按日期月份多个表分组

如何解决按日期月份多个表分组

您可以使用合并表中的数据union all，然后进行汇总。

我怀疑您想要这样的东西：

select year(dte), month(dte),
       sum(spending) as spending, sum(directtv) as directtv,
       sum(price*quantity) as turnover
from ((select datesp as dte, amount as spending, 0 as directtv, 0 as price, 0 as quantity
       from spending
      ) union all
      (select datetv as dte, 0 as spending, amount as directtv, 0 as price, 0 as quantity
       from directtv
      ) union all
      (select datesales as dte, 0 as spending, 0 as directtv, price, quantity
       from sales
      )
     ) x
group by year(dte), month(dte) ;

这与查询中的内容不完全相同，但是鉴于您提供的数据，这才有意义。

解决方法

因此，我有3个表：
支出 -记录费用
Directv- 记录电视频道的订阅付款
销售 -记录销售
，我必须计算每月的营业额，销售总额，总费用和Directv

    Spending
    id|Amount|dateSpd
    1 |2000  |2018-10-05
    3 |3000  |2018-11-06

    Directv
    id|Amount|dateTv
    1 |50    |2018-10-05

    Sales
    id|customer|quantity|price|dateSales
    1 |Marc    |2       |500  |2018-10-05
    2 |Kevin   |3       |1500 |2018-10-05
    5 |Angel   |2       |500  |2018-11-07

我想举个例子

turnover | Spending | sales | DirecTv | month | year
  5500   | 3000     | 2000  | 50      | 10     |2018
   1000  | 2000     | 500   | 0       | 11     |2018

我有一些问题要解决，我的查询是：

--to get total amount of sales
select sum(sl.price),month(sl.date),year(sl.date) from sales sl GROUP by year(sl.date),month(sl.date)

--for directtv
select sum(dv.amount),month(dv.date),year(dv.date) from directtv dv GROUP by year(dv.date),month(dv.date)

--for turnover
SELECT sum(sl.quantity*sl.price),month(sl.date) FROM sales sl GROUP by year(sl.date),month(sl.date)

但是如何按日期将所有SQL查询与分组进行分组
可以帮助我或给我任何提示呢？先感谢您