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select LISTAGG(v, ',') from ( select 1 id, 'Student' v from dual union all select 2, 'Admin' v from dual union all select 3, 'LBC' v from dual union all select 2, 'LBC' v from dual union all select 4, 'Examinator' v from dual union all select 5, 'PO' v from dual) group by id
LISTAGG(V,',')
Admin,LBC
Examinator
LBC
PO
Student