Sql 从MS Access中的两个表求和

我需要编写一个SQL查询，根据每个表（BrokerName）中公共字段的分组，将两个不同表（保险和投资）中的字段（BranchRevenue）相加为一个数字。数据库是MS Access（我在下面的超链接中提供了一个示例结构）

通过查看SO上的类似帖子，我的理解是，我需要从各个表中定义总和（我可以这么做），然后使用DISTINCT或DISTINCTROW（我不能这么做）将它们聚合在一起

下面是针对每个表的单独查询，这些查询通过BrokerName正确地求和BranchResidence

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

如何使用一条SQL语句来实现这一点

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理想的解决方案是将两个表中的BranchResidence正确相加为每个BrokerName的一个数字，同时不复制两个表中的数据。

您可以执行简单的union all查询，然后进行分组

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

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在求和之前，您可以使用

union all

组合两个表的结果：

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]

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这个解决方案非常有效。非常感谢您的快速帮助。=）