Oracle: list foreign key constraints

ora_fk.sql

select
    col.table_name || '.' || col.column_name as foreign_key,
    rel.table_name || '.' || rel.column_name as references
from
    user_tab_columns col
    join user_cons_columns con 
      on col.table_name = con.table_name 
     and col.column_name = con.column_name
    join user_constraints cc 
      on con.constraint_name = cc.constraint_name
    join user_cons_columns rel 
      on cc.r_constraint_name = rel.constraint_name 
     and con.position = rel.position
where
    cc.constraint_type = 'R'
    ;