Grouping by date hour with "buckets"

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Grouping by date hour with "buckets"

magsdtev

Valued Member

Points: 62

February 2, 2017 at 12:45 pm

#326548

Running SQL 2008
Table structure below

CREATE TABLE [dbo].[ICA](

[MsgDateTime] [datetime] NULL,

[UserName] [varchar](255) NULL,

[Application] [varchar](255) NULL,

[StartTime] [datetime] NULL,

[EndTime] [varchar](255) NULL,

[Duration] [varchar](255) NULL,

[ConnectionID] [varchar](255) NULL

) ON [PRIMARY]

I am trying to get the Count of users in 60 minute intervals by Date based off the amount of minutes / hours in the duration field like below
MSGDateTime Interval Users
2017-02-01          60         130
2017-02-01          120       200
2017-02-01         180        4000

here is an extract of the data that is in the db now

MsgDateTime	UserName	Application	StartTime	EndTime	Duration	ConnectionID
12/22/16 14:34	jshmo	NA	12/22/16 18:51	12/22/2016 19:35	0:44:04	1e87569
12/22/16 14:34	juser	NA	12/22/16 19:35	12/22/2016 19:36	0:00:23	1a1e463
12/22/16 16:14	echeek	NA	12/22/16 12:55	12/22/2016 21:15	8:20:20	19f101e
12/22/16 16:14	dbaker	NA	12/22/16 18:08	12/22/2016 21:16	3:08:15	1e8178a
12/22/16 16:18	hdev	NA	12/22/16 20:08	12/22/2016 21:21	1:12:40	14b8e6a
12/22/16 16:20	alone	NA	12/22/16 21:14	12/22/2016 21:21	0:06:59	1e9ae81
12/22/16 16:26	yelni	NA	12/22/16 21:22	12/22/2016 21:26	0:04:11	146fb6e
12/22/16 16:27	oco	NA	12/22/16 20:17	12/22/2016 21:29	1:11:43	1a22f8b
12/22/16 16:28	lkey	NA	12/22/16 20:49	12/22/2016 21:28	0:38:03	146c6c0
12/22/16 16:28	jfk	NA	12/22/16 20:05	12/22/2016 21:28	1:22:50	1467dce
12/22/16 16:19	sdailey	NA	12/22/16 21:04	12/22/2016 21:19	0:14:40	146de84
12/22/16 16:19	vene	NA	12/22/16 21:15	12/22/2016 21:19	0:03:45	146f08c

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Lowell SSC Guru Points: 323504 More actions · Answer 1

helpful consumable format, still working on the solution:
IF OBJECT_ID('tempdb.[dbo].[#ICA]') IS NOT NULL DROP TABLE [dbo].[#ICA] GO CREATE TABLE [dbo].[#ICA] ( [MsgDateTime] DATETIME NULL, [UserName] VARCHAR(255) NULL, [Application] VARCHAR(255) NULL, [StartTime] DATETIME NULL, [EndTime] VARCHAR(255) NULL, [Duration] VARCHAR(255) NULL, [ConnectionID] VARCHAR(255) NULL)

INSERT INTO [#ICA] SELECT '12/22/16 14:34','jshmo','NA','12/22/16 18:51','12/22/2016 19:35','0:44:04','1e87569' UNION ALL SELECT '12/22/16 14:34','juser','NA','12/22/16 19:35','12/22/2016 19:36','0:00:23','1a1e463' UNION ALL SELECT '12/22/16 16:14','echeek','NA','12/22/16 12:55','12/22/2016 21:15','8:20:20','19f101e' UNION ALL SELECT '12/22/16 16:14','dbaker','NA','12/22/16 18:08','12/22/2016 21:16','3:08:15','1e8178a' UNION ALL SELECT '12/22/16 16:18','hdev','NA','12/22/16 20:08','12/22/2016 21:21','1:12:40','14b8e6a' UNION ALL SELECT '12/22/16 16:20','alone','NA','12/22/16 21:14','12/22/2016 21:21','0:06:59','1e9ae81' UNION ALL SELECT '12/22/16 16:26','yelni','NA','12/22/16 21:22','12/22/2016 21:26','0:04:11','146fb6e' UNION ALL SELECT '12/22/16 16:27','oco','NA','12/22/16 20:17','12/22/2016 21:29','1:11:43','1a22f8b' UNION ALL SELECT '12/22/16 16:28','lkey','NA','12/22/16 20:49','12/22/2016 21:28','0:38:03','146c6c0' UNION ALL SELECT '12/22/16 16:28','jfk','NA','12/22/16 20:05','12/22/2016 21:28','1:22:50','1467dce' UNION ALL SELECT '12/22/16 16:19','sdailey','NA','12/22/16 21:04','12/22/2016 21:19','0:14:40','146de84' UNION ALL SELECT '12/22/16 16:19','vene','NA','12/22/16 21:15','12/22/2016 21:19','0:03:45','146f08c'

Lowell

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Joe Torre SSChampion Points: 10248 More actions · Answer 2

Try something like:

SELECT
      CASE
         WHEN i.Duration BETWEEN '0:00:00' AND '1:00:00' THEN '0-60'
         ELSE
         CASE
            WHEN i.Duration BETWEEN '1:00:01' AND '2:00:00' THEN '60-120'
            ELSE
               CASE
                  WHEN i.Duration BETWEEN '2:00:01' AND '3:00:00' THEN '120-180'
                  ELSE '>180'
               END
         END
      END   Buckets
    , Count(*) [Count]
FROM #ICA i
GROUP BY CASE
         WHEN i.Duration BETWEEN '0:00:00' AND '1:00:00' THEN '0-60'
         ELSE
         CASE
            WHEN i.Duration BETWEEN '1:00:01' AND '2:00:00' THEN '60-120'
            ELSE
               CASE
                  WHEN i.Duration BETWEEN '2:00:01' AND '3:00:00' THEN '120-180'
                  ELSE '>180'
               END
         END
      END;
DROP TABLE #ICA;
GO

drew.allen SSC Guru Points: 76945 More actions · Answer 3

Joe Torre - Thursday, February 2, 2017 1:19 PM
Try something like:
SELECT
      CASE
         WHEN i.Duration BETWEEN '0:00:00' AND '1:00:00' THEN '0-60'
         ELSE
         CASE
            WHEN i.Duration BETWEEN '1:00:01' AND '2:00:00' THEN '60-120'
            ELSE
               CASE
                  WHEN i.Duration BETWEEN '2:00:01' AND '3:00:00' THEN '120-180'
                  ELSE '>180'
               END
         END
      END   Buckets
    , Count(*) [Count]
FROM #ICA i
GROUP BY CASE
         WHEN i.Duration BETWEEN '0:00:00' AND '1:00:00' THEN '0-60'
         ELSE
         CASE
            WHEN i.Duration BETWEEN '1:00:01' AND '2:00:00' THEN '60-120'
            ELSE
               CASE
                  WHEN i.Duration BETWEEN '2:00:01' AND '3:00:00' THEN '120-180'
                  ELSE '>180'
               END
         END
      END;
DROP TABLE #ICA;
GO

The problem with this approach is that you may have missed a CASE as in the 8:20:20 duration. Using Lowell's setup, I came up with the following.

SELECT 60 * (DATEDIFF(HOUR, '00:00', i.Duration) + 1), COUNT(DISTINCT i.UserName) FROM #ICA i GROUP BY DATEDIFF(HOUR, '00:00', i.Duration)

Drew

J. Drew Allen
Business Intelligence Analyst
Philadelphia, PA

Joe Torre SSChampion Points: 10248 More actions · Answer 4

Joe Torre

SSChampion

Points: 10248

February 2, 2017 at 2:38 pm

#1926491

Your approach much better.

magsdtev Valued Member Points: 62 More actions · Answer 5

So I tried the below

SELECT 60 * (DATEDIFF(HOUR, '00:00', i.Duration) + 1), COUNT(DISTINCT i.UserName)

FROM #ICA i

GROUP BY DATEDIFF(HOUR, '00:00', i.Duration)

and I got this error

Msg 241, Level 16, State 1, Line 1

Conversion failed when converting date and/or time from character string.

magsdtev Valued Member Points: 62 More actions · Answer 6

Joe
I tried yours and that seems to work, I have about 18 months of data in this database, how do I get the buckets by day instead of an aggregate of all of them?

drew.allen SSC Guru Points: 76945 More actions · Answer 7

magsdtev - Thursday, February 2, 2017 3:33 PM
So I tried the below
SELECT 60 * (DATEDIFF(HOUR, '00:00', i.Duration) + 1), COUNT(DISTINCT i.UserName)
FROM #ICA i
GROUP BY DATEDIFF(HOUR, '00:00', i.Duration)
and I got this error
Msg 241, Level 16, State 1, Line 1
Conversion failed when converting date and/or time from character string.

This indicates that you probably have some bad data. You can find this by the following.

SELECT * FROM #ICA WHERE TRY_CAST(Duration AS TIME) IS NULL

This is one of the hazards of not using the correct data type.

See if you can figure out for yourself how to add a bucket for each day. You learn much better when you try things for yourself.

Drew

J. Drew Allen
Business Intelligence Analyst
Philadelphia, PA

magsdtev Valued Member Points: 62 More actions · Answer 8

I just realized that the duration field is a varchar not a time field. I can work around that with a datediff on the start and end times.
The buckets per day is really stumping me as I am really not sure how to even start that

Joe Torre SSChampion Points: 10248 More actions · Answer 9

I would create a calendar table with a granularity of day with a StartOfDay set to 12:00:00 AM of the day and a EndOfDay set to 23:90:59.997 (for datetime). With a left join from your table you can generate empty days as well.

magsdtev Valued Member Points: 62 More actions · Answer 10

Sorry for all of the Questions Joe as I am a bit new to doing this sort of thing.

What would that table look like
Month_Day Column
StartOf Day Colum
EndOf Day column

Joe Torre SSChampion Points: 10248 More actions · Answer 11

The answer is it depends on your requirements. Many organizations run a fiscal year from June to July so it might include fiscal Month column with start and end of accounting periods. Typically other dates of interest such as company holidays, pay periods, months, years....