Mysql 如何将这两个查询合并为一个查询？

我知道关于这类话题有很多问题，但我找不到任何对我的问题有帮助的

我有两个工作问题。我想将它们合并到一个查询中。当我尝试合并它们时，显示的数据不正确。但是，当它们分开时，数据是正确的

问题1：

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

输出：

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

+--------------+----------+
| Donor        | Pocket   |
+--------------+----------+
| John Smith   | $1750.00 |
| Linda Smith  | $100.00  |
| Jack Clinton | $200.00  |
| Jane Doe     | $2100.00 |
+--------------+----------+

+--------------+------------+-----------+
| Donor        | Total Paid | Pocket    |
+--------------+------------+-----------+
| John Smith   | $24500.00  | $20750.00 |
| Linda Smith  | $1750.00   | $12450.00 |
| Jack Clinton | $1400.00   | $8300.00  |
| Jane Doe     | $14700.00  | $8300.00  |
+--------------+------------+-----------+

问题2：

Select Distinct concat(d.FirstName, ' ', d.LastName) as 'Donor',
concat('$', 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;

输出：

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

+--------------+----------+
| Donor        | Pocket   |
+--------------+----------+
| John Smith   | $1750.00 |
| Linda Smith  | $100.00  |
| Jack Clinton | $200.00  |
| Jane Doe     | $2100.00 |
+--------------+----------+

+--------------+------------+-----------+
| Donor        | Total Paid | Pocket    |
+--------------+------------+-----------+
| John Smith   | $24500.00  | $20750.00 |
| Linda Smith  | $1750.00   | $12450.00 |
| Jack Clinton | $1400.00   | $8300.00  |
| Jane Doe     | $14700.00  | $8300.00  |
+--------------+------------+-----------+

合并时：

Select Distinct concat(d.FirstName, ' ', d.LastName) as 'Donor', 
concat('$', sum(a.amount)) as 'Total Paid',
concat('$', sum(a2.amount)) as 'Pocket'
From Donor d, Donor d2, Pledge p, Pledge p2, Payment a, Payment a2
where d.donorId=p.donorId
and p.pledgeId = a.pledgeId
and (a2.CompanyId is null)
and d2.DonorId = p2.DonorId
and p2.pledgeId = a2.PledgeId
group by d.DonorId;

输出：

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

+--------------+----------+
| Donor        | Pocket   |
+--------------+----------+
| John Smith   | $1750.00 |
| Linda Smith  | $100.00  |
| Jack Clinton | $200.00  |
| Jane Doe     | $2100.00 |
+--------------+----------+

+--------------+------------+-----------+
| Donor        | Total Paid | Pocket    |
+--------------+------------+-----------+
| John Smith   | $24500.00  | $20750.00 |
| Linda Smith  | $1750.00   | $12450.00 |
| Jack Clinton | $1400.00   | $8300.00  |
| Jane Doe     | $14700.00  | $8300.00  |
+--------------+------------+-----------+

每一个查询都有一列供捐赠者姓名，还有一列有一些货币值。在我的最后一个查询中，我需要一个包含捐赠者姓名的列，一个标记为“Total Paid”的列，以及一个标记为“Pocket”的列。当我结合这两个查询时，“total paid”列和“pocket”列都被搞乱了

我知道如果没有表模式，这可能很难帮助解决，但我想我应该试一试。提前感谢。

试试这个：

select
    'Donor',concat('$',sum('Total Paid')) as 'Total Paid',concat('$',sum('Pocket')) as 'Pocket'
from(
        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
    ) group by Donor;

---

注意：如果您使用的是MySQL数据库，您应该使用

反勾号（“`”）而不是单引号作为列名。
谢谢您的建议。这几乎奏效了。当我单独尝试第一个子查询和第二个子查询时，我得到了正确的输出。但是，当我尝试整个过程时，所有结果都显示为0。列标题正确，但所有值均为0。我不知道它为什么会这样做。对这个问题有什么建议吗？