sql server - SQL TSQL for Workers per Hour -

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i have log fingerprint timestamps follows:

usr   timestamp -------------------------  1    2015-07-01 08:01:00  2    2015-07-01 08:05:00  3    2015-07-01 08:07:00  1    2015-07-01 10:05:00  3    2015-07-01 11:00:00  1    2015-07-01 12:01:00  2    2015-07-01 13:03:00  2    2015-07-01 14:02:00  1    2015-07-01 16:03:00  2    2015-07-01 18:04:00

and wish output of workers per hour (rounding nearest hour) theoretical output should be:

 7:00  0  8:00  3  9:00  3  10:00 2  11:00 1  12:00 2  13:00 1  14:00 2  15:00 2  16:00 1  17:00 1  18:00 0  19:00 0

can think on how approach sql or if no other way, through tsql?

edit: timestamps logins , logouts of different users. @ 8am 3 users logged in , same 3 still working @ 9am. 1 of them leaves @ 10am. etc

to start can use datepart hours days following , use group user 

select datepart(hour, getdate());

sql fiddle

select convert(varchar(5),datepart(hour, timestamp)) + ':00' time, count(usr) users tbl group datepart(hour, timestamp)

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