修改欄位型別
ALTER TABLE EXP_F_CONPAY MODIFY (BLUEBILL NVARCHAR2(200));
修改欄位長度
ALTER TABLE EXP_F_CONPAY
ADD TEMP_RATE NUMBER(18, 6);
UPDATE EXP_F_CONPAY t
SET t.TEMP_RATE = (SELECT EXP_F_CONPAY.RATE
FROM EXP_F_CONPAY
WHERE EXP_F_CONPAY.TASKID = t.TASKID);