Question

我有一份报告显示用户摘要，从2个数据库中获取数据。我编写了单独的数据集来获取每列，但由于价值可能会重复，我不知道如何获得每个用户的所有记录

我在查询中使用UNION ALL来从2个数据库中获取数据

MainDataset

Select Count(*) as total, Username from database1
where my condition...
group by Username   
UNION ALL
Select Count(*) as total, Username from database2
where my condition...
group by Username 

Username    Total
User1       2  
User2       1  
User3       3
User4       4
User5       10
User6       5

数据集2

Select Count(*) as totalCol2, Username from database1
where condition for this column...
group by Username   
UNION ALL
Select Count(*) as totalCol2, Username from database2
where condition for this column...
group by Username 

Username    totalCol2
User1       2  
User2       1  
User2       1  
User3       3  
User3       2  
User4       1  
User5       2  
User5       3  
User6       4

我正在使用MainDataset来显示报告中的行，而每列我需要显示Dataset2的摘要：

Username    Total   totalCol2
User1       2   2  
User2       1   2  
User3       3   5
User4       4   1
User5       10  5
User6       5   4

我尝试使用查找，但只获得了来自dataset2的第一个匹配，sum函数与条件但不起作用。有人可以告诉我是否能在SSRS中做些什么。

该报告有10多个列，每个列来自不同的数据集。

Answer 1

最简单的答案是更改数据集的查询，以便它们不返回多行：合并查询中的行。

真正简单的版本就是将现有的Dataset2查询包装在外部Select ... Group By：

略微修订的数据集2：

SELECT
   Username,
   SUM(totalCol2) as totalCol2
FROM
(
   SELECT Count(*) AS totalCol2, Username FROM database1
   WHERE condition for this column...
   GROUP BY Username   
   UNION ALL
   SELECT Count(*) AS totalCol2, Username FROM database2
   WHERE condition for this column...
   GROUP BY Username
) AS tableA
GROUP BY Username

更大的重写会给你：

SELECT
   Username,
   COUNT(*) AS totalCol2
FROM
   (SELECT UserName FROM database1
    WHERE Condition
    UNION ALL
    SELECT UserName FROM database2
    WHERE Condition
    ) AS tableA
 GROUP BY Username

上述任何一个查询都可以很好地与查找函数配合使用。

但是如果你的database1和database2 对于所有十个查询都是相同的，然后我会尝试将它们组合起来。也许是这样的：

SELECT
   Username,
   SUM(Col1) AS totalCol1,
   SUM(Col2) AS totalCol2,
   ...
FROM
   (SELECT
      UserName,
      CASE WHEN [columns meet condition for Col1]
       THEN 1 ELSE 0 END AS Col1,
      CASE WHEN [test for condition of Column2]
       THEN 1 ELSE 0 END AS Col2,
      ... 
    FROM database1

    UNION ALL
    SELECT
      UserName,
      CASE WHEN [columns meet condition for Col1]
       THEN 1 ELSE 0 END AS Col1,
      CASE WHEN [test for condition of Column2]
       THEN 1 ELSE 0 END AS Col2,
      ... 
    FROM database2
    ) AS tableA
 GROUP BY Username

在摘要SSRS报告中使用来自不同数据库的数据集进行问题

1 个答案: