display array field as row

Dear all,

Does anyone know how to display an array data into row?
for exampla, I have data like this

conname	contype	conkey
kelas_pkey	p	{1,2}
kelas_tahun	f	{2}

And I want to to display those data above like below

kelas_pkey     p     1
kelas_pkey     p     2
kelas_tahun   f      2

Do you know any sql syntax that would do?
I cannot find it in documentation
or is it not possible?

Regards
Hendra