sql - Formatting table with partitions -


what's best way of getting rows between occurrences opened , closed in postgresql?

+------------+----+------------+---------------------+ |  event_id  | id | occurrence |      datetime       | +------------+----+------------+---------------------+ | 1003603017 |  | owner_from | 12/16/2016 4:44:16  | | 1003603017 |  | owner_to   | 12/16/2016 4:44:38  | | 1003603017 |  | owner_from | 12/16/2016 4:44:38  | | 1003603017 |  | opened     | 12/16/2016 4:44:39  | | 1003603017 | b  | owner_from | 12/16/2016 7:36:23  | | 1003603017 |  | owner_to   | 12/16/2016 7:36:23  | | 1003603017 | b  | owner_to   | 12/16/2016 9:00:01  | | 1003603017 | c  | owner_from | 12/16/2016 9:00:01  | | 1003603017 |  | closed     | 12/16/2016 12:00:36 | | 1003603017 | d  | owner_from | 12/17/2016 4:25:00  | | 1003603017 | c  | owner_to   | 12/17/2016 4:25:00  | | 1003603017 | d  | owner_from | 12/17/2016 4:52:02  | | 1003603017 | d  | owner_to   | 12/17/2016 4:52:02  | | 1003603017 | d  | opened     | 12/17/2016 4:52:02  | | 1003603017 | d  | owner_to   | 12/17/2016 8:57:00  | | 1003603017 | e  | owner_from | 12/17/2016 8:57:00  | | 1003603017 | d  | closed     | 12/17/2016 12:03:10 | +------------+----+------------+---------------------+

this easy ignore nulls option on lag. here method uses cumulative maximum datetime opened , closed:

select t.* (select t.*,              max(case when occurrence = 'opened' datetime end) on (order datetime) mr_opened,              max(case when occurrence = 'closed' datetime end) on (order datetime) mr_closed,       t      ) t mr_opened > mr_closed;

notes:

  • this not include final closed. question not clear on requirement.
  • you might want partition event_id. question not clear on requirement.
  • in more recent versions of postgres, can use filter syntax instead of case.

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