Question

我有一个数据库，可记录7场橄榄球比赛的球队和比分。球队每周都会改变，但每次球员进入一支获胜球队时，他们都会获得3分（1分为平局0表示亏损）。

我希望能够选择身份证号为21的玩家，制作他参加过的游戏列表，然后与其他玩家一起玩总点数和游戏。

我一直在创建查询，以便在过去几个小时内对此进行评估，但似乎无法破解它。我的流程如下：

1）列出玩家21玩过的所有游戏

2）列出在玩家21玩过的游戏中玩过的所有玩家ID。

3）对于上面列出的每个玩家ID，当他们出现在玩家21玩过的任何游戏中时，请将列出的玩家ID的总分数计算在内，并计算他们出现的次数。

1）列出玩家21玩过的所有游戏

    mysql> SELECT Game, GameDate, Team, PlayerID FROM Teams WHERE PlayerID='21';
    +------+------------+------+----------+
    | Game | GameDate   | Team | PlayerID |
    +------+------------+------+----------+
    | A    | 2017-01-10 | A    |       21 |
    | A    | 2017-01-17 | A    |       21 |
    | A    | 2017-01-24 | A    |       21 |
    | B    | 2017-01-10 | A    |       21 |
    | B    | 2017-01-17 | A    |       21 |
    | B    | 2017-01-24 | A    |       21 |
    | C    | 2017-01-10 | A    |       21 |
    | C    | 2017-01-17 | A    |       21 |
    +------+------------+------+----------+
    8 rows in set (0.00 sec)

2）列出在玩家21玩过的游戏中玩过的所有玩家ID。

如果我尝试使用LIMIT 1 OFFSET 0运行此查询，则会出现more than one row selected错误。

mysql> 
SELECT PlayerID, Game, GameDate, Team 
FROM Teams 
WHERE Game=(SELECT Game FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 0) 
AND GameDate=(SELECT GameDate FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 0) 
AND Team=(SELECT Team FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 0);
        +----------+------+------------+------+
        | PlayerID | Game | GameDate   | Team |
        +----------+------+------------+------+
        |        5 | A    | 2017-01-10 | A    |
        |        8 | A    | 2017-01-10 | A    |
        |       11 | A    | 2017-01-10 | A    |
        |       12 | A    | 2017-01-10 | A    |
        |       14 | A    | 2017-01-10 | A    |
        |       15 | A    | 2017-01-10 | A    |
        |       21 | A    | 2017-01-10 | A    |
        +----------+------+------------+------+
        7 rows in set (0.00 sec)

这列出了在第一场比赛/第一场比赛中所有参赛者，其中包括玩家21。

是否有某种形式的loop我可以将此查询加入OFFSET @X以便我可以将所有这些游戏和玩家ID列在一个表中列出？

这就是我的尝试：

SET @GameNumber = (SELECT Count(*) FROM Teams WHERE PlayerID='21');
SET @GameCount = 0;
SELECT PlayerID, Game, GameDate, Team 
FROM Teams            
    WHILE(@GameNumber < @GameCount) DO
        WHERE Game=(SELECT Game FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET @GameNumber) 
        AND GameDate=(SELECT GameDate FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET @GameNumber) 
        AND Team=(SELECT Team FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET @GameNumber);
    SET @GameNumber = @GameNumer+1;
    END WHILE;

编辑1

我已经达到了这样的程度，我至少可以玩其他玩家玩过21的游戏。

SELECT Players.PlayerID, COUNT(*) AS Games 
FROM Teams, Players

WHERE 
Teams.PlayerID=Players.PlayerID
AND
(
        (
        Game=(SELECT Game FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 0) 
        AND GameDate=(SELECT GameDate FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 0) 
        AND Team=(SELECT Team FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 0)
        )
        or
        (
        Game=(SELECT Game FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 1) 
        AND GameDate=(SELECT GameDate FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 1) 
        AND Team=(SELECT Team FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 1)
        )
        or
        (
        Game=(SELECT Game FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 2) 
        AND GameDate=(SELECT GameDate FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 2) 
        AND Team=(SELECT Team FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 2)
        )
        or
        (
        Game=(SELECT Game FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 3) 
        AND GameDate=(SELECT GameDate FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 3) 
        AND Team=(SELECT Team FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 3)
        )
        or
        (
        Game=(SELECT Game FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 4) 
        AND GameDate=(SELECT GameDate FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 4) 
        AND Team=(SELECT Team FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 4)
        )
        or
        (
        Game=(SELECT Game FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 5) 
        AND GameDate=(SELECT GameDate FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 5) 
        AND Team=(SELECT Team FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 5)
        )
        or
        (
        Game=(SELECT Game FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 6) 
        AND GameDate=(SELECT GameDate FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 6) 
        AND Team=(SELECT Team FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 6)
        )
        or
        (
        Game=(SELECT Game FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 7) 
        AND GameDate=(SELECT GameDate FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 7) 
        AND Team=(SELECT Team FROM Teams WHERE PlayerID='21' LIMIT 1 OFFSET 7)
        )
)
GROUP BY Teams.PlayerID
ORDER BY Games DESC
;

以上为您提供此表：

+----------+-------+
| PlayerID | Games |
+----------+-------+
|       15 |     8 |
|       21 |     8 |
|        8 |     8 |
|       14 |     6 |
|        5 |     6 |
|       19 |     5 |
|       11 |     5 |
|       10 |     3 |
|       12 |     3 |
|        4 |     2 |
+----------+-------+
10 rows in set (0.01 sec)

Answer 1

Lads，谈论成为我的初学者。我只是在查看subquery returns more than 1 row错误，我遇到了ANY。一个3个字母的单词，让我的生活更轻松。

SET @IDNumber := 21;
SELECT Players.PlayerID, Players.Name, COUNT(Games.Points) AS Games_Played, SUM(Games.Points) AS Points, SUM(Points/Games_Played) AS Points_Per_Game
FROM Teams, Players, Games

WHERE 
Teams.PlayerID=Players.PlayerID
AND
Games.Game=Teams.Game
AND
Games.Team=Teams.Team
AND
Games.GameDate=Teams.GameDate
AND
(
CONCAT(Games.Game, '_', Games.Team, '_', Games.GameDate)= ANY(SELECT CONCAT(Teams.Game, '_', Teams.Team, '_', Teams.GameDate) FROM Teams WHERE PlayerID=@IDNumber)
)

GROUP BY Teams.PlayerID
ORDER By Points_per_Game DESC, Points DESC, Games_Played
;

使用多行数据创建视图以进行比较选择

1 个答案: