使用SQL中的子查詢更新多行

Question

我有一個彙總表從主表中返回數據。我試圖從主表中的值作爲更新等一些總結的數據：

update #summary 
    set TopSpeed = CD.TopSpeed, SpeedTime = CD.TimeSent, SpeedDriver = CD.Driver 
from 
(
    select top 1 TopSpeed, TimeSent, Driver 
    from CarData 
    where CarData.VehicleId = #summary.VehicleId 
    and CarData.TimeSent between #summary.Start and #summary.Stop 
    order by CarData.TopSpeed desc, TimeSent desc 
) as CD 

的#summary臨時表創建有關汽車進行旅行彙總數據。每次旅行都有多次旅行，每次旅行都有開始和結束時間。 CarData表包含所有詳細的汽車數據，如速度和位置等。

請幫助你嗎？

感謝， 羅伯特

Answer 1

試試這個：

UPDATE 
    #summary 
SET 
    #summary.TopSpeed = CarData.TopSpeed , 
    #summary.SpeedTime = CarData.SpeedTime 
    ... 
FROM 
    #summary 
INNER JOIN 
    CarData 
ON 
    #summary.id = CarData.id AND (CarData.TimeSent BETWEEN #summary.Start AND #summary.Stop) 

Answer 2

如果這裏有一個辦法做到這一點，雖然我不喜歡做的子查詢3次。這是我希望有人有更好的主意的情況之一。

update #summary 
    set TopSpeed = 
    (
     select top 1 TopSpeed 
     from CarData 
     where CarData.VehicleId = #summary.VehicleId 
     and CarData.TimeSent between #summary.Start and #summary.Stop 
     order by CarData.TopSpeed desc, TimeSent desc 
) 
    SpeedTime = 
    (
     select top 1 SpeedTime 
     from CarData 
     where CarData.VehicleId = #summary.VehicleId 
     and CarData.TimeSent between #summary.Start and #summary.Stop 
     order by CarData.TopSpeed desc, TimeSent desc 
) 
    SpeedDriver = 
    (
     select top 1 SpeedDriver 
     from CarData 
     where CarData.VehicleId = #summary.VehicleId 
     and CarData.TimeSent between #summary.Start and #summary.Stop 
     order by CarData.TopSpeed desc, TimeSent desc 
    )