Question

我尝试使用LEAD为以下sql查询中的每一行获取最大日期差异，然后按降序排序。以下是查询及其结果。我希望能够做的还包括当前日期。目前，我无法包含最近记录的事件与今天的日期之间的差异。

因此，在我想要的结果中，提前日期将是今天的日期（在非有序的当前结果查询中它是空的）。目前的情况是，最后记录的事件是2016年12月5日，这意味着最后记录的事件与今天的事件之间的差异大约是63天。

使用SQL SERVER

查询：

 Select 
 convert(varchar, CLL.Call_Log_Date, 101) as [CreatedDate], 
 convert(varchar, Lead(CLL.Call_Log_Date, 1) 
           Over (Order by CLL.Call_Log_Date DESC), 101) as [Lead],
 DATEDIFF(dd, Lead(CLL.Call_Log_Date, 1) 
          Over (Order by CLL.Call_Log_Date DESC ), CLL.Call_Log_Date) as [DIFF]
 From VMWareSM_Test.dbo.RV_CALL as CLL 
 Where CLL.IPK_Status_Ref = '1' 
 And CLL.Call_Priority_Ref IN (6,7)
 Order by [DIFF] DESC;

结果

CreatedDate           Lead             DIFF
06/24/2015         05/12/2015          43
11/20/2015         10/09/2015          42
05/13/2016         04/08/2016          35
10/09/2015         09/14/2015          25
01/13/2015         12/23/2014          21
12/22/2014         12/03/2014          19
01/08/2016         12/21/2015          18
03/02/2015         02/12/2015          18
08/23/2015         08/07/2015          16
04/08/2016         03/25/2016          14

Answer 1

使用Coalesce将NULL值替换为今天的日期。

Select 
     convert(varchar, CLL.Call_Log_Date, 101) as [CreatedDate], 
     convert(varchar, Coalesce(Lead(CLL.Call_Log_Date, 1) 
           Over (Order by CLL.Call_Log_Date DESC), GetDate()), 101) as [Lead],
     DATEDIFF(dd, Coalesce(Lead(CLL.Call_Log_Date, 1) 
          Over (Order by CLL.Call_Log_Date DESC ), GetDate()), CLL.Call_Log_Date) as [DIFF]
 From VMWareSM_Test.dbo.RV_CALL as CLL 
 Where CLL.IPK_Status_Ref = '1' 
 And CLL.Call_Priority_Ref IN (6,7)
 Order by [DIFF] DESC;

在提前期SQL查询中包含今天的日期

1 个答案: