这是递归CTE解决方案。（孤岛和空白问题自然会导致递归CTE）
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 rrWHERe 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' ;结果：
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)
