我一直在处理从 5 个不同表中选择的查询:
SELECT R.[Name],
P.[Name],
S.[Number],
T.[Name],
D.[Hours],
D.[ActivityDate]
FROM DailyTaskHours D
INNER JOIN Task T
ON D.TaskId = T.PK_Task
INNER JOIN Story S
ON T.StoryId = S.PK_Story
INNER JOIN Sprint P
ON S.SprintId = P.PK_Sprint
INNER JOIN Product R
ON P.ProductId = R.PK_Product
这是视觉上的结果:
最后两列称为 Hours 和 ActivityDate。从表中可以看出,对于 Number - OPA-76,有两个条目:
我希望它是一行而不是两行。我希望有 7 列而不是最后两列标记为星期日到星期六,并且小时的两个条目根据它们的 ActivityDate 在一周中的正确日期。
每天只能输入1次。
我怎样才能做到这一点?
最佳答案
尝试这样的事情:
SELECT R.[Name], P.[Name], S.[Number], T.[Name],
sum(CASE WHEN DatePart(dw, D.ActivityDate) = 1 THEN D.[Hours] ELSE 0 END) AS Monday,
sum(CASE WHEN DatePart(dw, D.ActivityDate) = 2 THEN D.[Hours] ELSE 0 END) AS Tuesday,
sum(CASE WHEN DatePart(dw, D.ActivityDate) = 3 THEN D.[Hours] ELSE 0 END) AS Wednesday,
sum(CASE WHEN DatePart(dw, D.ActivityDate) = 4 THEN D.[Hours] ELSE 0 END) AS Thursday,
sum(CASE WHEN DatePart(dw, D.ActivityDate) = 5 THEN D.[Hours] ELSE 0 END) AS Friday,
sum(CASE WHEN DatePart(dw, D.ActivityDate) = 6 THEN D.[Hours] ELSE 0 END) AS Saturday,
sum(CASE WHEN DatePart(dw, D.ActivityDate) = 7 THEN D.[Hours] ELSE 0 END) AS Sunday
FROM DailyTaskHours D
INNER JOIN Task T ON D.TaskId = T.PK_Task
INNER JOIN Story S ON T.StoryId = S.PK_Story
INNER JOIN Sprint P ON S.SprintId = P.PK_Sprint
INNER JOIN Product R ON P.ProductId = R.PK_Product
GROUP BY R.[Name], P.[Name], S.[Number], T.[Name]
在这里阅读关于工作日的注释:
http://technet.microsoft.com/en-us/library/aa258265(v=SQL.80).aspx
关于sql - 合并具有相同日期的数据行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18836524/