SQL max samtidige sessioner pr. time på dagen

OK, taget en lidt anden tilgang. Jeg bygger en tabel med Logon / Log Off - som kunne være i en cte, men jeg er ikke en orakelekspert, så jeg er ikke sikker på, om den understøttes, så forsvundet for enklere SQL og en midlertidig tabel. Jeg har alle bygget en tabel med statiske heltal (også kendt som taltabel) for 0-30 for at håndtere et testdatointerval i min forespørgsel baseret på dit svar ovenfor - hvis du allerede har en, kan du bare bruge den nedadgående rækkevidde og gemme nogle indsats. Kørsel af forespørgslen returnerer en tabel som denne (ved hjælp af dine eksempeldata også nedenfor)

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

Kode som Kør i 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;