mysql - 加入不总结 CASE WHEN

Question

我想要做的是显示我本月的当前表现，与预期的预定胜利进行比较，然后按产品类型显示预期的总金额。

为清楚起见，我将两个子产品归为同一个名称。

我的问题是，对于我的“收费”金额，它将两个子产品分开，而“预定”金额工作正常。

表格应该是这样的:

Type | Charged | Scheduled | Expected
A      3         2           5
B      1         1           2

实际显示的是:

Type | Charged | Scheduled | Expected
A      2         1           3
A      1         1           2
B      1         1           2

代码如下:

select
t2.product,
t1.Charged,
t2.Scheduled,
t1.charged + t2.scheduled as 'expected'
from(
select
    case
        when user_type = 'a1' then 'a'
        when user_type = 'a2' then 'a'
        else 'b'
    end as 'Type',
    SUM(charged) as 'Scheduled'
from
  table
where
  month(date) = month(now())
and
  year(date) = year(now())
  and status like 'scheduled'
group by 1
order by 2 desc) t2 join 
(select
    case
        when user_type = 'a1' then 'a'
        when user_type = 'a2' then 'a'
        else 'b'
    end as 'Type', 
    sum(charged) as 'Charged'
    FROM table
    WHERE (status = 'Complete'
       AND str_to_date(concat(date_format(date, '%Y-%m'), '-01'), '%Y-%m-%d') = str_to_date(concat(date_format(now(), '%Y-%m'), '-01'), '%Y-%m-%d'))
    GROUP BY user_type
    ORDER BY user_type ASC) as t1 on t1.type = t2.type

我很感激我可能没有很好地解释这一点(而且我的代码可能很笨拙 - 我还是个新手!)所以任何帮助/指导都将不胜感激。

谢谢!

Answer 1

一些建议

您在主选择中有一个产品列，但您在子查询中输入的是产品而不是产品

你不应该在列名周围使用单引号

您有按用户类型分组的广告，但您需要按类型分组才能收费

select
t2.type,
t1.Charged,
t2.Scheduled,
t1.charged + t2.scheduled as 'expected'
from(
select
    case
        when user_type = 'a1' then 'a'
        when user_type = 'a2' then 'a'
        else 'b'
    end as Type,
    SUM(charged) as Scheduled
from
  table
where
  month(date) = month(now())
and
  year(date) = year(now())
  and status like 'scheduled'
group by 1
order by 2 desc) t2 join 
(select
    case
        when user_type = 'a1' then 'a'
        when user_type = 'a2' then 'a'
        else 'b'
    end as Type, 
    sum(charged) as Charged
    FROM table
    WHERE (status = 'Complete'
       AND str_to_date(concat(date_format(date, '%Y-%m'), '-01'), '%Y-%m-%d') = str_to_date(concat(date_format(now(), '%Y-%m'), '-01'), '%Y-%m-%d'))
    GROUP BY Type
    ORDER BY Type ASC) as t1 on t1.type = t2.type