CREATE TABLE cf_MarkNumSequence (
  partId INT NOT NULL,
  serialNumber VARCHAR(50),
  meltLotNumber VARCHAR(20),
  lastMarkNum INT DEFAULT ((0))
  PRIMARY KEY ([partId], [serialNumber], [meltLotNumber]),
  FOREIGN KEY (partId) REFERENCES cf_Part (id) ON DELETE CASCADE ON UPDATE CASCADE
);

ALTER TABLE cf_Stamp DROP COLUMN lastMarkNum;