Question

I’m using postgres (postgis) and i want to perform a query that returns all rows that have a timestamp within an hour of each other.

What would the SQL statement look like?

The table looks like this:

• id { integer }
• name { character varying }

• timestamp { timestamp with time zone }

  id   name       timestamp
  ---+----------+--------------------------------
  1    one        "2010-09-24 21:10:39.515+00"
  2    two        "2010-09-16 09:21:09.362+00"
  3    three      "2010-07-08 00:00:46.549+00"
  

EDIT #1

Here’s a better example. (with help from Tometzky) All the results are within 1 hour of each other. That is, for every row give me any other rows that are within 1 hour:

select * from myTable order by t

 id |               t               
----+-------------------------------
  9 | 2011-07-15 18:20:20.05+02
 10 | 2011-07-15 19:05:00.05+02
 11 | 2011-07-15 19:40:20.05+02
 13 | 2011-07-15 20:31:01.05+02
 14 | 2011-07-15 20:35:11.05+02
(5 rows)

result of needed query:

 id |  matchid |  origTime                  | matchTime
----+----------+----------------------------+------------------------------
  9 |   10     | 2011-07-15 18:20:20.05+02  | 2011-07-15 19:05:00.05+02
 10 |    9     | 2011-07-15 19:05:00.05+02  | 2011-07-15 18:20:20.05+02
 10 |   11     | 2011-07-15 19:05:00.05+02  | 2011-07-15 19:40:20.05+02
 11 |   10     | 2011-07-15 19:40:20.05+02  | 2011-07-15 19:05:00.05+02
 11 |   13     | 2011-07-15 19:40:20.05+02  | 2011-07-15 20:31:01.05+02
 11 |   14     | 2011-07-15 19:40:20.05+02  | 2011-07-15 20:35:11.05+02
 13 |   11     | 2011-07-15 20:31:01.05+02  | 2011-07-15 19:40:20.05+02
 13 |   14     | 2011-07-15 20:31:01.05+02  | 2011-07-15 20:35:11.05+02
 14 |   11     | 2011-07-15 20:35:11.05+02  | 2011-07-15 19:40:20.05+02
 14 |   13     | 2011-07-15 20:35:11.05+02  | 2011-07-15 20:31:01.05+02
(10 rows)

Answer 1

select 
    t0.id, t1.id as matchid, 
    t0.ts as origTime, t1.ts as matchTime
from t t0
inner join t t1 on 
    t1.ts between 
        t0.ts - interval '1 hour'
        and 
        t0.ts + interval '1 hour'
    and t0.id != t1.id
;