[英]How to group by week?
我需要創建一個報告,其中需要從特定年份的第一周到最后一周的各星期的UserHits總數。
如何實現呢?
http://sqlfiddle.com/#!6/eb181/1/0
CREATE TABLE UserData
(
DateCreated dateTime2 NOT NULL,
UserHits int NOT NULL
);
insert into UserData
values
('2014-01-01',100),
('2014-01-02',50),
('2014-01-03',20),
('2014-01-20',100),
('2014-01-21',100),
('2014-01-22',70),
('2014-02-02',100),
('2014-02-03',100);
select datepart(wk, DateCreated)
, sum(UserHits)
from UserData
group by
datepart(wk, DateCreated)
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