Question

I am trying to count events that happen in a day, which in itself is easy:

SELECT date(time),COUNT(DISTINCT comment)
FROM data
GROUP BY date(time)

But I need a day end to be set at 4pm. So all comments before 4pm is day N, and news after 4pm are day N+1. This isnt a global thing, so I’d rather not change time zone of entire program and etc. Maybe I can somehow apply timezone to this query or pad time?

Answer 1

SELECT
  DATE_ADD(date(time),
    INTERVAL case when time(time)>='16:00:00' then 1 else 0 end DAY) as day,
    COUNT(DISTINCT comment)
FROM data
GROUP BY day