如何编写查询结果，总和到不同tabele中的列

Question

我可以将 idprice 的 tabel A 组合两列，

Answer 1

试试这个：

select
    a.idprice,
    sum(a.tax) + b.price as sum_price
from 
    tableA a
    inner join 
        tableB b on b.idprice = a.idprice
group by
    a.idprice,
    b.price

SQLFiddle

Answer 2

<强>查询

select t1.tax + t2.price as new_col_name
from
(
    select idprice, sum(tax) as tax
    from table1
    group by idprice
) t1
join table2 t2
on t1.idprice = t2.idprice;

Answer 3

试试这个

Select (Sum(A.tax) + Sum(B.Price)) As Result 
From TableA A Inner Join TableB B on A.idprice = B.idprice  
Group By A.idprice