在 Postgres 中分组为 2 小时的间隔

Question

我对我想做的 PostgreSQL 命令有一些困难。

select code,TIMESTAMP WITHOUT TIME ZONE 'epoch' +
INTERVAL '1 second' * round(extract('epoch' from created_at) / 7200) * 7200 as created_at,COUNT ("active" ) as active
from "otp"
GROUP BY "code", round(extract('epoch' from created_at) / 7200)

这是我的数据：

code      created_at            active
------    -------------------   ------
467380    2021-08-13 12:03:15   1
656608    2021-08-13 12:22:56   1
892624    2021-08-13 11:59:36   1
868549    2021-08-13 12:10:05   1
804703    2021-08-13 13:04:24   1

我试图以 2 小时为间隔对它们进行分组，我得到这是我当前的输出：

code      created_at            active 
------    -------------------   ------ 
467380    2021-08-13 12:00:00   1 
656608    2021-08-13 12:00:00   1 
892624    2021-08-13 12:00:00   1 
868549    2021-08-13 12:00:00   1 
804703    2021-08-13 14:00:00   1

但我想在 14 小时内将 12 小时到 14 小时之间的时间分组，而不是在 12 小时内分组，例如：

code      created_at            active 
------    -------------------   ------ 
467380    2021-08-13 14:00:00   1 
656608    2021-08-13 14:00:00   1 
892624    2021-08-13 12:00:00   1 
868549    2021-08-13 14:00:00   1 
804703    2021-08-13 14:00:00   1

我怎样才能实现它？

Answer 1

我认为你需要date_bin ：

select code,
       date_bin('2 hours', created_at, '2000-01-01 00:00:00') as created_at,
       COUNT ("active" ) as active
from "otp"
GROUP BY "code",
         date_bin('2 hours', created_at, '2000-01-01 00:00:00');