Question

我需要在case子句中添加where语句。我希望它根据TermDate的值运行下面的任何一个语句。

Select * 
from myTable
where id = 12345
    AND TermDate CASE  
    WHEN NULL THEN
       AND getdate() BETWEEN StartDate AND DATEADD(dd, 30, StartDate)
    ELSE
    AND GETDATE < TermDate
    END

Answer 1

为什么不使用OR条件？

SELECT * 
FROM  myTable
WHEN  id = 12345
AND   ((TermDate IS NULL AND 
        getdate() BETWEEN StartDate AND DATEADD(dd, 30, StartDate)) OR
       GETDATE() < TermDate)

Answer 2

由于我们都发布了三个确切的答案，显然太多了，这里是一个使用case when构造的版本。

使用它：

select * 
from myTable
where id = 12345
AND   case
      when TermDate IS NULL
           AND getdate() BETWEEN StartDate AND DATEADD(dd, 30, StartDate)
      then 1
      when GETDATE < TermDate
      then 1
      else 0
      end
      = 1

Answer 3

您可以使用ANDs和ORs来完成此操作。请尝试以下查询。

Select * 
From myTable
where id = 12345
AND ((TermDate IS NULL 
          AND GETDATE() BETWEEN StartDate AND DATEADD(dd, 30, StartDate)) 
    OR (GETDATE() < TermDate))

在Where子句中添加Case语句

3 个答案: