Question

我希望有人可以帮助我快速解决这个问题。出于某种原因，我只是不知道如何将我的表格与某些费率相乘。这就是我所面对的：

表1 - LocTbl

ID Location Inspections ServiceCalls RegularHrs OTHrs
1 LA         1             3            7         2
2 LA         2             4            6         3
3 LA         5             1            8         1

表2 - 费率

Location RateType      Rate
LA       Inspections    100
LA       ServiceCalls   42
LA       RegularHrs     20
LA       OTHRs          30
SF       Inspections    110
SF       ServiceCalls   45

期望的结果：

Location InspectionCost ServiceCallCost RegularHrsCost OTHrsCost TotalCost
LA       800            336             630            120       1886

我需要的是位置表中的每一列总数乘以相应的费率和这些列的总和。像这样：

SELECT 
Sum(Location.Inspections)*Rates.Rate as InspectionCost, 
Sum(Location.ServiceCalls)*Rates.Rate as ServiceCallCost, 
Sum(Location.RegularHrs)*Rates.Rate as RegularHrsCost, 
Sum(Location.OTHRs)*Rates.Rate as OTHrsCost
[-- >Sum(InspectionCost)+Sum(ServiceCallCost)+Sum(RegularHRsCost)+Sum(OTHrsCost) as TotalCost  <--] 
^ how can I calculate the totals for the columns already multiplied?
FROM Location, Rates
WHERE Rates.Rate = ? {how do I reference all of the corresponding rates?}

有人可以帮我提一些直接的建议，告诉我如何才能达到我想要的结果。欢迎任何解决方法。

Answer 1

你可以试试这个。我把它写成了白色测试（我现在必须回家）。对于任何错误我明天都可以帮到你。

SELECT A.LOCATION
        , A.T_Inspections*B1.Rate as InspectionCost
        , A.T_ServiceCall*B2.Rate as ServiceCallCost
        , A.T_RegularHrs*B3.Rate as RegularHrsCost
        , A.T_OTHrs*B4.Rate as OTHrsCost
        , A.T_Inspections*B1.Rate + A.T_ServiceCall*B2.Rate+A.T_RegularHrs*B3.Rate+A.T_OTHrs*B4.Rate AS TOTAL_COST
FROM (SELECT  LOCATION, 
        Sum(Inspections) AS T_Inspections, 
        Sum(ServiceCalls)AS T_ServiceCall, 
        Sum(RegularHrs)AS T_RegularHrs, 
        Sum(OTHRs) AS T_OTHrs   
        FROM Location 
        GROUP BY LOCATION) A
INNER JOIN RATES B1 ON A.LOCATION = B1.LOCATION AND B1.RATETYPE='Inspections' 
INNER JOIN RATES B2 ON A.LOCATION = B2.LOCATION AND B2.RATETYPE='ServiceCalls' 
INNER JOIN RATES B3 ON A.LOCATION = B3.LOCATION AND B3.RATETYPE='RegularHrs' 
INNER JOIN RATES B4 ON A.LOCATION = B4.LOCATION AND B4.RATETYPE='OTHRs'

通过多个速率将两个不同表中的多个列相乘（mysql）

1 个答案: