如何将日期按5天分组，而不是按周将标准date_trunc分组

Question

我需要按5天的增量将日期分组，而不是标准的date_trunc('week',date)，以便对该分组进行count(*)

有人可以帮助我吗？

提前谢谢

Answer 1

您将获得最短的日期，取差值并除以5：

select ( datediff(day, min_date, date) / 5 )::int as period_num,
       count(*)
from (select t.*, min(date) over (order by date) as min_date
      from t
     ) t
group by 1;