如何避免datepart从新的一年一年的变化开始

Question

我有一个sql查询，我用它来获取每周数据。它工作正常，但当年份发生变化时，它会在4天或其他任何时间停止一周，并开始新的一周新的一周。我不想那样。我希望它像以前一样继续工作。想知道如何强制GROUP BY datepart（week，ad.xDate）

Select 'playing' As activity 
,min(ad.xDate) As xDate
,Isnull(sum(t.TimePerDay),0) As TimePerDay 
From    AllDates As ad With (Nolock) 
Left Join @test As t On ad.xDate = t.date
GROUP BY datepart(week, ad.xDate)   
ORDER BY MIN(ad.xDate)
option (maxrecursion 0)

Answer 1

GROUP BY
    DATEDIFF(week, 0, ad.xDate)