更新並選擇一個語句（帶有1個WHERE子句）

Question

如何將以下SQL語句簡化為1個WHERE子句：

SELECT * 
FROM tabA 
WHERE (colCar IS NULL OR colCar = '') 
   OR (colBike IS NULL OR colBike = '') 
   OR (colTrain IS NULL OR colTrain = '')

UPDATE tabA 
SET Distance = 999 
WHERE (colCar IS NULL OR colCar = '') OR 
      (colBike IS NULL OR colBike = '') OR 
      (colTrain IS NULL OR colTrain = '')

該語句沒有任何意義，但可以正常工作。

我只想避免兩次使用WHERE子句。

有什么想法嗎？

提前致謝！ 麥克風

SQL服務器

SELECT * 
FROM tabA 
WHERE (colCar IS NULL OR colCar = '') 
   OR (colBike IS NULL OR colBike = '') 
   OR (colTrain IS NULL OR colTrain = '')

UPDATE tabA 
SET Distance = 999 
WHERE (colCar IS NULL OR colCar = '') 
   OR (colBike IS NULL OR colBike = '') 
   OR (colTrain IS NULL OR colTrain = '')

代碼工作正常

Answer 1

您可以使用OUTPUT子句返回更新的行：

UPDATE tabA 
SET Distance = 999
OUTPUT deleted.colCar
     , inserted.colCar
     , deleted.colBike
     , inserted.Distance
WHERE (colCar IS NULL OR colCar = '') OR 
      (colBike IS NULL OR colBike = '') OR 
      (colTrain IS NULL OR colTrain = '')