Group table into 15 minute intervals
Solution 1
;with cte_max as
(
select dateadd(mi, -15, max(StatusEndDateTime)) as EndTime, min(StatusSetDateTime) as StartTime
from AgentActivityLog
), times as
(
select StartTime as Time from cte_max
union all
select dateadd(mi, 15, c.Time)
from times as c
cross join cte_max as cm
where c.Time <= cm.EndTime
)
select
t.Time, A.UserID, A.Status,
case
when t.Time = A.StatusEndDateTime then 0
else A.StatusDuration / (count(*) over (partition by A.StatusSetDateTime, A.UserID, A.Status) - 1)
end as Duration
from AgentActivityLog as A
left outer join times as t on t.Time >= A.StatusSetDateTime and t.Time <= A.StatusEndDateTime
Solution 2
I've never been comfortable with using date math to split things up into partitions. It seems like there are all kinds of pitfalls to fall into.
What I prefer to do is to create a table (pre-defined, table-valued function, table variable) where there's one row for each date partition range. The table-valued function approach is particularly useful because you can build it for arbitrary ranges and partition sizes as you need. Then, you can join to this table to split things out.
paritionid starttime endtime
---------- ------------- -------------
1 8/1/2012 5:00 8/1/2012 5:15
2 8/1/2012 5:15 8/1/2012 5:30
...
I can't speak to the performance of this method, but I find the queries are much more intuitive.
Solution 3
It is relatively simple if you have a helper table with every 15-minute timestamp, which you JOIN to your base table via BETWEEN. You can build the helper table on the fly or keep it permanently in your database. Simple for the next guy at your company to figure out too:
// declare a table and a timestamp variable
declare @timetbl table(t datetime)
declare @t datetime
// set the first timestamp
set @t = '2012-01-01 00:00:00'
// set the last timestamp, can easily be extended to cover many years
while @t <= '2013-01-01'
begin
// populate the table with a new row, every 15 minutes
insert into @timetbl values (@t)
set @t = dateadd(mi, 15, @t)
end
// now the Select query:
select
tt.t, aal.UserID, aal.Status,
case when aal.StatusEndDateTime <= tt.t then 0 else 900 end as Duration
// using a shortcut for Duration, based on your comment that Start/End are always on the quarter-hour, and thus always 900 seconds or zero
from
@timetbl tt
INNER JOIN AgentActivityLog aal
on tt.t between aal.StatusSetDateTime and aal.StatusEndDateTime
order by
aal.UserID, tt.t
Wjdavis5
By Day: Senior Developer @ Synovia Solutions LLC. By Night: Probably still Senior Developer @ Synovia Solutions LLC. If not, enjoying good food, wine and maybe playing xbox. Weekend: Warrior
Updated on June 20, 2022Comments
-
Wjdavis5 almost 2 years
T-SQL, SQL Server 2008 and up
Given a sample table of
StatusSetDateTime | UserID | Status | StatusEndDateTime | StatusDuration(in seconds) ============================================================================ 2012-01-01 12:00:00 | myID | Available | 2012-01-01 13:00:00 | 3600
I need to break that down into a view that uses 15 minute intervals for example:
IntervalStart | UserID | Status | Duration =========================================== 2012-01-01 12:00:00 | myID | Available | 900 2012-01-01 12:15:00 | myID | Available | 900 2012-01-01 12:30:00 | myID | Available | 900 2012-01-01 12:45:00 | myID | Available | 900 2012-01-01 13:00:00 | myID | Available | 0 etc....
Now I've been able to search around and find some queries that will break down I found something similar for MySql Here :
And something for T-SQL Here
But on the second example they are summing the results whereas I need to divide the total duration by the interval time (900 seconds) by user by status.
I was able to adapt the examples in the second link to split everything into intervals but the total duration time is returned and I cannot quite figure out how to get the Interval durations to split (and still sum up to the total original duration).
Thanks in advance for any insight!
edit : First Attempt
;with cte as (select MIN(StatusDateTime) as MinDate , MAX(StatusDateTime) as MaxDate , convert(varchar(14),StatusDateTime, 120) as StartDate , DATEPART(minute, StatusDateTime) /15 as GroupID , UserID , StatusKey , avg(StateDuration) as AvgAmount from AgentActivityLog group by convert(varchar(14),StatusDateTime, 120) , DATEPART(minute, StatusDateTime) /15 , Userid,StatusKey) select dateadd(minute, 15*GroupID, CONVERT(datetime,StartDate+'00')) as [Start Date] , UserID, StatusKey, AvgAmount as [Average Amount] from cte
edit : Second Attempt
;With cte As (Select DateAdd(minute , 15 * (DateDiff(minute, '20000101', StatusDateTime) / 15) , '20000101') As StatusDateTime , userid, statuskey, StateDuration From AgentActivityLog) Select StatusDateTime, userid,statuskey,Avg(StateDuration) From cte Group By StatusDateTime,userid,statuskey;