CREATE TABLE IF NOT EXISTS Loading
  (
     L_Id            INT,
     PO_Id           INT NOT NULL,
     LD_Id           INT NOT NULL,
     LE_Id           INT,
     W_Id            INT NOT NULL,
     RemainingWieght DOUBLE,
     ExpectedStart   DATETIME NOT NULL DEFAULT GETDATE(),
     ExpectedEnd     TIMESTAMP,
     LoadingStatus   ENUM('ASSIGNED', 'IN_PROCESS', 'STOPPED', 'COMPLETED'),
     PRIMARY KEY (L_Id),
     FOREIGN KEY (`PO_Id`) REFERENCES `PartOder` (`PO_Id`),
     FOREIGN KEY (`LD_Id`) REFERENCES `LoadingDock` (`LD_Id`),
     FOREIGN KEY (`LE_Id`) REFERENCES `LoadingError` (`LE_Id`),
     FOREIGN KEY (`W_Id`) REFERENCES `Weighing` (`W_Id`)
  );

ALTER TABLE MyTable
ADD CONSTRAINT DF_MyTable_MyColumn
DEFAULT GETDATE() FOR MyColumn