Get part of the result into columns instead of lines - sql

Question

I have a query about internal and external trainings. Every training has 1 or more speakers. What I want is to have a column for every speaker.
I was checking on aggregate functions, but I couldn't find the one solving my problem.
select e.sid
, e.access_kz EXTERN1
, z.zuname VERTRETERPERSONAL1
from MDEV e
join MDEVCAL ec on (ec.klient_id = e.klient_id and ec.EV_sid = e.sid)
left outer join MDEVCALS ecs on (ecs.klient_id = e.klient_id and ecs.ev_sid = e.sid and ecs.evcal_sid = ec.sid)
left outer join MDZHD z on (z.klient_id = e.klient_id and z.sid = ecs.MDZHD_SID)
I use left outer joins because a training doesn't have to have a speaker but can have X different speakers
What I want to have is something like this:
SID | Extern1 | VERTRETERPERSONAL1 | VERTRETERPERSONAL2 | VERTRETERPERSONAL3 ...

Answer 1

I think the Following query will resolve your problem but with the static list of trainers.
SELECT
*
FROM
(
SELECT
E.SID,
E.ACCESS_KZ EXTERN1,
Z.ZUNAME VERTRETERPERSONAL
FROM
MDEV E
JOIN MDEVCAL EC ON ( EC.KLIENT_ID = E.KLIENT_ID
AND EC.EV_SID = E.SID )
LEFT OUTER JOIN MDEVCALS ECS ON ( ECS.KLIENT_ID = E.KLIENT_ID
AND ECS.EV_SID = E.SID
AND ECS.EVCAL_SID = EC.SID )
LEFT OUTER JOIN MDZHD Z ON ( Z.KLIENT_ID = E.KLIENT_ID
AND Z.SID = ECS.MDZHD_SID )
) PIVOT (
MAX ( VERTRETERPERSONAL )
FOR VERTRETERPERSONAL
IN ( '<VERTRETERPERSONAL_NAME1>' AS VERTRETERPERSONAL1, '<VERTRETERPERSONAL_NAME2>' AS VERTRETERPERSONAL2, .... )
);
Cheers!!