GROUP_CONCAT DISTINCT BY ID

Question

I have 2 tables like this:
Table a:

ID  type
1    1
1    1
2    1

2    2
2    2
3    2

Table b:

ID  name
1    a
2    b
3    b

And expected result:

ID   type  name
1,2   1    a,b
2,3   2    b,b

I have tried:

SELECT GROUP_CONCAT(DISTINCT ID), a.type,
GROUP_CONCAT(SELECT name FROM b WHERE ID = a.ID)
FROM a GROUP BY a.type

but it's not working. I need name is GROUP_CONCAT and DISTINCT by ID.

Answer 1

I have found a solution for my question:

SELECT GROUP_CONCAT(DISTINCT a.id), a.type, 
(SELECT GROUP_CONCAT(name) FROM b
WHERE FIND_IN_SET(ID, GROUP_CONCAT(a.ID)))
FROM a GROUP BY a.type

Answer 2

Try this one:

SELECT GROUP_CONCAT(DISTINCT a.id), a.type, GROUP_CONCAT(DISTINCT b.name)
FROM a
LEFT JOIN b ON a.id = b.id
GROUP BY a.type