Question

我想在我的查询中添加新的2列.OldLat（5分钟之前的Lat），OldLat（5分钟前的Lng）

结果就像这样

LatOfTruck   LngOfTruck SpeedOfTruck   LastTime            PlateOfTruck
36.9573      27.8099       72         11.12.2013 12:30:00      123456
34.9573      27.5053       82         11.12.2013 11:30:00      541456
38.8952      37.7855       52         11.12.2013 10:30:00      78455
   .             .          .                 .                 .
   .             .          .                 .                 .
   .             .          .                 .                 .

查询：

SELECT LatOfTruck = TruckLocation.Lat,
       LngOfTruck       = TruckLocation.Lng,
       SpeedOfTruck     = TruckLocation.Speed,
       LastTime         = CONVERT(VARCHAR(10), [TruckLocation.ReadTime], 104) +
                        ' ' + CONVERT(VARCHAR(8), [TruckLocation.ReadTime], 108),
       PlateOfTruck     = Trucks.Plate
FROM   TruckLocation
JOIN   Truck AS Trucks
       ON  Trucks.OID = TruckLocation.TruckID
WHERE  TruckLocation.OID  

       IN (SELECT MAX(TruckLocation_1.OID) AS OID
           FROM   TruckLocation AS TruckLocation_1
           JOIN   Truck
                  ON  TruckLocation_1.TruckID = Truck.OID
           GROUP BY TruckLocation_1.TruckID)
ORDER BY TruckLocation.ReadTime DESC

将OldLat和OldLng结果添加为：

LatOfTruck LngOfTruck SpdOfTruck LastTime   PlateOfTruck   OldLat      OldLng
 36.9573     27.8099       72     date        123456   LatOf5mAgo  LngOf5mAgo  
 34.9573     27.8099       82     date        121456   LatOf5mAgo  LngOf5mAgo  
 38.8952     37.7855       52     date         78455   LatOf5mAgo  LngOf5mAgo  
  .              .          .       .          .            .          .       
  .              .          .       .          .            .          .      
  .              .          .       .          .            .          .

Answer 1

如果您的OldLat和OLng已修复，则可以将两者添加为

Select LatOfTruck, LngOfTruck,OldLat='LatOf5mAgo', OldLng='LngOf5mAgo'
From TbaleName

我希望你明白我的观点。不是一个确切的，但肯定会给你一个想法。以下是您的原始查询。

SELECT LatOfTruck=TruckLocation.Lat,LngOfTruck=TruckLocation.Lng,
SpeedOfTruck=TruckLocation.Speed,LastTime=CONVERT(VARCHAR(10), [TruckLocation.ReadTime], 104) + ' ' + CONVERT(VARCHAR(8),
[TruckLocation.ReadTime],108) 
,PlateOfTruck=Trucks.Plate,OldLat='LatOf5mAgo', OldLng='LngOf5mAgo' 
FROM   TruckLocation
JOIN Truck AS Trucks ON Trucks.OID=TruckLocation.TruckID
WHERE  TruckLocation.OID  IN ( SELECT  MAX(TruckLocation_1.OID) AS OID
                               FROM  TruckLocation AS TruckLocation_1
                               JOIN  Truck ON TruckLocation_1.TruckID = Truck.OID  
                               GROUP BY TruckLocation_1.TruckID
                             )
ORDER BY TruckLocation.ReadTime DESC

如何在SQL Query中添加旧时的新数据列？

1 个答案: