DO $$
BEGIN
 	ALTER TABLE ORGAO_CONCEDENTE ADD TAXA_CONVENIENCIA_SVI NUMBER(7,2);
  EXCEPTION WHEN duplicate_column THEN NULL;
END
$$
/
DO $$
BEGIN
 	ALTER TABLE BOLETO ADD TAXA_CONVENIENCIA_SVI NUMBER(7,2);
  EXCEPTION WHEN duplicate_column THEN NULL;
END
$$