将两个UPDATE语句与一个带有WHERE子句的SET语句和一个不带的SET组合在一起

Question

是否可以将此查询合并到一个UPDATE语句中？

UPDATE [dbo].[MyTable]
SET Column1 = Column2

UPDATE [dbo].[MyTable]
SET Column3 = 1
WHERE Column1 IS NOT NULL

感谢。

Answer 1

UPDATE [DBO].[MyTable]
SET Column1 = Column2,
    Column3 = (
  CASE
    WHEN Column1 IS NOT NULL
    THEN 1
    ELSE Column3
  END)

Answer 2

这应该适合你：

UPDATE [dbo].[MyTable]
SET Column1 = Column2
    ,Column3 = 
    case 
         when Column1 IS NOT NULL THEN 1
         else Column3 
     end