Question

我在报表生成器中有一个奇怪的行为。在尝试使用报表生成器之前，我正在使用现有数据集并在SQL studio中测试我自己的代码。我迷路了，因为我不明白为什么以下不起作用：

    SELECT
        v_Collection_Alias.Name as CollectionName,  
        v_Package_Alias.Name as SoftwareName, 
        'Package' as ApplicationType,
        NumberSuccessTable='NumberSuccessTable', sum(case when stat.LastState in (-1,13) then 1 else 0 end) as NumberSuccess,
        NumberInProgressTable='NumberInProgress', sum(case when stat.LastState in (8,9) then 1 else 0 end) as NumberInProgress,
        NumberUnknownTable='NumberUnknown', sum(case when stat.LastState in (0) then 1 else 0 end) as Unknown,
        NumberErrorTable='NumberError', sum(case when stat.LastState in (11) then 1 else 0 end) as NumberError,
        NumberOtherTable='NumberOther', sum(case when stat.LastState in (10) then 1 else 0 end) as NumberOther,
        '' as LastModifiedby,
        '' as Version,
        v_Advertisement_Alias.CollectionID as CollectionID,
        v_Advertisement_Alias.AdvertisementID as DeploymentID,
        '' as CI_ID,
        '' as DeploymentTime,
        v_Advertisement_Alias.PresentTime as ModificationTime,
        '' as AssignmentID

FROM fn_rbac_Advertisement(@UserSIDs) v_Advertisement_Alias  
JOIN fn_rbac_ClientAdvertisementStatus(@UserSIDs)  stat on v_Advertisement_Alias.AdvertisementID = stat.AdvertisementID
INNER JOIN fn_rbac_Package2(@UserSIDs) v_Package_Alias ON v_Advertisement_Alias.PackageID = v_Package_Alias.PackageID 
INNER JOIN fn_rbac_Collection(@UserSIDs) v_Collection_Alias ON v_Advertisement_Alias.CollectionID = v_Collection_Alias.CollectionID

此报告生成器提示我输入错误，因为fn_rbac_Advertisement.Name需要group by子句。以下内容适用于原始报告：

    SELECT
    v_Collection_Alias.Name as CollectionName,  
    v_Package_Alias.Name as SoftwareName, 
    '' as ApplicationType,
    '' as NumberSuccess,
    '' as NumberInProgress,
    '' as NumberUnknown,
        '' as NumberErrors,
        '' as NumberOther,
    '' as LastModifiedby,
    '' as Version,
    v_Advertisement_Alias.CollectionID as CollectionID,
    v_Advertisement_Alias.AdvertisementID as DeploymentID,
    '' as CI_ID,
    '' as DeploymentTime,
    v_Advertisement_Alias.PresentTime as ModificationTime,
    '' as AssignmentID,
    '' as ApplicationType 


FROM fn_rbac_Advertisement(@UserSIDs) v_Advertisement_Alias  
INNER JOIN fn_rbac_Package2(@UserSIDs) v_Package_Alias ON v_Advertisement_Alias.PackageID = v_Package_Alias.PackageID 
INNER JOIN fn_rbac_Collection(@UserSIDs) v_Collection_Alias ON v_Advertisement_Alias.CollectionID = v_Collection_Alias.CollectionID

以下内容返回我在SQL Studio中想要的内容：

Select 
NumberSuccessTable='NumberSuccessTable', sum(case when stat.LastState in (-1,13) then 1 else 0 end),
NumberInProgressTable='NumberInProgress',  sum(case when stat.LastState in (8,9) then 1 else 0 end),
NumberUnknownTable='NumberUnknown',  sum(case when stat.LastState in (0) then 1 else 0 end) AS NumberU,
NumberErrorTable='NumberError',  sum(case when stat.LastState in (11) then 1 else 0 end) AS NumberError,
NumberOtherTable='NumberOther', sum(case when stat.LastState in (10) then 1 else 0 end) as NumberOther
From  v_ClientAdvertisementStatus stat

感谢您的帮助！ :)

Answer 1

使用聚合函数（例如SUM）时，必须将GROUP BY子句应用于所有未聚合的列，例如：

GROUP BY v_Collection_Alias.Name,  
    v_Package_Alias.Name, 
    v_Advertisement_Alias.CollectionID as CollectionID,
    v_Advertisement_Alias.AdvertisementID as DeploymentID,
    v_Advertisement_Alias.PresentTime as ModificationTime

或者，如果您不想维护冗长的GROUP BY子句，则可以从SELECT语句中删除SUM函数，并让报表处理聚合，并在报表生成器中进行适当的分组。

Answer 2

第一次查询：

当您使用像SUM这样的聚合函数时，您需要在没有聚合函数的所有列上执行GROUP BY。

第二次查询：

这是有效的，因为您在选择时没有聚合函数，因此您不必使用GROUP BY，而报表生成器可以为您处理总和和分组。

第三个查询：

此查询有效，因为您在所有列上都有聚合函数，因此您不需要GROUP BY。

始终记住LOGICAL查询处理顺序如下：

1，从 2.WHERE 3.GROUP BY 4.HAVING 5.SELECT 6.ORDER BY

所以你的GROUP BY发生在SELECT之前因为那个原因你分组时你不能在你的group by子句中包含''，因为那个列还不存在。所以它给你一个错误。

不理解查询行为

2 个答案: