SQL: Group data by weeks

– Group by weeks
starting on Mondays

select count(OrderID) as numOrders,

min(dateadd(day, datediff(day,’19000101′,OrderDate)/7*7, ‘19000101’)) as WeekStarting,

min(OrderDate) as EarliestOrder, max(OrderDate) as LatestOrder from
Northwind..Orders

group by datediff(day,’19000101′,OrderDate)/7

order by WeekStarting

 

via [SQLTeam]

 

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