TSQL衝突：操作數類型衝突：日期是TINYINT不兼容

Question

我有[A-NEST BY]和[A-CUT BY]場都是datetime領域爲什麼我得到當我運行的更新

消息206，級別16，狀態2，過程NSTBY，9號線操作數類型 衝突：日期是TINYINT不兼容

SET [A-NEST BY] = 
    case DateAdd(day, -10, t1.[A-CUT BY]) 
     when 7 then DateAdd(day, -2, t1.[A-CUT BY]) 
     when 1 then DateAdd(day, -3, t1.[A-CUT BY]) 
     else t1.[A-CUT BY]-10 
    end, 

    FROM WORKORDERS T1 
     INNER JOIN inserted i ON T1.[WORK ORDER #] = i.[WORK ORDER #] 
     END 

Answer 1

實際的邏輯，使您的查詢工作將是這樣的：

UPDATE t1 
SET [A-NEST BY] = 
    DATEADD 
    (
     DAY, 
     -CASE DATEPART(WEEKDAY, t1.[A-CUT BY]) 
      WHEN 3 -- For Tuesday, ten days prior is a Saturday, so take an extra day off. 
      THEN 11 
      WHEN 4 -- For Wednesday, ten days prior is a Sunday, so take an extra two days off. 
      THEN 12 
      ELSE 10 -- Default to ten days. 
      END, 
     t1.[A-CUT BY] 
    ) 
FROM WORKORDERS T1 
INNER JOIN inserted i ON T1.[WORK ORDER #] = i.[WORK ORDER #] 

這就是說，它看起來像你是這樣做的觸發器。

例如，如果這是您的WORKORDERS表上的插入觸發器，我會建議使用計算列而不是使用觸發器（除非[A-NEST BY]日期可以更改）。