SQL Server Group by Count of DateTime Per Hour?

user_139618 0
Viewed 153733
    create table #Events
(
    EventID int identity primary key,
    StartDate datetime not null,
    EndDate datetime not null
)
go
insert into #Events (StartDate, EndDate)
select '2007-01-01 12:44:12 AM', '2007-01-01 12:45:34 AM' union all
select '2007-01-01 12:45:12 AM', '2007-01-01 12:46:34 AM' union all
select '2007-01-01 12:46:12 AM', '2007-01-01 12:47:34 AM' union all
select '2007-01-02 5:01:08 AM', '2007-01-02 5:05:37 AM' union all
select '2007-01-02 5:50:08 AM', '2007-01-02 5:55:59 AM' union all
select '2007-01-03 4:34:12 AM', '2007-01-03 4:55:18 AM' union all
select '2007-01-07 3:12:23 AM', '2007-01-07 3:52:25 AM'

(with apologies to http://www.sqlteam.com/article/working-with-time-spans-and-durations-in-sql-server for harvesting their base sql)

I am trying to find the count of Events that occurred in an hour, so the result set would look like this:

2007-01-01      12:00     3
2007-01-02       5:00     2
2007-01-03       4:00     1
2007-01-07       3:00     1

I have been playing with dateadd and round and grouping but not getting it. Can anyone help?

Thanks.

rounding datetime sql-server
4 Answers

You can also achieve this by using following SQL with date and hour in same columns and proper date time format and ordered by date time

SELECT  dateadd(hour, datediff(hour, 0, StartDate), 0) as 'ForDate', 
    COUNT(*) as 'Count' 
FROM #Events
GROUP BY dateadd(hour, datediff(hour, 0, LogTime), 0)
ORDER BY ForDate
user_30491750
Related