MySql：如何仅获得四个唯一结果？

Question

我试图仅获得这四个突出显示的结果。我尝试将它们分组，但仍未获得所需的结果。

查询是：-

Set @filter := 0.00;

SELECT autorates2.ID, autorates2.Car, autorates2.Origin ,  autorates2.Destination, autorates2.Carrier,  
@FuelLevy := ( autorates2.Buy * Carrier.FuelLevy) + autorates2.Buy AS 'AfterFuelLevy',
@GST :=(@FuelLevy * 0.10) + @FuelLevy AS 'AfterGST',
@filter := (Select Margin.MarginPer from Margin where @GST between Margin.Low and Margin.High ),
@Margin :=  (@filter * @GST) + @GST  AS 'Sell',
autorates2.OriginType, autorates2.DestinationType, CONCAT(autorates2.OriginType, autorates2.DestinationType) as'ser'
from  Margin, Carrier 
RIGHT JOIN autorates2 on autorates2.Carrier =  Carrier.Carrier 
Where  autorates2.Origin = 'Melbourne' AND autorates2.Destination = 'Sydney' AND autorates2.Car = '4WD/Van'  AND Carrier.Disabled  = 0 AND autorates2.GoodsAllowed = 0   
Group by   ser
ORDER by  MIN(Sell),ser

我得到的输出是突出显示的结果是错误的地方：-

这是所需的实际结果。

表1：

表2：

表3：

Answer 1

按以下方式使用相关子查询，因为您没有共享所有源列名称，所以我猜价格是一列

     select * from yourtable t1 where price in     
       (
        select min(price) from yourtable t2 where t1.car=t2.car
        and t1.depot=t2.depot and t1.door=t2.door
        and t1.destinationtype=t2.destinationtype and t1.ser=t2.ser      
        )