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我有一个这样的数据集——

**Team  Date    W/L**
Team_1  04/01/0012  W
Team_1  06/01/0012  W
Team_1  07/01/0012  L
Team_1  14/01/0012  W
Team_1  19/01/0012  W
Team_1  30/01/0012  L
Team_1  14/02/0012  W
Team_1  17/02/0012  L
Team_1  20/02/0012  W
Team_2  01/01/0012  W
Team_2  05/01/0012  W
Team_2  09/01/0012  W
Team_2  13/01/0012  L
Team_2  18/01/0012  W
Team_2  25/01/0012  L
Team_2  05/02/0012  L
Team_2  13/02/0012  L
Team_2  19/02/0012  L
Team_3  02/01/0012  W
Team_3  02/01/0012  W
Team_3  06/01/0012  W
Team_3  10/01/0012  W
Team_3  19/01/0012  W
Team_3  31/01/0012  L
Team_3  11/02/0012  W
Team_3  15/02/0012  L
Team_3  21/02/0012  W

从这里我需要找出谁获得了最大的连续胜利——

团队人数

Team_3  5
Team_2  3
Team_1  2

我被允许只写 sql 查询。我怎么写这个？

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1 回答 1

2

您可以使用以下内容：

SELECT  Team, TotalWins, FirstWin, LastWin
FROM    (   SELECT  Team, 
                    WL,
                    COUNT(*) TotalWins,
                    MIN("Date") FirstWin,
                    MAX("Date") LastWin,
                    ROW_NUMBER() OVER(PARTITION BY Team, WL ORDER BY COUNT(*) DESC) RowNumber
            FROM    (   SELECT  Team,
                                "Date",
                                WL, 
                                ROW_NUMBER() OVER(PARTITION BY Team ORDER BY "Date") - ROW_NUMBER() OVER(PARTITION BY Team, WL ORDER BY "Date") Grouping
                        FROM    T
                    ) GroupedData
            WHERE   WL = 'W'
            GROUP BY Team, WL, Grouping
        ) RankedData
WHERE   RowNumber = 1;

它使用 ROW_NUMBER 对按团队划分的每场比赛进行排名，并且还按结果，这两者之间的差异对于每组连续结果都是唯一的。因此，对于您的第一个团队，您将拥有：

Team    Date        W/L RN1     RN2 DIFF
Team_1  04/01/0012  W   1       1   0
Team_1  06/01/0012  W   2       2   0
Team_1  07/01/0012  L   3       1   2
Team_1  14/01/0012  W   4       3   1
Team_1  19/01/0012  W   5       4   1
Team_1  30/01/0012  L   6       2   4
Team_1  14/02/0012  W   7       5   2
Team_1  17/02/0012  L   8       3   5
Team_1  20/02/0012  W   9       6   3

其中 RN1 只是按团队分区，而 rn2 是按团队和结果分区。

如您所见，如果您删除损失，则 DIFF 列对于每组连续胜利增加 1：

Team    Date        W/L RN1     RN2 DIFF
Team_1  04/01/0012  W   1       1   0
Team_1  06/01/0012  W   2       2   0
---------------------------------------
Team_1  14/01/0012  W   4       3   1
Team_1  19/01/0012  W   5       4   1
---------------------------------------
Team_1  14/02/0012  W   7       5   2
---------------------------------------
Team_1  20/02/0012  W   9       6   3

然后，您可以按此分组以确保您看到的是连续胜利，并进行计数以获得最多。然后我只是使用另一个行号来获得每支球队的最大连续胜利。

SQL Fiddle 示例

于 2013-09-24T10:56:27.907 回答