SQL Server，如何基于星期几求和

Question

我有一张桌子可以保持出勤率。 它包含三列：

createdby (varchar(30))
TimeSheetDate (dateTime)
Workinghours (integer)

我想查找一周中某一天的总工作时间。 例如

Monday   Tuesday    Wednesday
------------------------------
10        9         11

我很难获得基于DOW的总数。

这是我的查询：

SELECT 
    createdby,
    CASE 
        WHEN dbo.udf_DayOfWeek(TimeSheetDate) = 'Monday'  
           THEN sum(WorkingHours) as Monday 
        WHEN dbo.udf_DayOfWeek(TimeSheetDate) = 'Tuesday' 
           THEN sum(WorkingHours) as Tuesday
        WHEN dbo.udf_DayOfWeek(TimeSheetDate) = 'Wednesday' 
           THEN sum(WorkingHours) as Wednesday
        WHEN dbo.udf_DayOfWeek(TimeSheetDate) = 'Thursday' 
           THEN sum(WorkingHours) as Thursday
    End 
FROM 
    TS.TimesheetsDetails
WHERE 
    CreatedDate <= '2014-09-26' AND 
    CreatedDate >= '2014-09-19' 
GROUP BY 
    createdby, dbo.udf_DayOfWeek(TimeSheetDate)

但它不起作用，并给出错误。

任何人都可以提供适当的指导吗？ 顺便说一句，函数udf_DayOfWeek()返回星期几。

Answer 1

这看起来像是有条件的总和。 关键是列不能是条件列 ，只能是聚合内的值 。 因此，您必须将case语句放入SUM() ：

select createdby,
    sum(case when dbo.udf_DayOfWeek(TimeSheetDate)='Monday' then WorkingHours else 0 end) as Monday,
    sum(case when dbo.udf_DayOfWeek(TimeSheetDate)='Tuesday' then WorkingHours else 0 end) as Tuesday,
    ...
from TS.TimesheetsDetails
where CreatedDate between '2014-09-19' and '2014-09-26'
group by createdby

注意1：如果您也想按星期汇总，我不明白为什么要按星期几分组。 我已经删除了。

注意2：我不确定为什么要使用UDF而不是内置的DATEPART函数来获取星期几。

---

另外，您可以透视一下，看起来更干净一些：

select createdby, Monday, Tuesday, ...
from (
    select createdby, dbo.udf_DayOfWeek(TimeSheetDate) as dow, WorkingHours
    from TS.TimesheetsDetails
    where CreatedDate between '2014-09-19' and '2014-09-26'
) x
pivot (
    sum(WorkingHours)
    for dow in ([Monday],[Tuesday],...)
) p

Answer 2

尝试这个

但是我不确定

     SELECT createdby, CASE WHEN dbo.udf_DayOfWeek(TimeSheetDate)='Monday' THEN sum(WorkingHours) end as Monday,case WHEN dbo.udf_DayOfWeek(TimeSheetDate)='Tuesday' THEN sum(WorkingHours) end as Tuesday,case WHEN dbo.udf_DayOfWeek(TimeSheetDate)='Wednesday' THEN sum(WorkingHours) end as Wednesday,case  WHEN dbo.udf_DayOfWeek(TimeSheetDate)='Thursday' THEN sum(WorkingHours) end as Thursday

 FROM TS.TimesheetsDetails WHERE CreatedDate <='2014-09-26' and CreatedDate>='2014-09-19' GROUP BY createdby, dbo.udf_DayOfWeek(TimeSheetDate)`