Postgresql: Values of multiple rows in one row - sql

Question

I have the following database:
Car: {[CarID, HorsePower, Brand, HeadDesigner]}
DesignsCar:{[CarID, DesID]}
Designer:{[DesID, Name]}
You should note that while every Car has only 1 HeadDesigner, multiple people can design cars (as in work on them).
Say I have 10 cars in my database. For CarID (1..9) only one DesID per CarID in DesignsCar.
However, for carID 10 we have 3 people working on it (carID has 3 entries in DesignsCar because 3 people worked on it).
Say I do this:
select *
from car c
left outer join designscar ds on c.carid = ds.carid
left outer join designer d on frb.persnr = r.persnr
This gives me 12 rows, when I only want 10. The reason why this gives me 12 rows should be clear: for carID 10 we have 3 people working on it (carID has 3 entries in DesignsCar because 3 people worked on it).
I hope I've done a good job explaining this problem, so here comes my question:
How do I modify the query above so I get 10 Rows. For CarID 10 I'd like the 3 designers to be written in one column (like, comma separated but anything works as long it's in one column).
Is that possible?

Answer 1

You need to aggregate the values. Here is one possibility:
select c.*,
array_agg(d.name) as designer_names
from car c left outer join
designscar ds
on c.carid = ds.carid left outer join
designer d
on frb.persnr = r.persnr
group by c.carid ; -- allowed assuming `carid` is the primary key