CREATE TABLE NET08EXTRAS
(
  PROMCOD CHAR(4), 
  CODIGOEXTRA NUMBER(5),
  DESCRIPCION CHAR(200),
  PRECIO NUMBER(18,2), 
  CONSTRAINT PKNET08EXTRAS PRIMARY KEY (PROMCOD,CODIGOEXTRA), 
  CONSTRAINT FKNET08EXTRAS_PROMOCIO FOREIGN KEY (PROMCOD) REFERENCES PROMOCIO (PROMCOD) 
);