Question

我很难获得以下查询：

假设我有一个包含大量球队的桌子，每个球队有15个球员（对阵球员表一对多）。

这些玩家在团队中通过Order列从0到14进行排序，并具有两个属性：

得分（整数）
wasSick（布尔值，或整数，值为0表示false或1表示true）

我想要一个为每个团队返回行的查询，其中第一列是团队ID（主键），第二列是从第一列得分的总和使用Order列定义的订单，每个团队的11名玩家没有生病。

如果有超过3名球员因为一支球队而生病，那么它将使用所有剩余球员。

这是针对 Oracle 数据库的。我尝试使用ROWNUM但是我需要一个类似的rownum来重置每个聚合。查询可能包含子查询或使用WITH子句。

谢谢！

PD：如果你猜对了，他们就是足球/足球队。

修改

用于了解团队中球员顺序的属性是订单栏。我们称之为位置列，它具有0到14之间的整数。因此，如果在一个团队中，玩家2和4生病了，我需要玩家0,1,3,5,6的积分总和， 7,8,9,10,11和12。

我的尝试是这样的：

SELECT t.id, sum(p.points) FROM team t, points p WHERE p.t_id = t.id AND p.wasSick = 0 AND ROWNUM < 12 GROUP BY p.t_id

这里有什么问题我错过了ORDER BY p.position并且ROWNUM不会在团队之间重置。

Answer 1

由于没有引用可用于识别前11名球员的球场（如果球队中没有球员生病），我使用了rowid来命令他们。如果您可以使用这样的字段更新问题，我可以更改查询。直到那时：

SELECT team_id,
       SUM(points)
  FROM (
        SELECT t.team_id, 
               p.points
               ROW_NUMBER() OVER(PARTITION BY team_id ORDER BY player_id, p.rowid) rn
          FROM teams t, players p
              WHERE t.team_id = p.team_id
                AND p.wasSick = 0
        )
 WHERE rn < 12
 GROUP BY team_id

Answer 2

这个怎么样：

select teamid, 
       sum(pointscored)
  from (select teamid, 
               pointscored, 
               row_number() over (partition by teamid order by orderid) rn
          from (select 1 teamid, 1 playerid, 0 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 2 playerid, 1 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 3 playerid, 2 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 4 playerid, 3 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 5 playerid, 4 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 6 playerid, 5 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 7 playerid, 6 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 8 playerid, 7 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 9 playerid, 8 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 10 playerid, 9 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 11 playerid, 10 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 12 playerid, 11 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 13 playerid, 12 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 14 playerid, 13 orderid, 1 pointscored, 0 wassick from dual union all
                select 1 teamid, 15 playerid, 14 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 1 playerid, 0 orderid, 1 pointscored, 1 wassick from dual union all
                select 2 teamid, 2 playerid, 1 orderid, 1 pointscored, 1 wassick from dual union all
                select 2 teamid, 3 playerid, 2 orderid, 1 pointscored, 1 wassick from dual union all
                select 2 teamid, 4 playerid, 3 orderid, 1 pointscored, 1 wassick from dual union all
                select 2 teamid, 5 playerid, 4 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 6 playerid, 5 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 7 playerid, 6 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 8 playerid, 7 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 9 playerid, 8 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 10 playerid, 9 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 11 playerid, 10 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 12 playerid, 11 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 13 playerid, 12 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 14 playerid, 13 orderid, 1 pointscored, 0 wassick from dual union all
                select 2 teamid, 15 playerid, 14 orderid, 1 pointscored, 0 wassick from dual
               ) teams
         where wassick = 0
       )
 where rn <= 11
group by teamid;

返回：

    TEAMID SUM(POINTSCORED)
---------- ----------------
         1               11
         2               11

2 rows selected.

多个前n个查询

2 个答案: