RE: I need help with a query to count how many sessions are active and remain active per hour.

SSC Guru

Points: 86908

January 25, 2015 at 6:22 pm

IBG does have some great articles on intervals for sure, but I don't think anything particularly fancy is needed here.

WITH SampleData (OpDate, sessionStartTime, sessionCloseTime) AS

(

SELECT CAST('2015-01-20' AS DATE), CAST('2015-01-20 14:32:59.130' AS DATETIME), CAST('2015-01-20 14:33:14.6299166' AS DATETIME2)

UNION ALL SELECT '2015-01-20','2015-01-20 06:58:33.730','2015-01-20 15:27:16.9133442'

UNION ALL SELECT '2015-01-20','2015-01-20 09:56:22.840','2015-01-20 17:56:29.7555853'

UNION ALL SELECT '2015-01-20','2015-01-20 05:59:18.613','2015-01-20 14:05:19.0426707'

UNION ALL SELECT '2015-01-20','2015-01-20 06:03:45.970','2015-01-20 14:17:34.9328702'

UNION ALL SELECT '2015-01-20','2015-01-20 12:37:39.597','2015-01-20 12:37:55.7542296'

UNION ALL SELECT '2015-01-20','2015-01-20 13:28:46.980','2015-01-20 21:44:29.7902115'

UNION ALL SELECT '2015-01-20','2015-01-20 04:52:59.443','2015-01-20 12:45:04.1644632'

UNION ALL SELECT '2015-01-20','2015-01-20 05:59:29.227','2015-01-20 14:08:14.9452666'

UNION ALL SELECT '2015-01-20','2015-01-20 06:16:13.943','2015-01-20 13:55:09.7511570'

UNION ALL SELECT '2015-01-20','2015-01-20 07:02:33.433','2015-01-20 13:54:29.7691216'

UNION ALL SELECT '2015-01-20','2015-01-20 12:56:14.437','2015-01-20 21:47:32.2838659'

UNION ALL SELECT '2015-01-20','2015-01-20 13:56:17.973','2015-01-20 21:36:04.6284206'

UNION ALL SELECT '2015-01-20','2015-01-20 14:12:55.620','2015-01-20 21:37:46.8277100'

UNION ALL SELECT '2015-01-21','2015-01-20 19:00:10.370','2015-01-20 19:01:18.5469985'

UNION ALL SELECT '2015-01-20','2015-01-20 06:05:14.290','2015-01-20 14:26:38.7769319'

UNION ALL SELECT '2015-01-20','2015-01-20 07:54:20.703','2015-01-20 14:58:53.4825405'

UNION ALL SELECT '2015-01-20','2015-01-20 10:37:50.410','2015-01-20 21:06:19.5611850'

UNION ALL SELECT '2015-01-20','2015-01-20 10:43:14.437','2015-01-20 19:20:27.1715458'

UNION ALL SELECT '2015-01-20','2015-01-20 10:57:24.600','2015-01-20 17:07:39.9467432'

UNION ALL SELECT '2015-01-20','2015-01-20 11:42:34.937','2015-01-20 11:43:11.1604422'

UNION ALL SELECT '2015-01-20','2015-01-20 13:06:42.877','2015-01-20 14:05:20.2009713'

UNION ALL SELECT '2015-01-20','2015-01-20 13:38:31.790','2015-01-20 21:54:53.7340106'

UNION ALL SELECT '2015-01-20','2015-01-20 13:59:46.227','2015-01-20 21:26:51.6078367'

UNION ALL SELECT '2015-01-20','2015-01-20 14:59:26.897','2015-01-20 14:59:39.4799102'

UNION ALL SELECT '2015-01-20','2015-01-20 16:12:10.877','2015-01-20 16:12:23.8861160'

UNION ALL SELECT '2015-01-21','2015-01-20 20:01:56.263','2015-01-20 20:02:16.8894884'

UNION ALL SELECT '2015-01-21','2015-01-20 21:39:15.557','2015-01-21 06:01:43.1597490'

UNION ALL SELECT '2015-01-20','2015-01-20 13:44:21.840','2015-01-20 21:23:34.8060943'

UNION ALL SELECT '2015-01-21','2015-01-20 21:30:40.497','2015-01-21 08:42:06.9555833'

UNION ALL SELECT '2015-01-20','2015-01-20 06:04:02.777','2015-01-20 14:10:13.8869506'

UNION ALL SELECT '2015-01-20','2015-01-20 08:06:31.463','2015-01-20 08:06:53.6402892'

UNION ALL SELECT '2015-01-20','2015-01-20 14:49:58.047','2015-01-20 21:48:11.5114277'

UNION ALL SELECT '2015-01-21','2015-01-20 19:31:48.897','2015-01-20 19:32:07.2625646'

UNION ALL SELECT '2015-01-20','2015-01-20 05:44:33.593','2015-01-20 21:36:26.3447710'

UNION ALL SELECT '2015-01-20','2015-01-20 06:55:43.970','2015-01-20 15:00:32.9154499'

UNION ALL SELECT '2015-01-20','2015-01-20 06:58:56.967','2015-01-20 15:22:41.4673167'

UNION ALL SELECT '2015-01-20','2015-01-20 07:07:43.833','2015-01-20 13:57:25.9191146'

UNION ALL SELECT '2015-01-20','2015-01-20 07:17:18.270','2015-01-20 13:31:14.2577403'

UNION ALL SELECT '2015-01-20','2015-01-20 09:57:17.407','2015-01-20 17:54:02.5617463'

UNION ALL SELECT '2015-01-20','2015-01-20 12:56:36.103','2015-01-20 20:56:28.3974009'

UNION ALL SELECT '2015-01-20','2015-01-20 13:26:53.700','2015-01-20 21:47:04.8738773'

UNION ALL SELECT '2015-01-20','2015-01-20 06:57:41.310','2015-01-20 14:57:43.9601427'

UNION ALL SELECT '2015-01-20','2015-01-20 07:00:50.387','2015-01-20 15:03:41.5787814'

UNION ALL SELECT '2015-01-20','2015-01-20 07:01:17.280','2015-01-20 11:55:54.6993909'

UNION ALL SELECT '2015-01-20','2015-01-20 07:03:49.287','2015-01-20 15:47:41.8889618'

UNION ALL SELECT '2015-01-20','2015-01-20 10:06:23.760','2015-01-20 15:20:45.3993880'

UNION ALL SELECT '2015-01-20','2015-01-20 10:57:21.940','2015-01-20 19:34:25.1427994'

UNION ALL SELECT '2015-01-20','2015-01-20 12:55:23.397','2015-01-20 20:37:22.7280870'

UNION ALL SELECT '2015-01-20','2015-01-20 13:56:25.737','2015-01-20 21:24:40.6800604'

UNION ALL SELECT '2015-01-20','2015-01-20 16:11:44.153','2015-01-20 16:11:58.2644405'

UNION ALL SELECT '2015-01-20','2015-01-20 17:09:10.527','2015-01-20 17:09:42.2642180'

UNION ALL SELECT '2015-01-20','2015-01-20 18:26:57.937','2015-01-20 18:27:18.8651814'

UNION ALL SELECT '2015-01-21','2015-01-20 20:25:08.367','2015-01-20 20:26:53.4870852'

UNION ALL SELECT '2015-01-20','2015-01-20 14:14:18.947','2015-01-20 21:14:39.5385291'

UNION ALL SELECT '2015-01-20','2015-01-20 08:43:30.967','2015-01-20 17:22:39.7275009'

UNION ALL SELECT '2015-01-20','2015-01-20 13:27:51.600','2015-01-20 21:37:31.0845613'

UNION ALL SELECT '2015-01-20','2015-01-20 11:52:10.520','2015-01-20 11:52:31.3193575'

UNION ALL SELECT '2015-01-20','2015-01-20 13:55:13.653','2015-01-20 21:42:16.3716312'

UNION ALL SELECT '2015-01-20','2015-01-20 15:27:24.240','2015-01-20 21:15:55.7206423'

UNION ALL SELECT '2015-01-21','2015-01-20 21:29:02.013','2015-01-21 06:13:54.3112466'

UNION ALL SELECT '2015-01-20','2015-01-20 05:37:20.657','2015-01-20 14:02:59.0021339'

UNION ALL SELECT '2015-01-20','2015-01-20 05:59:02.227','2015-01-20 14:51:08.9077080'

UNION ALL SELECT '2015-01-20','2015-01-20 06:02:41.477','2015-01-20 14:06:42.3786345'

UNION ALL SELECT '2015-01-20','2015-01-20 06:06:58.307','2015-01-20 14:12:42.5994001'

UNION ALL SELECT '2015-01-20','2015-01-20 06:19:32.823','2015-01-20 11:47:49.6103998'

UNION ALL SELECT '2015-01-20','2015-01-20 14:03:43.747','2015-01-20 21:11:56.3315989'

UNION ALL SELECT '2015-01-20','2015-01-20 14:05:17.853','2015-01-20 21:44:57.8803795'

UNION ALL SELECT '2015-01-20','2015-01-20 14:13:44.330','2015-01-20 21:34:06.3004142'

UNION ALL SELECT '2015-01-20','2015-01-20 05:36:49.540','2015-01-20 13:38:58.0820089'

UNION ALL SELECT '2015-01-20','2015-01-20 05:58:37.797','2015-01-20 14:20:32.0060283'

UNION ALL SELECT '2015-01-20','2015-01-20 06:58:09.170','2015-01-20 14:56:55.4300087'

UNION ALL SELECT '2015-01-20','2015-01-20 06:58:35.357','2015-01-20 17:06:23.5524613'

UNION ALL SELECT '2015-01-20','2015-01-20 10:58:17.380','2015-01-20 19:39:53.3562629'

UNION ALL SELECT '2015-01-20','2015-01-20 11:07:59.513','2015-01-20 20:01:38.7771990'

UNION ALL SELECT '2015-01-20','2015-01-20 11:42:38.660','2015-01-20 14:08:18.1047026'

UNION ALL SELECT '2015-01-20','2015-01-20 11:46:56.993','2015-01-20 19:43:32.5519692'

UNION ALL SELECT '2015-01-20','2015-01-20 13:30:17.947','2015-01-20 21:47:14.4841045'

UNION ALL SELECT '2015-01-20','2015-01-20 14:04:38.660','2015-01-20 21:01:00.9489002'

UNION ALL SELECT '2015-01-20','2015-01-20 17:24:50.310','2015-01-20 17:25:07.2505869'

UNION ALL SELECT '2015-01-21','2015-01-20 19:50:36.947','2015-01-20 19:50:45.2724562'

UNION ALL SELECT '2015-01-21','2015-01-20 21:26:01.717','2015-01-20 21:26:27.3945685'

UNION ALL SELECT '2015-01-20','2015-01-20 14:02:20.307','2015-01-20 21:26:10.4938165'

UNION ALL SELECT '2015-01-21','2015-01-20 20:41:23.310','2015-01-20 21:24:48.2849439'

UNION ALL SELECT '2015-01-20','2015-01-20 07:02:59.580','2015-01-20 15:03:09.4201222'

UNION ALL SELECT '2015-01-20','2015-01-20 12:33:22.637','2015-01-20 12:33:41.6719856'

UNION ALL SELECT '2015-01-20','2015-01-20 13:36:55.920','2015-01-20 21:44:03.1902854'

UNION ALL SELECT '2015-01-20','2015-01-20 13:56:35.357','2015-01-20 21:41:12.1944898'

UNION ALL SELECT '2015-01-20','2015-01-20 05:40:09.910','2015-01-20 11:49:40.0552588'

UNION ALL SELECT '2015-01-20','2015-01-20 09:03:07.633','2015-01-20 16:32:02.2312852'

UNION ALL SELECT '2015-01-20','2015-01-20 11:52:25.347','2015-01-20 19:29:38.2940908'

UNION ALL SELECT '2015-01-20','2015-01-20 13:29:37.610','2015-01-20 21:50:00.3525520'

UNION ALL SELECT '2015-01-20','2015-01-20 14:10:34.137','2015-01-20 21:50:39.9676604'

UNION ALL SELECT '2015-01-21','2015-01-20 21:30:10.333','2015-01-21 08:02:04.5393614'

UNION ALL SELECT '2015-01-21','2015-01-20 21:33:08.983','2015-01-21 08:01:40.3326150'

UNION ALL SELECT '2015-01-21','2015-01-20 21:54:49.967','2015-01-20 21:55:15.5970207'

UNION ALL SELECT '2015-01-20','2015-01-20 06:08:04.570','2015-01-20 14:20:54.2859274'

UNION ALL SELECT '2015-01-20','2015-01-20 06:10:37.890','2015-01-20 11:41:42.2219588'

UNION ALL SELECT '2015-01-20','2015-01-20 10:57:40.863','2015-01-20 19:24:13.7005142'

UNION ALL SELECT '2015-01-20','2015-01-20 11:02:09.100','2015-01-20 20:55:54.2942428'

UNION ALL SELECT '2015-01-20','2015-01-20 11:38:20.480','2015-01-20 19:12:26.6052552'

UNION ALL SELECT '2015-01-20','2015-01-20 12:29:56.523','2015-01-20 19:28:31.8472082'

UNION ALL SELECT '2015-01-20','2015-01-20 12:31:29.697','2015-01-20 12:31:44.1097679'

UNION ALL SELECT '2015-01-20','2015-01-20 13:27:54.430','2015-01-20 21:52:53.5069305'

UNION ALL SELECT '2015-01-20','2015-01-20 14:00:07.647','2015-01-20 21:57:33.2832468'

UNION ALL SELECT '2015-01-20','2015-01-20 14:01:39.907','2015-01-20 21:29:07.3326878'

UNION ALL SELECT '2015-01-20','2015-01-20 14:03:06.057','2015-01-20 21:18:21.9986703'

UNION ALL SELECT '2015-01-20','2015-01-20 14:58:59.073','2015-01-20 14:59:12.7897409'

UNION ALL SELECT '2015-01-20','2015-01-20 17:08:45.317','2015-01-20 17:08:57.1577934'

),

DatesInData AS

(

SELECT OpDate

FROM SampleData

GROUP BY OpDate

),

HoursOfTheDay AS

(

SELECT h=DATEADD(hour, a.h-1, CAST(b.OpDate AS DATETIME))

FROM (VALUES(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15),(16),(17),(18),(19),(20),(21),(22),(23),(24)) a (h)

CROSS JOIN DatesInData b

)

SELECT h

,Logins=

(

SELECT COUNT(*)

FROM SampleData

WHERE h=DATEADD(hour, DATEDIFF(hour, 0, sessionStartTime), 0)

)

,Active=

(

SELECT COUNT(*)

FROM SampleData

WHERE h BETWEEN sessionStartTime AND sessionCloseTime

)

FROM HoursOfTheDay;

My mantra: No loops! No CURSORs! No RBAR! Hoo-uh![/I]
My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.

Need to UNPIVOT? Why not CROSS APPLY VALUES instead?[/url]
Since random numbers are too important to be left to chance, let's generate some![/url]
Learn to understand recursive CTEs by example.[/url]
[url url=http://www.sqlservercentral.com/articles/St