別名とグループを使用してSUMを選択した列

Question

別名とグループ化を使用して選択列に対して計算を実行しようとしています。クエリは、（前からライン上の問題）以下である：

select r.res_id, 
    r.arrive_date, 
    r.depart_date, 
    r.res_type, 
    if(DATEDIFF(r.depart_date, r.arrive_date) >29, 'LT', 'ST') as 'StayType', 
    SUM(r.rent + r.fee_arr_early + r.fee_dep_late + r.fee_peace_waiver + r.fee_pool + r.city_tax + r.fee_cleaning + r.fee_pet + r.fee_tshirt + r.fee_misc + r.fee_non_tax + r.fee_processing + r.fee_travel_ins + r.fee_event + r.fee_cancel) as 'folioTotal', 
    coalesce((select SUM(g.amount) from guest_payments as g where g.resId = r.res_id and charge_type = 'charge' and approved = 'Y'),0) as 'payments', 
    coalesce((select SUM(g.amount) from guest_payments as g where g.resId = r.res_id and charge_type = 'credit' and approved = 'Y'),0) as 'credits', 
    (SUM('folioTotal') - SUM('payments') + SUM('credits')) as 'folioBalance' 
from reservations as r 
    join guest_payments as g 
     on r.res_id = g.resId 
     group by r.res_id 

私は同じ結果と別の合計の内側にこれを入れて試してみました。

Answer 1

私はばかげていましたが、私はシングルティックのエイリアスを参照していました。なぜなら、それは計算していなかったからです。ソリューション：

select r.res_id, 
    r.arrive_date, 
    r.depart_date, 
    r.res_type, 
    g.entry_date, 
    if(DATEDIFF(r.depart_date, r.arrive_date) >29, 'LT', 'ST') as 'StayType', 
    (select SUM(r.rent + r.fee_arr_early + r.fee_dep_late + r.fee_peace_waiver + r.fee_pool + r.city_tax + r.fee_cleaning + r.fee_pet + r.fee_tshirt + r.fee_misc + r.fee_non_tax + r.fee_processing + r.fee_travel_ins + r.fee_event + r.fee_cancel) from reservations as r where r.res_id = g.resId) as 'folioTotal', 
    coalesce((select SUM(g.amount) from guest_payments as g where g.resId = r.res_id and charge_type = 'charge'),0) as 'payments', 
    coalesce((select SUM(g.amount)* -1 from guest_payments as g where g.resId = r.res_id and charge_type = 'credit' and approved = 'Y'),0) as 'credits', 
    (select folioTotal - payments + credits) 
from reservations as r 
    join guest_payments as g 
     on r.res_id = g.resId 
     group by r.res_id