mysql - 尝试获取慈善组织的捐款和费用月度报告

Question

我有两个表，分别称为费用和捐赠

表1

费用

s.no   expensedate    expense
1       13/01/16         30
2       15/01/16         60

表2

s.no   donationdate    donation
15       14/01/16         30
18       19/01/16         10

需要输出

Month       Expense    Donation
Jan            90            40

我可以像这样单独获取输出

Month  expense
jan       90

或

Month  donation
jan       40

但无法将它们连接在一起，这样就可以提供所需的输出。

谢谢

Answer 1

我会使用union all和group by来做到这一点:

select date_format(dte, '%Y-%m') as yyyymm,
       coalesce(sum(expense), 0) as expenses,
       coalesce(sum(donation), 0) as donations
from ((select expensedate as dte, expense, null as donation
       from expenses
      ) union all
      (select donationdate as dte, null, donation
       from donations
      )
     ) ed
group by date_format(dte, '%Y-%m')
order by yyyymm;