在postgresql中，如何按顺序计算重复分区中的运行数？

我有一个用户完成了一系列事件。我想记录他们完成每个事件的次数以及顺序

因此，对于下表用户事件：

我应该得到：

name  eventname  event_sequence_number  time_started  frequency
Ted   a          1                      12:01         1
Ted   b          2                      12:02         3
Ted   c          3                      12:05         1
Ted   b          4                      12:06         2
Ted   c          5                      12:08         1
Ted   b          6                      12:09         3

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我一直在尝试排名，密集排名，行数和滞后，但不能把它们放在一起。有什么想法吗？

试试这个。它使用Tabibitosan方法对序列范围进行分组：

PostgreSQL 9.6架构设置：

问题1：

:

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一段漂亮的代码——我最终创造了一些类似的东西。对于通过聚合数百万在线用户行为创建更清晰的路径分析非常有用。

name  eventname  event_sequence_number  time_started  frequency
Ted   a          1                      12:01         1
Ted   b          2                      12:02         3
Ted   c          3                      12:05         1
Ted   b          4                      12:06         2
Ted   c          5                      12:08         1
Ted   b          6                      12:09         3

CREATE TABLE user_events
    (user_name varchar(3), eventname varchar(1), event_time time)
;

INSERT INTO user_events
    (user_name, eventname, event_time)
VALUES
    ('Ted', 'a', '12:01'),
    ('Ted', 'b', '12:02'),
    ('Ted', 'b', '12:03'),
    ('Ted', 'b', '12:04'),
    ('Ted', 'c', '12:05'),
    ('Ted', 'b', '12:06'),
    ('Ted', 'b', '12:07'),
    ('Ted', 'c', '12:08'),
    ('Ted', 'b', '12:09'),
    ('Ted', 'b', '12:11'),
    ('Ted', 'b', '12:12')
;

SELECT t.user_name
    ,t.eventname
    ,row_number() OVER (
        ORDER BY MIN(event_time)
        ) AS event_sequence_number
    ,MIN(event_time) AS time_started
    ,COUNT(*) as frequency
FROM (
    SELECT user_name
        ,eventname
        ,event_time
        ,row_number() OVER (
            ORDER BY event_time
            ) - row_number() OVER (
            PARTITION BY eventname ORDER BY event_time
                ,eventname
            )  seq
    FROM user_events
    ) t
GROUP BY user_name
    ,eventname
    ,seq
ORDER BY time_started

| user_name | eventname | event_sequence_number | time_started | frequency |
|-----------|-----------|-----------------------|--------------|-----------|
|       Ted |         a |                     1 |     12:01:00 |         1 |
|       Ted |         b |                     2 |     12:02:00 |         3 |
|       Ted |         c |                     3 |     12:05:00 |         1 |
|       Ted |         b |                     4 |     12:06:00 |         2 |
|       Ted |         c |                     5 |     12:08:00 |         1 |
|       Ted |         b |                     6 |     12:09:00 |         3 |