来自结果表mysql的两行总和

Question

I want to get sum of two rows from the result query. I have tried this code but it doesn't seem to work. But if i remove tot it worked but doesn't give total.

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

One problem (at least) is that you cannot re-use aliases in the same SELECT where they are defined. So:

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);

I would also to advise you to include all the columns being inserted. This is a good habit to get into. So:

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