mysql - 在 MYSQL 中合并两个不同表的结果

Question

我必须通过“销售人员”列将两个具有不同列集的表组合起来。 到目前为止，我得到的查询的问题是一些销售人员的姓名重复，而右表中的一些姓名丢失。

交易表

salesperson,     Profit,     Units
John             100          1
John             50           1
Carl             200          2
Matt             300          3

连接表

salesperson,       Amount       
Carl               100
Lynda              200
Lucy               300

组合表

salesperson,       (Amount+Profit),    Units(sum)
Carl               300                 2
John               150                 2
Matt               300                 3
Lynda              200                 0
Lucy               300                 0

这就是我目前所得到的

SELECT t.salesperson, SUM(t.profit) + SUM(c.amount), SUM(t.units)
FROM transactions AS t
FULL OUTER JOIN connections as c ON t.salesperson = c.salesperson
GROUP BY t.salesperson
ORDER BY t.salesperson ASC

如有任何帮助，我们将不胜感激。

Answer 1

SELECT salesperson, SUM(total), SUM(Units)
FROM 
     (
        SELECT salesperson, Amount as total, Units
        FROM Transactions
        UNION ALL
        SELECT salesperson, Profit as total, 0 as Units
        FROM Connections
    ) T
GROUP BY salesperson