Sql 找到一个';运行';排序结果集中的行数

Sql 找到一个';运行';排序结果集中的行数,sql,oracle,gaps-and-islands,Sql,Oracle,Gaps And Islands,我试图找出一种方法来识别满足某些条件的结果(按顺序连续行)的“运行”。目前,我正在订购一个结果集,并用眼睛扫描特定的模式。下面是一个例子: SELECT the_date, name FROM orders WHERE the_date BETWEEN to_date('2013-09-18',..) AND to_date('2013-09-22', ..) ORDER BY the_date --------------------------

我试图找出一种方法来识别满足某些条件的结果(按顺序连续行)的“运行”。目前,我正在订购一个结果集,并用眼睛扫描特定的模式。下面是一个例子:

SELECT the_date, name
FROM orders
WHERE 
    the_date BETWEEN 
        to_date('2013-09-18',..) AND 
        to_date('2013-09-22', ..)
ORDER BY the_date

--------------------------------------
the_date            | name
--------------------------------------
2013-09-18 00:00:01 | John
--------------------------------------
2013-09-19 00:00:01 | James
--------------------------------------
2013-09-20 00:00:01 | John
--------------------------------------
2013-09-20 00:00:02 | John
--------------------------------------
2013-09-20 00:00:03 | John
--------------------------------------
2013-09-20 00:00:04 | John
--------------------------------------
2013-09-21 16:00:01 | Jennifer
--------------------------------------
我想从这个结果集中提取的是
2013-09-20
上归属于
John
的所有行。一般来说,我要查找的是来自同一
名称的运行结果,一行>=3。我正在使用Oracle 11,但我想知道这是否可以通过严格的SQL实现,或者是否必须使用某种分析功能。

试试这个

WITH ORDERS
    AS (SELECT
             TO_DATE ( '2013-09-18 00:00:01',
                     'YYYY-MM-DD HH24:MI:SS' )
                 AS THE_DATE,
             'John' AS NAME
        FROM
             DUAL
        UNION ALL
        SELECT
             TO_DATE ( '2013-09-19 00:00:01',
                     'YYYY-MM-DD HH24:MI:SS' )
                 AS THE_DATE,
             'James' AS NAME
        FROM
             DUAL
        UNION ALL
        SELECT
             TO_DATE ( '2013-09-20 00:00:01',
                     'YYYY-MM-DD HH24:MI:SS' )
                 AS THE_DATE,
             'John' AS NAME
        FROM
             DUAL
        UNION ALL
        SELECT
             TO_DATE ( '2013-09-20 00:00:02',
                     'YYYY-MM-DD HH24:MI:SS' )
                 AS THE_DATE,
             'John' AS NAME
        FROM
             DUAL
        UNION ALL
        SELECT
             TO_DATE ( '2013-09-20 00:00:03',
                     'YYYY-MM-DD HH24:MI:SS' )
                 AS THE_DATE,
             'John' AS NAME
        FROM
             DUAL
        UNION ALL
        SELECT
             TO_DATE ( '2013-09-20 00:00:04',
                     'YYYY-MM-DD HH24:MI:SS' )
                 AS THE_DATE,
             'John' AS NAME
        FROM
             DUAL
        UNION ALL
        SELECT
             TO_DATE ( '2013-09-21 16:00:01',
                     'YYYY-MM-DD HH24:MI:SS' )
                 AS THE_DATE,
             'Jennifer' AS NAME
        FROM
             DUAL)
SELECT
      B.*
FROM
      (SELECT
            TRUNC ( THE_DATE ) THE_DATE,
            NAME,
            COUNT ( * )
       FROM
            ORDERS
       WHERE
            THE_DATE BETWEEN TRUNC ( TO_DATE ( '2013-09-18',
                                        'YYYY-MM-DD' ) )
                       AND TRUNC ( TO_DATE ( '2013-09-22',
                                        'YYYY-MM-DD' ) )
       GROUP BY
            TRUNC ( THE_DATE ),
            NAME
       HAVING
            COUNT ( * ) >= 3) A,
      ORDERS B
WHERE
      A.NAME = B.NAME
      AND TRUNC ( A.THE_DATE ) = TRUNC ( B.THE_DATE );
输出

9/20/2013 12:00:01 AM   John
9/20/2013 12:00:02 AM   John
9/20/2013 12:00:03 AM   John
9/20/2013 12:00:04 AM   John

您需要多个嵌套窗口函数:

SELECT *
FROM
 (
   SELECT the_date, name, grp,
      COUNT(*) OVER (PARTITION BY grp) AS cnt
   FROM
    (
      SELECT the_date, name, 
         SUM(flag) OVER (ORDER BY the_date) AS grp
      FROM
       (
         SELECT the_date, name, 
            CASE WHEN LAG(name) OVER (ORDER BY the_date) = name THEN 0 ELSE 1 END AS flag
         FROM orders
         WHERE 
             the_date BETWEEN 
                 TO_DATE('2013-09-18',..) AND 
                 TO_DATE('2013-09-22', ..)
       ) dt
    ) dt
 ) dt
WHERE cnt >= 3
ORDER BY the_date

你能把预期的结果公布吗?你所说的运行是什么意思?@realspirituals我解释了预期的输出以及我所说的“运行”结果是什么意思。这还不清楚吗?请看我的帖子,并确认这就是您要寻找的……对不起,我在定义“运行”时没有正确解释自己,而且我没有提供足够好的数据示例。我要找的是,当同一个人按顺序出现3行或更多行时。如果Jane在同一天有4行,但它们不符合顺序,则不应返回她的数据。不过我会更新这个问题。真的很酷的解决方案。不知道滞后函数。在接下来的几天里,我也会花一些时间真正熟悉