Question

我有4个SQL Server 2005表：MainTable，Info，Repairs，Maintenance

MainTable表：

MainID, PlateNo
1, A123
2, D222

信息表：

InfoID, MainID, Location
1, 1, California
2, 2, Ohio

修理表：

RepairID, MainID, Cost, InvoiceNo, InvoiceDate
1, 1, 250, 3423523, 12/10/2010
2, 1, 340, 5634534, 08/11/2010
3, 2, 125, 9258143, 10/02/2010

维护表：

MaintenanceID, MainID, Cost, InvoiceNo, InvoiceDate
1, 1, 223, 9694534, 07/03/2009
2, 2, 830, 4259943, 01/02/2011

所有表都是通过MainTable的MainID链接的。

我希望从每个PlateNo的Info表中的给定'Location'的两个日期（InvoiceDate）之间的维修，SUM（成本）维修中获得SUM（成本）。

Answer 1

我会使用派生表来处理此查询。您可以轻松使用公用表表达式。

Select Main.MainId,
       Main.PlateNo,
       Info.Location,
       MaintenanceCosts.MaintenanceCost,
       RepairCosts.RepairCost
From   Main
       Inner Join Info
         On Main.MainId = Info.MainId
       Left Join (
         Select MainId, Sum(Cost) As MaintenanceCost
         From   Maintenance
         Where  InvoiceDate >= @StartDate
                And InvoiceDate < @EndDate
         Group By MainId
         ) As MaintenanceCosts
         On Main.MainId = MaintenanceCosts.MainId
       Left Join (
         Select MainId, Sum(Cost) As RepairCost
         From   Repairs
         Where  InvoiceDate >= @StartDate
                And InvoiceDate < @EndDate
         Group By MainId
         ) As RepairCosts
         On Main.MainId = RepairCosts.MainId
Where  Info.Location = @Location

Answer 2

尝试

select 

isnull(sum(a.[ Cost]) + sum(b.[ Cost]),0) cost,
a.[ MainID],a.[ InvoiceDate]

from 

[maintanen] a inner join 
[repairs] b 

on a.[ MainID]=b.[ MainID]


group by a.[ MainID],a.[ InvoiceDate]

COMBINE LOCATION

使用条件计算不同表中的SUM

2 个答案: