从MS Access中的2个表中总结

Question

我需要编写一个SQL查询，根据每个表中的公共字段的分组将总共来自两个不同表（保险和投资）的字段（BranchRevenue）组成一个数字的SQL查询（BrokerName ）。数据库是MS Access（我在下面的超链接中提供了一个示例结构）。

我从看的如此相似职位的理解是，我需要定义从各个表的款项（这是我可以做的），然后使用DISTINCT或DISTINCTROW（我做不到聚集在一起）。

以下是每个表单独的查询，它们通过BrokerName正确合计BranchRevenue。

SELECT Investments.BrokerName AS [BrokerName],Sum(Investments.BranchRevenue) as [BranchRevenue] 
FROM Investments WHERE (((Investments.Ledger = 'Actual') AND (Investments.Year1 = 2017) AND (Investments.Period = 6) AND (Investments.Branch = 'Toronto'))) 
GROUP BY Investments.BrokerName 

SELECT Insurance.BrokerName AS [BrokerName],Sum(Insurance.BranchRevenue) as [BranchRevenue] 
FROM Insurance WHERE (((Insurance.Ledger = 'Actual') AND (Insurance.Year1 = 2017) 
    AND (Insurance.Period = 6) AND (Insurance.Branch = 'Toronto'))) 
GROUP BY Insurance.BrokerName 

如何使用单个SQL语句来完成此操作？

理想的解决方案将正确地将两个表的BranchRevenue合并为每个BrokerName的一个数字，而不从两个表中复制数据。

Answer 1

你可以做一个简单的UNION ALL查询，然后组

select BrokerName, sum(BranchRevenue) from (
select * from Insurer 
    where... 
union all 
select * from Investments 
    where ...) 
group by BrokerName 

Answer 2

你可以使用union all总结前两个表中的结果相结合：

SELECT [BrokerName], SUM([BranchRevenue]) 
FROM  (SELECT Investments.BrokerName AS [BrokerName], 
       Investments.BranchRevenue AS [BranchRevenue] 
      FROM Investments 
      WHERE Investments.Ledger = 'Actual' AND 
       Investments.Year1 = 2017 AND 
       Investments.Period = 6 AND 
       Investments.Branch = 'Toronto' 
      UNION ALL 
      SELECT Insurance.BrokerName AS [BrokerName], 
       Insurance.BranchRevenue AS [BranchRevenue] 
      FROM Insurance 
      WHERE Insurance.Ledger = 'Actual' AND 
       Insurance.Year1 = 2017 AND 
       Insurance.Period = 6 AND 
       Insurance.Branch = 'Toronto' 
     ) t 
GROUP BY [BrokerName]