如何将这两个查询合并为一个查询？

Question

我知道有关此类主题的问题很多，但找不到任何可以解决我的问题的问题。

我有两个工作查询。 我想将它们合并为一个查询。 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。

查询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   |
+--------------+------------+

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

结合时：

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 | 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  |
+--------------+------------+-----------+

每个查询都有一个供体名称栏和一个具有货币值的栏。 在我的最后一个查询中，我想要一列带有捐赠者名称的列，一个标记为“已支付总额”的列和一个标记为“口袋”的列。 当我结合这两个查询时，“已付款总额”列和“口袋”列都被弄乱了。

我知道如果没有表模式，这可能很难解决，但是我想我会尝试一下。 提前致谢。

Answer 1

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：如果使用的是MySQL数据库，则应使用backticks （“`”）代替列名的单引号。