Sql Server 检索多条记录的最后日期

Question

我有一个包含 5 列的表格 Emp、Surname、CSD、Term Rsn 和 Date。前 4 列将保持不变，但日期会改变，例如。 Emp 可以有 30 条记录，其中包含 30 个不同的日期。

这是我的代码，但是当我将 [Date] 添加到选择中时，它会返回所有 30 条记录，而我试图返回带有最后日期的一条记录

Create  PROCEDURE testPro(    
@reportStartDate date,
@reportEndDate date    
)    
AS
BEGIN    


SELECT DISTINCT Emp, Surname, CSD, CASE WHEN CSD<= @reportStartDate
THEN 

CASE WHEN [Term Rsn] != 0 THEN
CASE WHEN [Date] <= @reportEndDate THEN
(DATEDIFF(dd,@reportStartDate, [Date]) - (2* 
DATEDIFF(wk,@reportStartDate,[Date])))+1 ELSE (DATEDIFF(dd,@reportStartDate, @reportEndDate) - (2* 
DATEDIFF(wk,@reportStartDate,@reportEndDate)))+1 END  ELSE (DATEDIFF(dd,@reportStartDate, @reportEndDate) - (2* 
DATEDIFF(wk,@reportStartDate,@reportEndDate)))+1 END


ELSE 

CASE WHEN [Term Rsn] != 0 THEN 
CASE WHEN [Date] <= @reportEndDate THEN
(DATEDIFF(dd,CSD, [Date]) - (2* 
DATEDIFF(wk,CSD,[Date])))+1 ELSE (DATEDIFF(dd,CSD, @reportEndDate) - (2* 
DATEDIFF(wk,CSD,@reportEndDate)))+1 END ELSE (DATEDIFF(dd,CSD, @reportEndDate) - (2* 
DATEDIFF(wk,CSD,@reportEndDate)))+1 END 

END AS [Working Days]

FROM GyPremiumsTemp
WHERE CSD < @reportEndDate AND [Date] >  @reportStartDate --AND [Date] = (select max([Date]) FROM GyPremiumsTemp)
ORDER BY Emp ASC
END


    EXEC  testPro '2012-01-01', '2012-12-31'

Answer 1

选择日期字段时，请使用： 选择 max(Date),Emp,Surname 从表 按 Emp,Surname 分组

This will give you one record per employee.I hope this helps.

Answer 2

如下写：

Create  PROCEDURE testPro(    
@reportStartDate date,
@reportEndDate date    
)    
AS
BEGIN  
select Emp, Surname, CSD,[Working Days] , Max(Date) as [Date]
From (
SELECT DISTINCT Emp, Surname, CSD, CASE WHEN CSD<= @reportStartDate
THEN 

CASE WHEN [Term Rsn] != 0 THEN
CASE WHEN [Date] <= @reportEndDate THEN
(DATEDIFF(dd,@reportStartDate, [Date]) - (2* 
DATEDIFF(wk,@reportStartDate,[Date])))+1 
ELSE (DATEDIFF(dd,@reportStartDate, @reportEndDate) - (2* 
DATEDIFF(wk,@reportStartDate,@reportEndDate)))+1 END  
ELSE (DATEDIFF(dd,@reportStartDate, @reportEndDate) - (2* 
DATEDIFF(wk,@reportStartDate,@reportEndDate)))+1 END


ELSE 

CASE WHEN [Term Rsn] != 0 THEN 
CASE WHEN [Date] <= @reportEndDate THEN
(DATEDIFF(dd,CSD, [Date]) - (2* 
DATEDIFF(wk,CSD,[Date])))+1 
ELSE (DATEDIFF(dd,CSD, @reportEndDate) - (2* 
DATEDIFF(wk,CSD,@reportEndDate)))+1 END 
ELSE (DATEDIFF(dd,CSD, @reportEndDate) - (2* 
DATEDIFF(wk,CSD,@reportEndDate)))+1 END 

END AS [Working Days],[Date] -- Add all Dates here

FROM GyPremiumsTemp
WHERE CSD < @reportEndDate AND [Date] >  @reportStartDate
) T
Group By Emp, Surname, CSD,[Working Days] 
ORDER BY Emp ASC
END


EXEC  testPro '2012-01-01', '2012-12-31'

在这里查看Demo。