SQL总和为5

Question

我正在尝试从表中过滤掉某些内容。结果应包括[时间]，[第1段]，[第2段..... [获胜率]，[前5名PL的总和] .....等。但是，我不知道如何编码[前5位PL的总和]。如果有人可以帮助我，我将非常高兴。在此先感谢

SELECT
        ([Time]/500)*500 as [Time]
        ,[Para1]
      ,[Para2]
       ,SUM([PL]) as [Total Profit]
      ,AVG([PL]) as [AVERAGE]
      ,COUNT(*) as [Record Count]
      ,SUM(CASE WHEN [PL]>0 THEN 1 ELSE 0 END) as [WinCount]
      ,CAST (SUM(CASE WHEN [PL]>0 THEN 1 ELSE 0 END) as float) / CAST( COUNT(*)  AS float) as [WINRATE]
      ,MIN([PL]) as [MaxDrawdown]
      ,MAX([PL]) as [MaxProfit]
      ,***************I dunno what to write here*********** [sum of top 5 PL]
      ,AVG(ABS(PL)) as [Average Change]


  FROM [BackTest].[dbo].[HSI_SMA_VB]
  GROUP BY 
        [Para1]
      ,[Para2]
      ,([Time]/500)*500
  HAVING COUNT(*) >= 30

ORDER BY [Average] DESC

Answer 1

您可以使用以下内容总结前5个PL。

SELECT SUM(top_count)
FROM (
    SELECT TOP(5) PL as top_count
    FROM test order by top_count desc
) as t;