按时间戳分钟在 postgres 中查询

Question

我想知道如何通过查询进行分组，我需要在我的数据库中对同一分钟的所有数据进行分组以对所有数据求和。

ws_controller_hist=>  SELECT timestamp, type, medium from default_dataset where type like 'status_devices' and timestamp> current_timestamp - interval '60 minutes' and organization_id = '9fc02db4-c3df-4890-93ac-8dd575ca5638' order by timestamp asc;

       timestamp        |      type      | medium
------------------------+----------------+--------
 2017-12-17 12:44:00+00 | status_devices | {1,0}
 2017-12-17 12:44:00+00 | status_devices | {1,0}
 2017-12-17 12:44:00+00 | status_devices | {1,0}
 2017-12-17 12:44:01+00 | status_devices | {1,0}
 2017-12-17 12:44:01+00 | status_devices | {1,0}
 2017-12-17 12:44:10+00 | status_devices | {0,1}
 2017-12-17 12:44:10+00 | status_devices | {0,1}

正在执行此查询

ws_controller_hist=>  SELECT timestamp, type, sum(medium[1]) from default_dataset where type like 'status_devices' and timestamp> current_timestamp - interval '60 minutes' and organization_id = '9fc02db4-c3df-4890-93ac-8dd575ca5638' group by timestamp, type order by timestamp asc;

       timestamp        |      type      | sum
------------------------+----------------+-----
 2017-12-17 12:44:00+00 | status_devices |   3
 2017-12-17 12:44:01+00 | status_devices |   2
 2017-12-17 12:44:10+00 | status_devices |   0

我想求和5，这是44分钟内的总和，明白吗？

Answer 1

我想你想要 date_trunc():

select date_trunc('minute', timestamp) as timestamp_min, type, 
       sum(medium[1])
from default_dataset
where type like 'status_devices' and
      timestamp > current_timestamp - interval '60 minutes' and
      organization_id = '9fc02db4-c3df-4890-93ac-8dd575ca5638'
group by timestamp_min, type
order by timestamp_min asc;

按时间戳分钟在 postgres 中查询

query in postgres by timestamp minutes

sql

postgresql

postgresql-9.3

postgresql-9.4