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Accurate Overlap Hours Calculations is not correct- Please help
User_YL3T0
Member Posts: 8 Green Ribbon
I have a following code but doesn't calculate Net, Overlap & Total Hours Accurately in a shift starting from 14:00:00 to 21:59:59
Can someone please help? I am using Oracle 11g R2
WITH data
AS (SELECT 1111 AS person_id,
'03-06-21' AS event_date,
To_date('03-jun-21 14:00:00', 'DD-MON-YY Hh24:MI:SS') AS start_time,
To_date('03-jun-21 21:59:59', 'DD-MON-YY Hh24:MI:SS') AS end_time,
'AAA' project_id,
'Y' AS
mandatory_work
FROM dual
UNION ALL
SELECT 1111 AS person_id,
'03-06-21' AS event_date,
To_date('3-jun-21 15:35:08', 'DD-MON-YY Hh24:MI:SS') AS start_time,
To_date('03-jun-21 21:59:59', 'DD-MON-YY Hh24:MI:SS') AS end_time,
'BBB' project_id,
'Y' AS
mandatory_work
FROM dual
UNION ALL
SELECT 1111 AS person_id,
'03-06-21' AS event_date,
To_date('03-jun-21 14:37:46', 'DD-MON-YY Hh24:MI:SS') AS start_time,
To_date('03-jun-21 14:42:46', 'DD-MON-YY Hh24:MI:SS') AS end_time,
'CCC' project_id,
'N' AS
mandatory_work
FROM dual
UNION ALL
SELECT 1111 AS person_id,
'03-06-21' AS event_date,
To_date('03-jun-21 18:08:46', 'DD-MON-YY Hh24:MI:SS') AS start_time,
To_date('03-jun-21 18:13:46', 'DD-MON-YY Hh24:MI:SS') AS end_time,
'CCC' project_id,
'N' AS
mandatory_work
FROM dual
)
--
-- end of test data
--
SELECT person_id,
start_time,
end_time,
project_id,
mandatory_work,
round(( end_time - start_time ) * 24 ,2) hours,
round(( end_time - start_time ) * 24 - Greatest(( end_time - Greatest(
start_time, Nvl(
Lag(end_time)
over (
PARTITION BY person_id, mandatory_work
ORDER BY mandatory_work DESC, start_time
ASC,
end_time DESC), start_time
)) ) * 24, 0) ,2) overlap_hrs,
round(Greatest(( end_time - Greatest(start_time, Nvl(Lag(end_time)
over (
PARTITION BY person_id, mandatory_work
ORDER BY mandatory_work DESC,
start_time
ASC,
end_time DESC), start_time
)) ) * 24, 0),2) Net_hrs
FROM data
ORDER BY person_id,
mandatory_work DESC,
start_time,
end_time;
Answers
-
Thanks for posting the data and what you've already tried.
You haven't shown what results you're expecting from your test data.
It looks as though you want to break it down to mandatory and non-mandatory work, but what about when the non-mandatory and mandatory work also overlap (rather than just the projects within mandatory/non-mandatory overlapping)?
The solution will depend on various factors, including your database version, so it's always good to say what version of the database you are using.
Looking for overlapping projects within the time frames is going to be the tricky bit, hence my question around the need to clarify if it matters that there are overlaps between the mandatory flags too?
Solutions would no doubt range from using match_recognize, to using various analytical functions etc.
So, as an example, you could break it down to each minute of the working shift and determine what was being worked on at any one minute (if really necessary you could go down to the second), and that could give you details such as...
