更新并选择一个语句（带有1个WHERE子句）

Question

How can I simplify the following SQL statement to 1 WHERE clause:

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 = '')

This statement makes no sense, but it is working fine.

I just want avoid to use the WHERE clause twice.

Some ideas?

Thanks in advance! Mike

SQL Server

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 = '')

Code is working fine

Answer 1

You can use OUTPUT clause to return updated rows:

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 = '')