Mysql 如何使用Union组合这两个查询？

我尝试使用union语句将两个查询合并为一个查询

这就是我到目前为止所做的：

    (Select Distinct concat(d.FirstName, ' ', d.LastName) as 'Donor',
        sum(a.amount) as 'Total Paid', 0 as Pocket 
        From Donor d, Pledge p, Payment a
        Where d.DonorId=p.DonorId
        and p.pledgeId = a.pledgeId
        group by d.donorid)

        union all

    (Select Distinct concat(d.FirstName, ' ', d.LastName) as 'Donor',
        0 as 'Total Paid',sum(a.amount) as 'Pocket'
        From Donor d, Pledge p, Payment a
        Where (a.CompanyId is null) 
        and d.DonorId=p.DonorId
        and p.pledgeId = a.pledgeId
        group by d.donorid);

这就产生了：

+--------------+------------+---------+
| Donor        | Total Paid | Pocket  |
+--------------+------------+---------+
| John Smith   |    3500.00 |    0.00 |
| Linda Smith  |     250.00 |    0.00 |
| Jack Clinton |     200.00 |    0.00 |
| Jane Doe     |    2100.00 |    0.00 |
| John Smith   |       0.00 | 1750.00 |
| Linda Smith  |       0.00 |  100.00 |
| Jack Clinton |       0.00 |  200.00 |
| Jane Doe     |       0.00 | 2100.00 |
+--------------+------------+---------+

我不知道如何摆脱重复的部分。我希望前四个名字与后四个名字结合起来，创建4个名字，其中“total paid”和“pocket”都有值，而不是零

为了清楚起见，我希望输出如下所示：

+--------------+------------+---------+
| Donor        | Total Paid | Pocket  |
+--------------+------------+---------+
| John Smith   |    3500.00 | 1750.00 |
| Linda Smith  |     250.00 |  100.00 |
| Jack Clinton |     200.00 |  200.00 |
| Jane Doe     |    2100.00 | 2100.00 |
+--------------+------------+---------+ 

---

我知道我遗漏了一些关于工会声明的东西，我只是不知道它是什么。非常感谢您的帮助。

似乎您不必这样做，您只需计算条件

和（使用
大小写
）：

这将在第5行返回语法错误。我不太熟悉case语句或您使用join的方式，所以我很难弄清楚sytax的错误是什么。我应该抓住它的。谢谢。这正是我想要的。
select concat(d.FirstName, ' ', d.LastName) as 'Donor'
     , sum(a.amount) as 'Total Paid'
     , sum(case when a.CompanyId is null then a.amount else 0 end) as 'Pocket' 
from Donor d
join Pledge p on d.DonorId = p.DonorId
join Payment a on p.pledgeId = a.pledgeId
group by d.donorid