來自結果表mysql的兩行總和

Question

我想從結果查詢中獲得兩行的總和。 我已經嘗試過此代碼，但似乎無法正常工作。 但是，如果我刪除小孩，它是可行的，但不會給出總數。

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

一個問題（至少）是您不能在定義別名的同一SELECT中重用別名。 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);

我也建議您包括所有要插入的列。 這是一個養成的好習慣。 所以：

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