如何在周开始日期（星期一）从WeekNumber和Year TSQL

Question

嗨我有一个要求，我已经给了一个星期，一年的电话总数。

  Week Year  TotalCalls 
      1  2015   34567 
      2  2015   345353 

我想在此数据中添加weekCommence日期和月份。请教任何人如何/如果我可以通过可用数据实现这一目标？

Answer 1

为了得到当前一周的STARTINGDATE你可以使用这个公式：

SELECT DATEADD(wk, DATEDIFF(wk,0,GETDATE()), 0) MondayOfCurrentWeek 

所以，如果表中有一个CallDateTime字段，查询可能是：

select datepart(wk, CallDateTime) as Week, 
datepart(day, DATEADD(week, DATEDIFF(week, 0, CallDateTime), 0)) WeekMonday, 
datepart(day, DATEADD(week, DATEDIFF(week, 0, CallDateTime), 0)) WeekMonth, 
datepart(year, CallDateTime) as Year, 
count(*) as TotalCalls 
from CallTable 
group by datepart(wk, CallDateTime), 
datepart(day, DATEADD(week, DATEDIFF(week, 0, CallDateTime), 0)), 
datepart(day, DATEADD(week, DATEDIFF(week, 0, CallDateTime), 0)), 
datepart(year, CallDateTime)