另一个子查询使用从子查询的列和选择子查询

Question

多列，请看看下面的SQL查询：

我想存储在@startlog列值log_LogId（6号线），这样我可以稍后在第15行使用它。还是有任何其他方式来实现这一目标？

我不能写在一行6 @log_LogId = log_LogId它显示语法错误。

另一个问题是，我怎么能在第一子查询中选择多个列？也许喜欢 (SELECT TOP 1 log_LogId, log_Cost .....？

在此先感谢。

DECLARE @startlog INT 
SELECT 
    log_VehicleId AS gpsId, 
    log_LogId AS ignOnLogId, 
    (SELECT TOP 1 
     log_LogId ---Set this value to @startlog so that I can use this in "HERE" 
      --- Also Select another column here 
     FROM VehicleLog 
     WHERE log_Eventid = 6012 AND log_LogId > v2.log_LogId 
     AND log_VehicleId = v2.log_VehicleId 
    ) ignOffLogId, 
    (SELECT SUM(CAST(log_COG AS FLOAT)) 
     FROM VehicleLog 
     WHERE log_LogId >= v2.log_LogId 
     AND log_LogId <= @startlog ---**HERE** 
    ) 
from VehicleLog v2 
WHERE log_Eventid = 6011 AND log_LogId < 300 

Answer 1

可以使用CTE（公共表表达式）如下：

;WITH CTE_V2 AS 

(

    SELECT 

     log_VehicleId 
     , log_LogId 
    FROM 
     VehicleLog 

    WHERE 
     log_Eventid = 6011 AND log_LogId < 300 

) 

, CTE_IGN_OFF AS 

(

    SELECT TOP 1 

     log_LogId ---Set this value to @startlog so that I can use this in "HERE" 

     ,log_OtherColumn --- Also Select another column here 

    FROM 
     VehicleLog 

    WHERE 
     log_Eventid = 6012 
     AND log_LogId > (SELECT MAX(CTE_V2.log_LogId) 
       FROM CTE_V2 WHERE VehicleId = CTE_V2.log_VehicleId) 
) 
, CTE_COG AS 
(
    SELECT 
     log_VehicleId AS gpsId 
     , log_LogId AS ignOnLogId 
     , SUM(CAST(log_COG AS FLOAT)) sum_COG 
     FROM 
     VehicleLog 
     WHERE 
     log_LogId >= (SELECT MAX(CTE_V2.log_LogId) 
       FROM CTE_V2 WHERE VehicleId = CTE_V2.log_VehicleId) 
      AND log_LogId <= (SELECT TOP 1 log_OtherColumn FROM CTE_IGN_OFF) 
    GROUP BY 
     log_VehicleId 
     , log_LogId 
) 
SELECT * FROM CTE_COG;