Truy vấn 'chạy' các cột liên tiếp trong Postgres

Đây là giải pháp NHẬN CTE. (các vấn đề về đảo và khoảng trống tự nhiên cho phép CTE đệ quy)

WITH RECURSIVE runrun AS (
    SELECT event_id, event_time
    , event_time - ('30 sec'::interval) AS low_time
    , event_time + ('30 sec'::interval) AS high_time
    FROM table1
    UNION
    SELECT t1.event_id, t1.event_time
    , LEAST ( rr.low_time, t1.event_time - ('30 sec'::interval) ) AS low_time
    , GREATEST ( rr.high_time, t1.event_time + ('30 sec'::interval) ) AS high_time
    FROM table1 t1
    JOIN runrun rr ON t1.event_time >= rr.low_time
                  AND t1.event_time < rr.high_time
    )
SELECT DISTINCT ON (event_id) *
FROM runrun rr
WHERE rr.event_time >= '2011-01-01 00:00:15'
AND rr.low_time <= '2011-01-01 00:00:15'
AND rr.high_time > '2011-01-01 00:00:15'
    ;

Kết quả:

 event_id |     event_time      |      low_time       |      high_time      
----------+---------------------+---------------------+---------------------
        2 | 2011-01-01 00:00:15 | 2010-12-31 23:59:45 | 2011-01-01 00:00:45
        3 | 2011-01-01 00:00:29 | 2010-12-31 23:59:45 | 2011-01-01 00:01:28
        4 | 2011-01-01 00:00:58 | 2010-12-31 23:59:30 | 2011-01-01 00:01:28
(3 rows)