mysql总和付款和按日期分组

Question

嗨，请帮助我 我需要查询以下示例 在两个表日期字段相同日期来更多次或一次我需要输出查询只有每天一行不想重复的日子我们想要计算在同一两个表中的其他付款和税

离 table1

payment tax date

100 1.02 15-1-2010

23 0.09 15-1-2010

45 2.3 2-3-2011

table2

pay pdate

400 15-1-2010

253 18-1-2010

465 2-2-2011

我需要这样的输出

pay tax pdate

523 1.02 15-1-2010

465 0 2-2-2011

45 2.3 2-3-2011

Answer 1

select sum(payment) pay, min(tax) tax, pdate
from
(
    select payment, tax, date
    from table1
    union all
    select pay, 0, pdate
    from table2
) x
group by date

Answer 2

select sum(payment) pay, sum(tax) tax, date pdate
  from (select payment, tax, date
          from table1
         union all
        select pay,0.0, pdate
          from table2) t
 group by pdate;