0

我希望将以下查询合并为一个，其中

  • scouting.jumpGate 是整数，
  • scuting.astroLoc 是一个字符串，
  • scouting.ownerguild 是一个字符串，并且
  • scouting.galaxy 是一个整数

交叉链接到另一个表（并且是我的 GROUP）：

    Select TOP 3 
        scouting.jumpGate, 
        scouting.astroLoc, 
        scouting.ownerGuild, 
        scouting.Galaxy 
FROM    scouting 
WHERE   scouting.Galaxy = 1 
AND     scouting.ownerGuild = 'TEST' 
ORDER BY    scouting.jumpGate DESC, 
            scouting.astroloc DESC;

和

    SELECT TOP 3 
        scouting.jumpGate, 
        scouting.astroLoc, 
        scouting.ownerGuild, 
        scouting.Galaxy 
FROM    scouting 
WHERE   scouting.Galaxy = 2 
AND     scouting.ownerGuild = 'TEST' 
ORDER BY    scouting.jumpGate DESC, 
            scouting.astroloc DESC;

和

    SELECT TOP 3 
        scouting.jumpGate, 
        scouting.astroLoc, 
        scouting.ownerGuild, 
        scouting.Galaxy 
FROM    scouting 
WHERE   scouting.Galaxy = 3 
AND     scouting.ownerGuild = 'TEST' 
ORDER BY    scouting.jumpGate DESC, 
            scouting.astroloc DESC;

一直持续到

    SELECT TOP 3 
        scouting.jumpGate, 
        scouting.astroLoc, 
        scouting.ownerGuild, 
        scouting.Galaxy 
FROM    scouting 
WHERE   scouting.Galaxy = 79 
AND     scouting.ownerGuild = 'TEST' 
ORDER BY    scouting.jumpGate DESC, 
            scouting.astroloc DESC;

我在微软网站上阅读了这个 Greatest N Per Group 问题后生成的代码如下：

Select  scouting.astroLoc, 
        scouting.galaxy, 
        scouting.jumpGate, 
        scouting.ownerGuild 
From    galaxy Inner Join 
        scouting On galaxy.[galaxy_ID] = scouting.galaxy 
Where   scouting.ownerGuild = 'SWARM' 
AND     (scouting.jumpGate) In (Select Top 3 scouting.jumpGate From scouting Where scouting.galaxy = galaxy.[galaxy_ID] Order By scouting.jumpGate Desc) 
Order By    scouting.astroLoc Desc, 
            scouting.jumpGate Desc

基本上，这非常接近我想要的。一切似乎都奏效了。然而，有些 GROUPS 并没有在输出中表示出来，即使在观察数据之后，每个组都有一个满足查询约束的记录。顺便说一句，如果我去掉 scouting.ownerGuild = 'SWARM' 约束，它会完美运行（但我需要这个约束）。

4

1 回答 1

0

怎么样：

Select  scouting.astroLoc, 
        scouting.galaxy, 
        scouting.jumpGate, 
        scouting.ownerGuild 
From    galaxy Inner Join 
        scouting On galaxy.[galaxy_ID] = scouting.galaxy 
WHERE   (scouting.ID) In (
             Select Top 3 scouting.ID
             From scouting 
             Where scouting.galaxy = galaxy.[galaxy_ID] 
             And scouting.ownerGuild = 'SWARM' 
             Order By scouting.jumpGate Desc) 
Order By    scouting.astroLoc Desc, 
                scouting.jumpGate Desc

否则，前 3 名似乎可能包括一些

  where scouting.ownerGuild <> 'SWARM'
于 2009-11-26T13:01:57.233 回答