SQL Puzzle - 为什么我不能加入这两个子查询？

Question

我坚持使用SQL查询.

请考虑下表:

Table DG_GAME_ROUNDS    
RoundId int
GameId  int
RoundNumber int
Value   varchar(20)
Guess   varchar(20)
Answer  varchar(20)
Correct bit
Minutes int
Seconds int
Milliseconds    int

此表包含游戏回合的结果.现在,有时候你可以用手指对游戏做出回答,然后猜测时间为35或甚至0毫秒.这些答案扭曲了我的游戏结果,我想删除它们.

我想弄清楚猜测至少200毫秒长的平均猜测时间.因此,如果一个游戏有五轮,猜测为455,400,340,30,300.我想忽略30并平均剩下的四个值并获得374的平均猜测时间.不降低30的平均猜测时间将是305.

我的问题是我正在尝试加入两个子查询,并且我收到一条错误消息,指出"on"语句周围存在问题.我认为允许加入子查询.

 select vt.gameid, vt.totalms, vt.numofguesses, vt.correctguesses
from
(select    gr.gameid 
       ,  sum((gr.seconds*1000) + gr.milliseconds) as totalms
       ,  count(gr.roundid) as numofguesses
       ,  sum(cast(gr.correct as int)) as correctguesses
          from work_tables.dbo.dg_game_rounds gr (nolock)            
          group by gr.gameid 
  ) vt 
inner join  (
              select vtIII.gameid, vtIII.avgtime
              from 
                  (
                     select vtII.gameid, sum(vtII.avgms)/count(vtII.avgms) as avgtime
                     from (
                              select gr.gameid, gr.seconds * 1000 + gr.milliseconds as avgms
                              from dg_game_rounds gr (nolock)
                              where gr.seconds * 1000 + gr.milliseconds > 200
                          ) vtII
                     group by vtII.gameid
                   ) vtIII 
 on vtIII.gameid = vt.gameid

Answer 1

因为你错过了一个结局)(倒数第二行)

select vt.gameid, vt.totalms, vt.numofguesses, vt.correctguesses
from
(select    gr.gameid 
       ,  sum((gr.seconds*1000) + gr.milliseconds) as totalms
       ,  count(gr.roundid) as numofguesses
       ,  sum(cast(gr.correct as int)) as correctguesses
          from work_tables.dbo.dg_game_rounds gr (nolock)            
          group by gr.gameid 
  ) vt 
inner join  (
              select vtIII.gameid, vtIII.avgtime
              from 
                  (
                     select vtII.gameid, sum(vtII.avgms)/count(vtII.avgms) as avgtime
                     from (
                              select gr.gameid, gr.seconds * 1000 + gr.milliseconds as avgms
                              from dg_game_rounds gr (nolock)
                              where gr.seconds * 1000 + gr.milliseconds > 200
                          ) vtII
                     group by vtII.gameid
                   ) vtIII ) vtIII
 on vtIII.gameid = vt.gameid