SQL DATEDIFF添加加號如果數字是正數

Question

我正在使用DATEDIFF(day, date1, date2)，它的效果很好。

如果數字是正數，並且如果數字是負數，它是否有可能具有加號，它有一個減號。

Answer 1

可以CAST或轉換輸出爲一個字符串，然後如果需要的話（負已經在那裏如果是負數添加「+」號。

Case When DATEDIFF(day, date1, date2) > 0 Then '+' Else '' End + Cast (DATEDIFF(day, date1, date2) as VarChar(10)) 

下面是一個例子

;With MyTable as 
(
    Select GETDATE() as Date1, GetDate()+10 as Date2 
) 
Select 
    Case When DATEDIFF(day, date1, date2) > 0 Then '+' Else '' End + Cast (DATEDIFF(day, date1, date2) as VarChar(10)) 
    From MyTable 


;With MyTable as 
(
    Select GETDATE() as Date1, GetDate()-10 as Date2 
) 
Select 
    Case When DATEDIFF(day, date1, date2) > 0 Then '+' Else '' End + Cast (DATEDIFF(day, date1, date2) as VarChar(10)) 
    From MyTable 

Answer 2

您可以使用

DECLARE @date1 as datetime 
DECLARE @date2 as datetime 
DECLARE @datediff as varchar(10) 
SET @date1 = GETDATE() - 10 
SET @date2 = GETDATE() - 1 
SET @datediff = DATEDIFF(day, @date1, @date2) 

SELECT Case 
    When @datediff > 0 Then '+' 
     Else '-' 
End + @datediff 

Answer 3

您可以使用條件格式：

SELECT FORMAT(DATEDIFF(day, date1, date2),'+#;-#;0') 
FROM MyTable