Question

我有两个表“ tbl_In_Details”和“ tbl_Out_Details” tbl_In_Details的样本数据

ID  Item_Name   Rate    Quantity    Source_company  
1   wire         10        4        2020-04-21 22:47:29.083 
2   Tea          4         20       2020-04-21 22:47:52.823 

Sample data for tbl_Out_Details

ID  Item_Name   Quantity    Created_Date
1     wire        1       2020-04-21 22:48:48.233   
2     wire        2       2020-04-21 22:50:16.367   
3     Tea         2       2020-04-21 23:48:39.943

现在我想从外面的桌子上计算价格和价格的总和（RATE * QUANTITY）我尝试过这种方式，但没有得到结果

select o.Item_Name, SUM(o.quantity) as Total_quantity ,SUM(o.quantity * i.Rate) as Expenses
from tbl_In_Details i inner join tbl_Out_Details o
ON i.Item_Name = o.Item_Name group  by o.Item_Name,o.quantity, i.Rate

我的输出应为

Item_Name   Total_quantity  Expenses
Tea           2               8
wire          3               30

Answer 1

您的查询完全正确。要获得期望的结果，唯一需要做的就是删除按“数量”和“比率”分组。

select o.Item_Name, SUM(o.quantity) as Total_quantity ,SUM(o.quantity * i.Rate) as Expenses
from tbl_In_Details i inner join tbl_Out_Details o
ON i.Item_Name = o.Item_Name group  by o.Item_Name;

Answer 2

一种方法使用union all和group by：加入之前汇总：

select i.item_name, o.quantity, i.expenses
from (select id, item_name, sum(rate*quantity) as expenses
      from tbl_In_Details
      group by id, item_name
     ) i join
     (select id, item_name, sum(quantity) as quantity
      from tbl_Out_Details
      group by id, item_name
     ) o
     on i.id = o.id

如何为两个不同的表具有不同的包含表字段计算总和

2 个答案: