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SELECT DATEDIFF(month,'2006-10-11','2006-11-01') --·µ»Ø1
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SELECT GetDate()   --·µ»Ø2006-11-08 13:37:56.233
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SELECT DateName(weekday,Getdate()) --Wednesday
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SELECT DATEADD(week, DATEDIFF(week,'1900-01-01',getdate()), '1900-01-01')  --·µ»Ø2006-11-06 00:00:00.000
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SELECT DATEADD(week, DATEDIFF(week,0,getdate()),0)     
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SELECT DATEADD(quarter, DATEDIFF(quarter,0,getdate()), 0)—·µ»Ø2006-10-01 00:00:00.000
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select @m=case when @m between 1 and 3 then 1
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