Question

我正在制作足球排名记分牌。我有一个完美的sql脚本，但我无法弄清楚排名。我在Stack Overflow上研究了所有线程，对我来说没有任何作用。我想出了如何为SQL代码添加排名，但是当显示排名时，它会给我语法错误。

到目前为止，这是代码：

select 
@rank := @rank + 1 as rank,
ekipa, 
count(case when scoreHome is not null then 1 end) P, 
count(case when scoreHome > scoreAway then 1 end) W, 
count(case when scoreAway > scoreHome then 1 end) L, 
count(case when scoreHome = scoreAway then 1 end) D, 
sum(scoreHome) GS, 
sum(scoreAway) GA, 
sum(scoreHome) - sum(scoreAway) GD,
sum(
      case when scoreHome > scoreAway then 3 else 0 end 
    + case when scoreHome = scoreAway then 1 else 0 end
) PTS 
from (
    select home ekipa, scoreHome, scoreAway from futliga_pc_liga1 
  union all
    select away, scoreAway, scoreHome from futliga_pc_liga1
) a 
group by ekipa
order by PTS desc, GD desc

所以我尝试了

    select @rank := 0

到脚本的末尾，因为我看到它在其他人的脚本上工作，但它给了我语法错误。你看到这个脚本它完美地工作只是rank列是NULL。

那么这里会出现什么问题？

Answer 1

更改了答案

将其更改为：

SELECT @rank := @rank + 1 AS rank, results.*
FROM (
    SELECT 
    ekipa, 
    COUNT(CASE WHEN scoreHome IS NOT NULL THEN 1 END) P, 
    COUNT(CASE WHEN scoreHome > scoreAway THEN 1 END) W, 
    COUNT(CASE WHEN scoreAway > scoreHome THEN 1 END) L, 
    COUNT(CASE WHEN scoreHome = scoreAway THEN 1 END) D, 
    SUM(scoreHome) GS, 
    SUM(scoreAway) GA, 
    SUM(scoreHome) - SUM(scoreAway) GD,
    SUM(
          CASE WHEN scoreHome > scoreAway THEN 3 ELSE 0 END 
        + CASE WHEN scoreHome = scoreAway THEN 1 ELSE 0 END
    ) PTS 
    FROM (
        SELECT home ekipa, scoreHome, scoreAway FROM futliga_pc_liga1 
      UNION ALL
        SELECT away, scoreAway, scoreHome FROM futliga_pc_liga1
    ) a 
    GROUP BY ekipa
    ORDER BY PTS DESC, GD DESC
) AS results
CROSS JOIN (SELECT @rank := 0) AS parameter;

<强>测试

MariaDB [bb]> SELECT @rank := @rank + 1 AS rank, results.*
    -> FROM (
    ->     SELECT
    ->     ekipa,
    ->     COUNT(CASE WHEN scoreHome IS NOT NULL THEN 1 END) P,
    ->     COUNT(CASE WHEN scoreHome > scoreAway THEN 1 END) W,
    ->     COUNT(CASE WHEN scoreAway > scoreHome THEN 1 END) L,
    ->     COUNT(CASE WHEN scoreHome = scoreAway THEN 1 END) D,
    ->     SUM(scoreHome) GS,
    ->     SUM(scoreAway) GA,
    ->     SUM(scoreHome) - SUM(scoreAway) GD,
    ->     SUM(
    ->           CASE WHEN scoreHome > scoreAway THEN 3 ELSE 0 END
    ->         + CASE WHEN scoreHome = scoreAway THEN 1 ELSE 0 END
    ->     ) PTS
    ->     FROM (
    ->         SELECT home ekipa, scoreHome, scoreAway FROM futliga_pc_liga1
    ->       UNION ALL
    ->         SELECT away, scoreAway, scoreHome FROM futliga_pc_liga1
    ->     ) a
    ->     GROUP BY ekipa
    ->     ORDER BY PTS DESC, GD DESC
    -> ) AS results
    -> CROSS JOIN (SELECT @rank := 0) AS parameter;
+------+-----------------------+---+---+---+---+------+------+------+------+
| rank | ekipa                 | P | W | L | D | GS   | GA   | GD   | PTS  |
+------+-----------------------+---+---+---+---+------+------+------+------+
|    1 | PSG (Krasoticnik)     | 1 | 1 | 0 | 0 |    3 |    1 |    2 |    3 |
|    2 | Tottenham (cuha93)    | 1 | 1 | 0 | 0 |    3 |    2 |    1 |    3 |
|    3 | FC Barcelona (zlabra) | 1 | 0 | 1 | 0 |    2 |    3 |   -1 |    0 |
|    4 | Liverpool (Jeraj99)   | 1 | 0 | 1 | 0 |    1 |    3 |   -2 |    0 |
+------+-----------------------+---+---+---+---+------+------+------+------+
4 rows in set (0.02 sec)

MariaDB [bb]>

如何在mysql记分牌表中添加排名？

1 个答案: