I need to modify a procedure to make statistics on my database.
I got a temporary table which contains all the data that I need to make those statistics.
It contains all the relevant actions FormIdNb of the working units NumCavalier in one day :
-- Every action from all units will be stored in this temp table -- DateHeure = Time of action -- NumCavalier = ID of working unit -- FormIdNb = Action type CREATE TABLE #tmp_DailyMissions ( DateHeure datetime, NumCavalier nchar(3), FormIdNb int ) INSERT INTO #tmp_DailyMissions SELECT DateHeure, Cavalier.NumCavalier, FormIdNb FROM ECN4, Cavalier WHERE (DateHeure BETWEEN @StartTime AND @EndTime) AND (Cavalier.Terminal = @terminal) AND (Cavalier.NumCavalier = ECN4.NumCavalier)
This temporary table will store all actions that all the working units made in one entire day (just as a logging system).
The significant values for FormIdNb are :
FormIdNb > 3 ==> The working unit was active
FormIdNb = 3 ==> The working unit was idle
FormIdNb < 3 ==> The working unit was inactive
The request that I got right now (Thanks to @AndriyM), returns the number of working units who were ACTIVE, IDLE and INACTIVE on each interval of time of the day (15min) :
WITH time_cte(StartTime, EndTime) AS ( SELECT StartTime = @starttime, EndTime = DATEADD(mi, 15, @starttime) UNION ALL SELECT EndTime, DATEADD(mi, 15, EndTime) FROM time_cte WHERE EndTime < @EndTime ) SELECT t.StartTime, ActiveUnitCount = COUNT(DISTINCT(CASE WHEN d.FormIdNb > 3 THEN d.NumCavalier END)), IdleUnitCount = COUNT(DISTINCT(CASE WHEN d.FormIdNb = 3 THEN d.NumCavalier END)), InactiveUnitCount = COUNT(DISTINCT(CASE WHEN d.FormIdNb < 3 THEN d.NumCavalier END)) FROM time_cte AS t LEFT OUTER JOIN #tmp_DailyMissions AS d ON d.DateHeure >= t.StartTime AND d.DateHeure < t.EndTime GROUP BY t.StartTime ;
The problem is, as I said above, that the temporary table I use store the data as a logging system.
This means that it can contain, for a working unit on a same interval of time, any value of FormIdNb.
For example : 1 row FormIdNb = 2, 1 row FormIdNb = 3 and 1 row FormIdNb = 4.
My question is :
How to make a request who get rid of irrelevant values ?
More precisely :
If a working unit was ACTIVE, but was also IDLE and/or INACTIVE on an interval of time, how to "remove" this working unit from the IDLE and INACTIVE counts, and only keep the maximum value of FormIdNb for each intervals of time ?