Question

更新了问题。我有以下表格：项目表 projectid，项目

存储表 STOREID，STORENAME，专案编号

projectupdates表 trackerid，projectid，storeid，activityid，date

活动表活动，活动

项目可能有也可能没有商店商店可能有也可能没有活动对于商店，可以重复活动

有了这个，我想要所有的项目，所有的商店的商店和更新。

活动（如果有）应仅显示活动的最新日期。

我还想要一个对每个进行计数的摘要行活动有日期的活动。（如果为null 不要算。）

我尝试了以下代码：

SELECT     P.ProjectID, S.StoreID, MAX(CASE WHEN Activity = 'Meas Perm Received' THEN Date ELSE NULL END) AS MeasPermRcvd, MAX(CASE WHEN Activity = 'Not Visited' THEN Date ELSE NULL END) AS NotVisited, MAX(CASE WHEN Activity = 'Not Visited' THEN ReasonID ELSE '' END) AS NotVisitedReason, MAX(CASE WHEN Activity = 'Visited & Measured' THEN Date ELSE NULL END) AS Measured

FROM dbo.ProjectUpdates AS T INNER JOIN dbo.Project AS P ON T.ProjectID = P.ProjectID INNER JOIN dbo.ProjectStores AS S ON T.StoreID = S.StoreID INNER JOIN dbo.Activity AS A ON T.ActivityID = A.ActivityID GROUP BY P.ProjectID，S.StoreID

然后我尝试使用这个额外的查询来获取所有项目和商店：

SELECT dbo.Project.ProjectID, dbo.ProjectStores.StoreID,dbo.StoreTrackerBase.MeasPermRcvd, dbo.StoreTrackerBase.NotVisited, dbo.StoreTrackerBase.NotVisitedReason, dbo.StoreTrackerBase.Measured

FROM dbo.Project FULL OUTER JOIN dbo.ProjectStores ON dbo.Project.ProjectID = dbo.ProjectStores.ProjectID FULL OUTER JOIN dbo.StorTrackerBase ON dbo.ProjectStores.StoreID = dbo.StoreTrackerBase.StoreID AND dbo.ProjectStores.ProjectID = dbo.StoreTrackerBase.ProjectID

这将返回所有项目和所有具有最新活动日期的商店。请告知这是否是良好的编码方式以及性能是否良好。

请注意我在此查询中没有摘要行（不知道该怎么做！）谢谢。克里希纳

Answer 1

您可以将MAX(CASE WHEN Activity = 'ActivityType' THEN Date END)与Group by ProjectName,Store

一起使用

SELECT
    ProjectName,Store,
    MAX(CASE WHEN Activity = 'Visited' THEN Date ELSE NULL END) AS Visited,
    MAX(CASE WHEN Activity = 'NotVisited' THEN Date ELSE NULL END) AS NotVisited,
    MAX(CASE WHEN Activity = 'Finished' THEN Date ELSE NULL END) AS Finished
FROM Table1 T
INNER JOIN Project P
ON T.ProjectID = P.ProjectID
INNER JOIN Store S
ON T.StoreID = S.StoreID
INNER JOIN Activity A
ON T.ActivityID = A.ActivityID
GROUP BY ProjectName,Store

基于id填充sqlserver中不同列的日期

1 个答案: