Question

我有2个不同的查询。是否可以结合这些查询？如果有可能我该怎么办？

      SELECT LatofTruck=Lat, LngofTruck=Lng, SpeedofTruck=Speed 

      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

查询2：http://pastebin.com/Esx36JHU

       SELECT a_TankLevel1,a_TankLevel2,d_AlertStation,StateOutAlarm,StateOutValve,

       SensorDataPackage.DeviceID,Branch.FirmName,LatofDealer=Branch.Lat,

       LngofDealer=Branch.Lng,Branch.City,Branch.FirmPhone,Branch.DealerAdmin  

       FROM SensorDataPackage

       JOIN Dealer AS Branch ON Branch.DeviceID=SensorDataPackage.DeviceID

       WHERE SensorDataPackage.OID

       IN (


       SELECT MAX (SensorDataPackage.OID)

       FROM SensorDataPackage

       WHERE  SensorDataPackage.readTime > DATEADD(DAY,-100,GETDATE())

       GROUP BY SensorDataPackage.DeviceID

       )

       ORDER BY SensorDataPackage.readTime DESC

Answer 1

您可以使用UNION ALL，但必须确保列数和列类型相同。所以：

select a, b, c, from x
union all
select p, q, r, s, t from y

不起作用，但

select a, b, p, q, t from x
union all
select a, b, p, q, t from y

会奏效。

所以在你的情况下，你会得到这样的东西：

-- First query.
SELECT Latitude = Lat
     , Longitude = Lng
     , SpeedofTruck = Speed
     , a_TankLevel1 = null
     , a_TankLevel2 = null
     , d_AlertStation = null
     , StateOutAlarm = null
     , StateOutValve = null
     , DeviceID = null
     , FirmName = null
     , City = null
     , FirmPhone = null
     , DealerAdmin = null
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
)

UNION ALL

-- Second query.
SELECT Latitude = Branch.Lat
     , Longitude = Branch.Lng
     , SpeedofTruck = null
     , a_TankLevel1
     , a_TankLevel2
     , d_AlertStation
     , StateOutAlarm
     , StateOutValve
     , SensorDataPackage.DeviceID
     , Branch.FirmName
     , Branch.City
     , Branch.FirmPhone
     , Branch.DealerAdmin  
   FROM SensorDataPackage
   JOIN Dealer AS Branch ON Branch.DeviceID=SensorDataPackage.DeviceID
   WHERE SensorDataPackage.OID
   IN (
     SELECT MAX (SensorDataPackage.OID)
     FROM SensorDataPackage
     WHERE  SensorDataPackage.readTime > DATEADD(DAY,-100,GETDATE())
     GROUP BY SensorDataPackage.DeviceID
   )

这将为您提供具有卡车和分支机构的纬度和经度的结果集。

Answer 2

嗨Common Table Expression会在这种情况下帮助你。如果两个表之间有一些共同因素，则可以将它们放入同一个查询中，并将数据输入到单个查询中。我已多次使用此功能。 View也是一个非常好的替代解决方案。

如何将两个不同的查询组合成一个表？

2 个答案: