来自结果表mysql的两行总和

Question

我想从结果查询中获得两行的总和。 我已经尝试过此代码，但似乎无法正常工作。 但是，如果我删除小孩，它是可行的，但不会给出总数。

INSERT INTO totaltransportcost
    select year(date) as y, month(date) as m, sum(FuelCost) as fc, SUM(OtherExpenses) as oe, SUM(fc+as) as tot
    from turn
    group by year(date), month(date)

Answer 1

一个问题（至少）是您不能在定义别名的同一SELECT中重用别名。 所以：

INSERT INTO totaltransportcost
    select year(date) as y, month(date) as m, sum(FuelCost) as fc, 
           SUM(OtherExpenses) as oe,
           SUM(FuelCost + OtherExpenses) as tot
    from turn
    group by year(date), month(date);

我也建议您包括所有要插入的列。 这是一个养成的好习惯。 所以：

insert into totaltransportcost(y, m, fc, oe, tot)  -- or whatever the column names are
     . . .