Tsql 左外接递增和。如何预防？

以下是查询的简化版本，但其基本要点是：

WITH ClientSpend AS
    (
        SELECT
            c.ClientName
            , CONVERT(INT, (ROUND(SUM(CASE WHEN e.Type = 1 THEN e.Dollars ELSE 0 END), 0))) AS 1_Dollars
            , CONVERT(INT, (ROUND(SUM(CASE WHEN e.Type = 2 THEN e.Dollars ELSE 0 END), 0))) AS 2_Dollars
            -- There's a bunch more of these for different 'Types'
        FROM Expense e WITH(NOLOCK)
            INNER JOIN Client c WITH(NOLOCK)
                ON c.ClientID = e.ClientID
        GROUP BY c.ClientName
    )
SELECT
    ClientName
    , 1_Dollars
    , 2_Dollars
FROM ClientSpend
GROUP BY ClientName

类型2有其自己的费用表，该表细分为我在CTE选择中需要的最后一个案例/总额行的更精细的细节

我尝试在尽可能多的索引上使用[ExpenseType2]表的左连接测试上述查询，我注意到在执行此操作时，2_美元的总和更高。我假设它正在生成多条记录，即使我没有从[ExpenseType2]表中选择任何内容

我如何防止这种情况

---

谢谢，

为什么不使用子查询？还是简单的select语句？或者，您可能需要使用示例数据断言更多信息

SELECT first_name, 1_Dollars, 2_Dollars FROM  
(
    SELECT
        c.ClientName
        , CONVERT(INT, (ROUND(SUM(CASE WHEN e.Type = 1 THEN e.Dollars ELSE 0 END), 0))) AS 1_Dollars
        , CONVERT(INT, (ROUND(SUM(CASE WHEN e.Type = 2 THEN e.Dollars ELSE 0 END), 0))) AS 2_Dollars
        -- There's a bunch more of these for different 'Types'
    FROM Expense e WITH(NOLOCK)
        INNER JOIN Client c WITH(NOLOCK)
            ON c.ClientID = e.ClientID
    GROUP BY c.ClientName
) a 

请阅读一些关于改进您的问题的提示。