PL/SQL | Query to find Primary Key columns of a Table

select DISTINCT dc.table_name, dc.constraint_name, ucc.column_name
from dba_constraints dc,
user_cons_columns ucc
where dc.table_name = ''
and dc.constraint_type = 'P'
and dc.table_name = ucc.table_name
and dc.constraint_name = ucc.constraint_name