Prøv dette, hvis du bruger oracle 11g
SELECT
C1,
LISTAGG(C2, ',') as C2,
C3
from
tbl
GROUP BY
C1,C1
Prøv dette, hvis du bruger oracle 11g
SELECT
C1,
LISTAGG(C2, ',') as C2,
C3
from
tbl
GROUP BY
C1,C1