GD GOODTAX

 CREATE TABLE gd_goodtax
 (
   goodkey       dintkey,        /* Ссылка на товар              */
   taxkey        dintkey,        /* Ссылка на налог              */
   datetax       ddate NOT NULL,  /* Дата принятия налога         */
   rate          dcurrency       /* Ставка                       */
 );

 ALTER TABLE gd_goodtax ADD CONSTRAINT gd_pk_goodtax
   PRIMARY KEY (goodkey, taxkey, datetax);

 ALTER TABLE gd_goodtax ADD CONSTRAINT gd_fk_goodtax_goodkey
   FOREIGN KEY (goodkey) REFERENCES gd_good(id)
   ON DELETE CASCADE
   ON UPDATE CASCADE;

 ALTER TABLE gd_goodtax ADD CONSTRAINT gd_fk_goodtax_taxkey
   FOREIGN KEY (taxkey) REFERENCES gd_tax(id)
   ON DELETE CASCADE
   ON UPDATE CASCADE;