, comma separated. Possible in MySQL?

Answer 1

select f.foo_id, GROUP_CONCAT(t.name) as tags
from foo f, tag t, foo_tag as ft
where f.foo_id = ft.foo_id and ft.tag_id = t.tag_id
group by f.foo_id

http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat