jjswin
Reputation: 51
SQL max concurrent sessions per hour of day
I work in a healthcare call-centre environment. I have access to our core system's database and I want to use the data in it to determine the number of staff logged on each hour of the data in a given period that may expand over 24 hours (e.g. 24/12/2014 - 26/12/2014).
There is a userlog table that records when users log on and log off.
userlog table example
UserRef Date LogType SessionID
--------------------------------------- ----------------------- ------ -----------------------
96AD647C-D061-43F5-9F8D-FA6C74817E07 2002-10-17 14:11:25.763 LOGON 8D451569-0260-46BB-9B9E-F49B3E778161
96AD647C-D061-43F5-9F8D-FA6C74817E07 2002-10-17 18:11:32.547 LOGOFF 8D451569-0260-46BB-9B9E-F49B3E778161
60738820-5F72-4E20-A070-57E07C83B6DE 2002-10-17 14:53:31.153 LOGON C773894C-8B2D-4054-A550-3F04B4C5669F
60738820-5F72-4E20-A070-57E07C83B6DE 2002-10-17 22:55:25.607 LOGOFF C773894C-8B2D-4054-A550-3F04B4C5669F
90A55FDD-967E-4D99-96DF-96840CDB2CDF 2002-10-17 15:26:40.123 LOGON 1CE5F5A5-4E20-4D4A-BB67-EB0CB33976D7
96AD647C-D061-43F5-9F8D-FA6C74817E07 2002-10-17 15:51:28.590 LOGON 7EFDEE1C-15CF-4DE1-B59F-7AFC49B4BE73
90A55FDD-967E-4D99-96DF-96840CDB2CDF 2002-10-17 15:58:05.217 LOGOFF 1CE5F5A5-4E20-4D4A-BB67-EB0CB33976D7
96AD647C-D061-43F5-9F8D-FA6C74817E07 2002-10-17 15:58:31.013 LOGOFF 7EFDEE1C-15CF-4DE1-B59F-7AFC49B4BE73
90A55FDD-967E-4D99-96DF-96840CDB2CDF 2002-10-17 15:58:32.733 LOGON 03F56AB8-FED5-4CC7-8445-26BF55F58E60
90A55FDD-967E-4D99-96DF-96840CDB2CDF 2002-10-17 16:13:02.827 LOGOFF 03F56AB8-FED5-4CC7-8445-26BF55F58E60
Desired results (this is not intended to reflect the above sample data):
Date Hour Number of users logged in
---- ---- -------------------------
01/12/2014 0 0
01/12/2014 1 0
01/12/2014 2 0
01/12/2014 3 0
01/12/2014 4 0
01/12/2014 5 1
01/12/2014 6 1
01/12/2014 7 1
01/12/2014 8 3
01/12/2014 9 7
01/12/2014 10 7
...
01/12/2014 23 0
To be clear: I'm trying to get the hour to still display with a 0 count when there were no users logged in.
I guess what I'm looking for is the maximum concurrent sessions for each hour of the day, but I'm not overly technical or skilled in SQL (getting better bit by bit, though!) so I hope that terminology doesn't confuse things!
I've googled for this and found a few similar scenarios, but for Oracle and MySQL, or where the log table records the logon data differently. I'm sure I'll get to a point where I can successfully 'translate' other database query code to MS SQL, but I'm not there yet!
I am using: Microsoft SQL Server 2005 - 9.00.1399.06 (Intel X86).
Thanks in advance for your help.
Upvotes: 1
Views: 3371
Answers (2)
user2941651
Reputation:
UPDATED (v # 4):
I've added date filter at the end of the query - WHERE A.[Date] Between @X and @Y - it's not most efficient way in this case but simplest I think and less error prone for a start :
SELECT
A.[Date],
A.[Hour],
SUM(CASE WHEN (B.[SessionID] IS NULL) THEN 0 ELSE 1 END) AS [Number_of_Sessions_Per_Hour]
FROM
(
SELECT DISTINCT
CONVERT(DATETIME,
LTRIM(RTRIM(CONVERT(NVARCHAR(10), YEAR(userlog.[Date]))))
+ '-' + RIGHT('0' + LTRIM(RTRIM(CONVERT(NVARCHAR(10), MONTH(userlog.[Date])))), 2)
+ '-' + RIGHT('0' + LTRIM(RTRIM(CONVERT(NVARCHAR(10), DAY(userlog.[Date])))), 2)
, 120) AS [Date],
hours_table.[Hour]
FROM
userlog,
(
SELECT 1 AS [Hour] UNION ALL SELECT 3 AS [Hour] UNION ALL SELECT 4 AS [Hour] UNION ALL SELECT 5 AS [Hour] UNION ALL SELECT 6 AS [Hour]
UNION ALL SELECT 7 AS [Hour] UNION ALL SELECT 7 AS [Hour] UNION ALL SELECT 8 AS [Hour] UNION ALL SELECT 9 AS [Hour] UNION ALL SELECT 10 AS [Hour]
UNION ALL SELECT 11 AS [Hour] UNION ALL SELECT 12 AS [Hour] UNION ALL SELECT 13 AS [Hour] UNION ALL SELECT 14 AS [Hour] UNION ALL SELECT 15 AS [Hour]
UNION ALL SELECT 16 AS [Hour] UNION ALL SELECT 17 AS [Hour] UNION ALL SELECT 18 AS [Hour] UNION ALL SELECT 19 AS [Hour] UNION ALL SELECT 20 AS [Hour]
UNION ALL SELECT 21 AS [Hour] UNION ALL SELECT 22 AS [Hour] UNION ALL SELECT 23 AS [Hour] UNION ALL SELECT 24 AS [Hour]
) as hours_table
) AS A
LEFT OUTER JOIN
(
SELECT
userlog.SessionID,
MAX(CASE WHEN userlog.LogType = 'LOGON'
THEN CONVERT(DATETIME,
LTRIM(RTRIM(CONVERT(NVARCHAR(10), YEAR(userlog.[Date]))))
+ '-' + RIGHT('0' + LTRIM(RTRIM(CONVERT(NVARCHAR(10), MONTH(userlog.[Date])))), 2)
+ '-' + RIGHT('0' + LTRIM(RTRIM(CONVERT(NVARCHAR(10), DAY(userlog.[Date])))), 2)
, 120)
ELSE CONVERT(DATETIME, '1900-01-01', 120)
END) AS [Date_Session_START],
MAX(CASE WHEN userlog.LogType = 'LOGOFF'
THEN CONVERT(DATETIME,
LTRIM(RTRIM(CONVERT(NVARCHAR(10), YEAR(userlog.[Date]))))
+ '-' + RIGHT('0' + LTRIM(RTRIM(CONVERT(NVARCHAR(10), MONTH(userlog.[Date])))), 2)
+ '-' + RIGHT('0' + LTRIM(RTRIM(CONVERT(NVARCHAR(10), DAY(userlog.[Date])))), 2)
, 120)
ELSE CONVERT(DATETIME, '1900-01-01', 120)
END) AS [Date_Session_END],
MAX(CASE WHEN userlog.LogType = 'LOGON' THEN DATEPART(HOUR, userlog.[Date]) ELSE 0 END) AS [Hour_Session_START],
MAX(CASE WHEN userlog.LogType = 'LOGOFF' THEN DATEPART(HOUR, userlog.[Date]) ELSE 0 END) AS [Hour_Session_END],
FROM
userlog
GROUP BY
userlog.SessionID
) AS B
ON (A.[Date] >= B.[Date_Session_START] AND A.[Date] <= B.[Date_Session_END])
AND (A.[Hour] >= B.[Hour_Session_START] AND A.[Hour] <= B.[Hour_Session_END])
WHERE
A.[Date] Between @X and @Y
GROUP BY
A.[Date],
A.[Hour]
Upvotes: 1
u07ch
Reputation: 13702
OK, taken a slightly different approach. I build a table of Logon / Log Off - which could be in a cte but Im not an oracle expert so not sure if its supported so gone for simpler SQL and a temp table. I have all built a table of static integers (also known as tally table) for 0-30 to handle a test date range in my query based on your answer above - if you have one already you could just use that ranged down and save some effort. Running the query returns a table like this (using your sample data also below)
StartDate WorkingHour LoggedInUsers
2002-10-17 00:00:00.000 10 0
2002-10-17 00:00:00.000 11 0
2002-10-17 00:00:00.000 12 0
2002-10-17 00:00:00.000 13 0
2002-10-17 00:00:00.000 14 2
2002-10-17 00:00:00.000 15 5
2002-10-17 00:00:00.000 16 3
2002-10-17 00:00:00.000 17 2
2002-10-17 00:00:00.000 18 2
2002-10-17 00:00:00.000 19 1
2002-10-17 00:00:00.000 20 1
2002-10-17 00:00:00.000 21 1
2002-10-17 00:00:00.000 22 1
2002-10-17 00:00:00.000 23 0
Code as Run in sql
DECLARE @StartDate DATETIME ,
@NoDays INT ;
select
@StartDate = '2002-10-01',
@NoDays = 20;
DECLARE @Sessions TABLE (
UserRef UNIQUEIDENTIFIER,
DATE DATETIME,
LogType VARCHAR(100),
SessionID UNIQUEIDENTIFIER
);
INSERT INTO @Sessions
SELECT '96AD647C-D061-43F5-9F8D-FA6C74817E07', '2002-10-17 14:11:25.763', 'LOGON', '8D451569-0260-46BB-9B9E-F49B3E778161'
UNION SELECT '96AD647C-D061-43F5-9F8D-FA6C74817E07', '2002-10-17 18:11:32.547', 'LOGOFF', '8D451569-0260-46BB-9B9E-F49B3E778161'
UNION SELECT '60738820-5F72-4E20-A070-57E07C83B6DE', '2002-10-17 14:53:31.153', 'LOGON', 'C773894C-8B2D-4054-A550-3F04B4C5669F'
UNION SELECT '60738820-5F72-4E20-A070-57E07C83B6DE', '2002-10-17 22:55:25.607', 'LOGOFF', 'C773894C-8B2D-4054-A550-3F04B4C5669F'
UNION SELECT '90A55FDD-967E-4D99-96DF-96840CDB2CDF', '2002-10-17 15:26:40.123', 'LOGON', '1CE5F5A5-4E20-4D4A-BB67-EB0CB33976D7'
UNION SELECT '96AD647C-D061-43F5-9F8D-FA6C74817E07', '2002-10-17 15:51:28.590', 'LOGON', '7EFDEE1C-15CF-4DE1-B59F-7AFC49B4BE73'
UNION SELECT '90A55FDD-967E-4D99-96DF-96840CDB2CDF', '2002-10-17 15:58:05.217', 'LOGOFF', '1CE5F5A5-4E20-4D4A-BB67-EB0CB33976D7'
UNION SELECT '96AD647C-D061-43F5-9F8D-FA6C74817E07', '2002-10-17 15:58:31.013', 'LOGOFF', '7EFDEE1C-15CF-4DE1-B59F-7AFC49B4BE73'
UNION SELECT '90A55FDD-967E-4D99-96DF-96840CDB2CDF', '2002-10-17 15:58:32.733', 'LOGON', '03F56AB8-FED5-4CC7-8445-26BF55F58E60'
UNION SELECT '90A55FDD-967E-4D99-96DF-96840CDB2CDF', '2002-10-17 16:13:02.827', 'LOGOFF', '03F56AB8-FED5-4CC7-8445-26BF55F58E60';
DECLARE @staticintegers TABLE (myInteger INT);
INSERT INTO @staticintegers
SELECT 0 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3
UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8
UNION SELECT 9 UNION SELECT 10 UNION SELECT 11 UNION SELECT 12 UNION SELECT 13
UNION SELECT 14 UNION SELECT 15 UNION SELECT 16 UNION SELECT 17 UNION SELECT 18
UNION SELECT 19 UNION SELECT 20 UNION SELECT 21 UNION SELECT 22 UNION SELECT 23
UNION SELECT 24 UNION SELECT 25 UNION SELECT 26 UNION SELECT 27 UNION SELECT 28
UNION SELECT 29 UNION SELECT 30 UNION SELECT 31 UNION SELECT 32 UNION SELECT 33;
DECLARE @sessionsOutput TABLE (SessionID UNIQUEIDENTIFIER, StartTime DATETIME, EndTime DATETIME);
INSERT INTO @sessionsOutput
(SessionID, StartTime)
SELECT
SessionID,
[date]
FROM
@Sessions
WHERE logtype = 'Logon';
UPDATE @sessionsOutput
SET EndTime = [date]
FROM @sessionsOutput aa
INNER JOIN @Sessions bb
ON aa.SessionID = bb.SessionID
WHERE bb.LogType = 'Logoff';
SELECT
DATEADD(dd, DateIntegers.myInteger, @StartDate) AS StartDate
,hoursintegers.myINteger AS WorkingHour
,COUNT(aa.SessionID) AS LoggedInUsers
FROM
@staticintegers DateIntegers
LEFT OUTER JOIN @StaticIntegers HoursIntegers
ON HoursIntegers.myInteger BETWEEN 0 AND 23
LEFT OUTER JOIN @sessionsOutput aa
ON
HoursIntegers.myInteger BETWEEN DATEPART(hh, aa.StartTime) AND DATEPART(hh, aa.endtime)
AND CAST(aa.StartTime AS DATE) = DATEADD(dd, dateintegers.myInteger, @StartDate)
GROUP BY
DATEADD(dd, DateIntegers.myInteger, @StartDate),
HoursIntegers.myInteger
ORDER BY
DATEADD(dd, DateIntegers.myInteger, @StartDate),
HoursIntegers.myInteger;
Upvotes: 0
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