有没有办法在 DuckDB 中按 15 分钟的间隔进行分组？

Question

我做了一张桌子

create table counter (
  createdat TIMESTAMP,
  tickets INT, 
  id VARCHAR
)

我想以 15 分钟为间隔对行进行分组，所以我尝试这样做：

SELECT
  SUM(tickets) AS total,
  extract(year from createdat),
  extract(month from createdat),
  extract(day from createdat),
  extract(hour from createdat)
from counter
where id = ?
group by
  extract(year from createdat),
  extract(month from createdat),
  extract(day from createdat),
  extract(hour from createdat)

通过这个查询，我只能按小时获得。但是我无法将其修改为分钟。

查询如何按 15 分钟的间隔分组？

Answer 1

为刻钟添加一个表达式：

(extract(minute from createdat) / 15)::integer

到您的专栏：

select
  sum(tickets) AS total,
  extract(year from createdat),
  extract(month from createdat),
  extract(day from createdat),
  extract(hour from createdat),
  (extract(minute from createdat) / 15)::integer
from counter
where id = ?
group by
  extract(year from createdat),
  extract(month from createdat),
  extract(day from createdat),
  extract(hour from createdat),
  (extract(minute from createdat) / 15)::integer

转换为integer 会截断除法结果的小数部分。