Insert Dates in the return from a query where there is none

select datepart(Year, dev_time) as Year,
    datepart(Month, dev_time) as Month,
    datepart(Day, dev_time) as Day,
    datepart(Hour, dev_time) as Hour,
    count(tdm_msg) as Total_ACTIVITES
from TCKT_ACT
where tdm_msg = ‘4162′ and dev_time >= DATEADD(day, - 1, GETDATE())
group by datepart(Year, dev_time) ,
    datepart(Month, dev_time) ,
    datepart(Day, dev_time),
    datepart(Hour, dev_time)
order by datepart(Year, dev_time) asc,
    datepart(Month, dev_time) asc,
    datepart(Day, dev_time) asc,
    datepart(Hour, dev_time) asc

DECLARE @MinDate DATETIME;
SET @MinDate =  CONVERT(varchar, GETDATE(), 101);

WITH times AS (
    SELECT @MinDate as dt, 1 as depth
    UNION ALL
    SELECT DATEADD(hh, depth, @MinDate), 1 + depth as depth
    FROM times
    WHERE DATEADD(hh, depth, @MinDate) <= GETDATE())
SELECT DATEPART(YEAR, t.dt) as [Year],
    DATEPART(MONTH, t.dt) as [Month],
    DATEPART(DAY, t.dt) as [Day],
    DATEPART(HOUR, t.dt) as [Hour],
    COUNT(tdm_msg) as Total_ACTIVITES
FROM times t
LEFT JOIN (SELECT * FROM TCKT_ACT WHERE tdm_msg = '4162' and dev_time >= @MinDate) a
    ON  DATEPART(HOUR, t.dt)  = DATEPART(HOUR, a.dev_time)
    AND MONTH(t.dt) = MONTH(a.dev_time)
    AND DAY(t.dt)   = DAY(a.dev_time)
    AND YEAR(t.dt)  = YEAR(a.dev_time)
GROUP BY DATEPART(YEAR, t.dt) ,
    DATEPART(MONTH, t.dt) ,
    DATEPART(DAY, t.dt),
    DATEPART(HOUR, t.dt)
ORDER BY DATEPART(YEAR, t.dt) asc,
    DATEPART(MONTH, t.dt) asc,
    DATEPART(DAY, t.dt) asc,
    DATEPART(HOUR, t.dt) asc
OPTION (MAXRECURSION 0); /* Just in case you want a longer timespan later on... */

if exists (select * from dbo.sysobjects where name = 'fn_daterange') drop function fn_daterange;
go

create function fn_daterange
   (
   @MinDate as datetime,
   @MaxDate as datetime,
   @intval  as datetime
   )
returns table
--**************************************************************************
-- Procedure: fn_daterange()
--    Author: Ron Savage
--      Date: 12/16/2008
--
-- Description:
-- This function takes a starting and ending date and an interval, then
-- returns a table of all the dates in that range at the specified interval.
--
-- Change History:
-- Date        Init. Description
-- 12/16/2008  RS    Created.
-- **************************************************************************
as
return
   WITH times (startdate, enddate, intervl) AS
      (
      SELECT @MinDate as startdate, @MinDate + @intval - .0000001 as enddate, @intval as intervl
         UNION ALL
      SELECT startdate + intervl as startdate, enddate + intervl as enddate, intervl as intervl
      FROM times
      WHERE startdate + intervl <= @MaxDate
      )
   select startdate, enddate from times;

go

startdate               enddate                 intervl
----------------------- ----------------------- -----------------------
2008-12-14 10:00:00.000 2008-12-14 10:59:59.997 1900-01-01 01:00:00.000
2008-12-14 11:00:00.000 2008-12-14 11:59:59.997 1900-01-01 01:00:00.000
2008-12-14 12:00:00.000 2008-12-14 12:59:59.997 1900-01-01 01:00:00.000
2008-12-14 13:00:00.000 2008-12-14 13:59:59.997 1900-01-01 01:00:00.000
2008-12-14 14:00:00.000 2008-12-14 14:59:59.997 1900-01-01 01:00:00.000
2008-12-14 15:00:00.000 2008-12-14 15:59:59.997 1900-01-01 01:00:00.000
2008-12-14 16:00:00.000 2008-12-14 16:59:59.997 1900-01-01 01:00:00.000
2008-12-14 17:00:00.000 2008-12-14 17:59:59.997 1900-01-01 01:00:00.000
2008-12-14 18:00:00.000 2008-12-14 18:59:59.997 1900-01-01 01:00:00.000
2008-12-14 19:00:00.000 2008-12-14 19:59:59.997 1900-01-01 01:00:00.000
2008-12-14 20:00:00.000 2008-12-14 20:59:59.997 1900-01-01 01:00:00.000

eventdate               eventnote
    ----------------------- --------------------
    2008-12-14 10:01:00.000 oo! an event!
    2008-12-14 10:01:00.000 oo! an event!
    2008-12-14 10:01:00.000 oo! an event!
    2008-12-14 10:01:00.000 oo! an event!
    2008-12-14 10:23:00.000 oo! an event!
    2008-12-14 10:23:00.000 oo! an event!
    2008-12-14 10:23:00.000 oo! an event!
    2008-12-14 11:23:00.000 oo! an event!
    2008-12-14 11:23:00.000 oo! an event!
    2008-12-14 11:23:00.000 oo! an event!
    2008-12-14 11:23:00.000 oo! an event!
    2008-12-14 11:23:00.000 oo! an event!
    2008-12-14 14:23:00.000 oo! an event!
    2008-12-14 14:23:00.000 oo! an event!
    2008-12-14 14:23:00.000 oo! an event!
    2008-12-14 19:23:00.000 oo! an event!
    2008-12-14 19:23:00.000 oo! an event!
    2008-12-14 19:23:00.000 oo! an event!
    2008-12-14 19:23:00.000 oo! an event!
    2008-12-14 19:00:00.000 oo! an event!
    2008-12-14 19:00:00.000 oo! an event!
    2008-12-14 19:00:00.000 oo! an event!

    22 Row(s) affected

select
   dr.startdate,
   dr.enddate,
   count(me.eventdate) as eventcount
from
   fn_daterange('12/14/2008 10:00:00', '12/14/2008 20:00:00', '01:00:00' ) dr

   LEFT OUTER JOIN myevents me
      on ( me.eventdate between dr.startdate and dr.enddate)
group by
   dr.startdate,
   dr.enddate


startdate               enddate                 eventcount
----------------------- ----------------------- ----------
2008-12-14 10:00:00.000 2008-12-14 10:59:59.993 7
2008-12-14 11:00:00.000 2008-12-14 11:59:59.993 5
2008-12-14 12:00:00.000 2008-12-14 12:59:59.993 0
2008-12-14 13:00:00.000 2008-12-14 13:59:59.993 0
2008-12-14 14:00:00.000 2008-12-14 14:59:59.993 3
2008-12-14 15:00:00.000 2008-12-14 15:59:59.993 0
2008-12-14 16:00:00.000 2008-12-14 16:59:59.993 0
2008-12-14 17:00:00.000 2008-12-14 17:59:59.993 0
2008-12-14 18:00:00.000 2008-12-14 18:59:59.993 0
2008-12-14 19:00:00.000 2008-12-14 19:59:59.993 7
2008-12-14 20:00:00.000 2008-12-14 20:59:59.993 0

11 Row(s) affected