結合日期，月份和年份獲得最高日期

Question

我正在開發一個游戲，其中有一個名為punishment表，具有以下模式

CREATE TABLE Punishment
(
  PunishmentId int identity(1,1) not null , 
  PunishmentDay int , 
  PunishmentMonth int , 
  PunishmentYear int ,
  GameId int 
)

PunishmentDay，PunishmentMonth，PunishmentYear是可以為零或為null或任何數字的數字。

GameId可以在此表中重復，這意味着我可以對同一游戲進行多次懲罰。

現在我的問題是我必須獲得其中punishmentId最高的刑罰ID。

我嘗試了以下方法，但無法獲得最大記錄..

SELECT PunishmentId, DATEADD(DD,PunishmentDay,DATEADD(MM,PunishmentMonth,(DATEADD(YY,PunishmentYear,GETDATE()))))

   FROM Punishment

Answer 1

您可以使用ROW_NUMBER（）而不是相關子查詢來查找最大年/月/日。 ROW_NUMBER（）將允許您基於order by子句分配遞增的行號。 然后，您只能選擇該行號= 1的行。嘗試如下操作：

SELECT * FROM
( SELECT PunishmentId,PunishmentDay,PunishmentMonth,PunishmentYear, DATEADD(DD,PunishmentDay,DATEADD(MM,PunishmentMonth,(DATEADD(YY,PunishmentYear,GETDATE())))) TotalDays, ROW_NUMBER() OVER(PARTITION BY GameId ORDER BY PunishmentYear, PunishmentMonth, PunishmentDay DESC) RowNumber
FROM Punishment
WHERE GameId = @GameId 
) OrderedPunishment
WHERE RowNumber = 1

注意：我還沒有檢查語法，而是根據您的語句創建了該語句（幾乎忽略了嵌套的dateadds，也許還有更好的方法）。 我也只是現在才注意到您的第二個表名ConvictCases_G ...我沒有看到那應該是懲罰。

Answer 2

我已經解決以下SQL

SELECT PunishmentId,PunishmentDay,PunishmentMonth,PunishmentYear, DATEADD(DD,PunishmentDay,DATEADD(MM,PunishmentMonth,(DATEADD(YY,PunishmentYear,GETDATE()))))

FROM Punishment

WHERE GameId=@GameId  and 
DATEADD(DD,PunishmentDay,DATEADD(MM,PunishmentMonth,(DATEADD(YY,PunishmentYear,GETDATE())))) 
= (SELECT MAX(DATEADD(DD,PunishmentDay,DATEADD(MM,PunishmentMonth,(DATEADD(YY,PunishmentYear,GETDATE())))))   FROM Punishment where GameId=@GameId)

但仍在等待是否有更好的解決方案可以..

Answer 3

這應該工作

SELECT   TOP 1 PunishmentId
FROM    
(
SELECT  TOP 100 PERCENT
        PunishmentId ,
        SUM(PunishmentDay + PunishmentMonth*30 + PunishmentYear*360) AS MaxPunishment
FROM    @p
GROUP   BY  PunishmentId
ORDER   BY  SUM(PunishmentDay + PunishmentMonth*30 + PunishmentYear*360) DESC 
)
AS X

Answer 4

您還可以使用：

SELECT TOP 1 WITH TIES 
    PunishmentId,PunishmentDay,PunishmentMonth,PunishmentYear, 
    DATEADD(DD,PunishmentDay,DATEADD(MM,PunishmentMonth,(DATEADD(YY,PunishmentYear,GETDATE())))) AS PunishmentEndDate
FROM Punishment
WHERE GameId=@GameId
ORDER BY PunishmentEndDate DESC