–donne la liste des clés étrangères
select owner,constraint_name,constraint_type,table_name,r_owner,r_constraint_name
  from all_constraints
 where constraint_type=’R’ and R_OWNER=’nom_du_schéma’
   and r_constraint_name in (select constraint_name
                               from all_constraints
                              where constraint_type in (‘P’,’U’)
                                and table_name=’nom_de_la_table’);