SQL> WITH data(person_id, event_date, start_time, end_time, project_id, mandatory_work) AS ( 2 SELECT 1111, '03-06-21', To_date('03-jun-21 14:00:00', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 21:59:59', 'DD-MON-YY Hh24:MI:SS'),'AAA','Y' FROM dual UNION ALL 3 SELECT 1111, '03-06-21', To_date('03-jun-21 15:35:08', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 21:59:59', 'DD-MON-YY Hh24:MI:SS'),'BBB','Y' FROM dual UNION ALL 4 SELECT 1111, '03-06-21', To_date('03-jun-21 14:37:46', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 14:42:46', 'DD-MON-YY Hh24:MI:SS'),'CCC','N' FROM dual UNION ALL 5 SELECT 1111, '03-06-21', To_date('03-jun-21 18:08:46', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 18:13:46', 'DD-MON-YY Hh24:MI:SS'),'CCC','N' FROM dual 6 ) 7 -- 8 -- end of test data 9 -- 10 ,cal_min as ( 11 -- generate a calendar of minute by minute for the shift for the person 12 -- and map each record to the relevant minutes in the calendar 13 select d.person_id 14 ,d.event_date 15 ,d.start_time 16 ,d.end_time 17 ,d.project_id 18 ,d.mandatory_work 19 ,t.tm 20 from data d 21 join (select person_id, event_date, start_time+((level-1)/24/60) as tm 22 from (select person_id, event_date 23 ,min(start_time) as start_time 24 ,max(end_time) as end_time 25 from data 26 group by person_id, event_date 27 ) 28 connect by person_id = prior person_id 29 and event_date = prior event_date 30 and level <= ((end_time-start_time)*(24*60))+1 31 and prior sys_guid() is not null 32 ) t on (t.person_id = d.person_id and t.event_date = d.event_date and t.tm between d.start_time and d.end_time) 33 ) 34 ,overlap as ( 35 -- per person, event_date and mandatory/non-mandatory, determine the date range overall 36 -- and whether any minute in the calendar has more than one project identified against it (overlap) 37 select person_id 38 ,event_date 39 ,mandatory_work 40 ,tm 41 ,min(start_time) as start_time 42 ,max(end_time) as end_time 43 ,case when listagg('X',',') within group (order by project_id) like '%,%' then 'Y' else 'N' end as overlap 44 from cal_min c 45 group by person_id, event_date, mandatory_work, tm 46 ) 47 -- now count the number of minutes to determine hours/mins worked for each person/event/mandatory grouping 48 select person_id 49 ,event_date 50 ,mandatory_work 51 ,start_time 52 ,end_time 53 ,overlap 54 ,floor(count(*)/60) as hrs_worked 55 ,mod(count(*),60) as mins_worked 56 from overlap 57 group by person_id, event_date, mandatory_work, start_time, end_time, overlap 58 / PERSON_ID EVENT_DA M START_TIME END_TIME O HRS_WORKED MINS_WORKED ---------- -------- - -------------------- -------------------- - ---------- ----------- 1111 03-06-21 N 03-JUN-2021 14:37:46 03-JUN-2021 14:42:46 N 0 5 1111 03-06-21 N 03-JUN-2021 18:08:46 03-JUN-2021 18:13:46 N 0 5 1111 03-06-21 Y 03-JUN-2021 14:00:00 03-JUN-2021 21:59:59 Y 6 24 1111 03-06-21 Y 03-JUN-2021 14:00:00 03-JUN-2021 21:59:59 N 1 36Now, that's not a complete solution and doesn't necessarily give you all the details you were looking for (nor is it necessarily accurate as the mandatory projects cover a net time of 7h58m due to differences in seconds), but is just an idea of the complexity of what you're asking (or what I think you're asking) which would then need further work to sum up for the overall NET time etc.
-
Just to add... for "accuracy" you need to be clear on how the seconds should be handled...
In one of your examples you have the shift/time from 14:00:00 to 21:59:59, so if we take that as "inclusive seconds" we can say that is a full 8 hours (the 00:00 minute/second being worked as was the 59:59 minute/second)
Yet in your other example you have shift/time from 18:08:46 to 18:13:46, which if we take the same "inclusive" principle would be 5 minutes and 1 second (so if we're looking at a level of minutes, should that be 5, or 6?)
This is a good example of why it's necessary to state exactly what output you're expecting from your test data.
-
Thank you @BluShadow , Let me execute your code & suggestion. Also I want to add some additional information that helps solve the problem.
- I am this time not concerned with mandatory or optional for now.. but all I want to calculate accurately Net Hrs, Overlap Hrs & total Hrs. for partitioning for person id & event date. Apologies, I forgot to mention the same in original query.
- New Query is listed as follows ( Technically there is no change except I changed Partition to be on person_id & event_date:
WITH data(person_id, event_date, start_time, end_time, project_id, mandatory_work) AS ( SELECT 1111, '03-06-21', To_date('03-jun-21 14:00:00', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 21:59:59', 'DD-MON-YY Hh24:MI:SS'),'AAA','Y' FROM dual UNION ALL SELECT 1111, '03-06-21', To_date('03-jun-21 15:35:08', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 21:59:59', 'DD-MON-YY Hh24:MI:SS'),'BBB','Y' FROM dual UNION ALL SELECT 1111, '03-06-21', To_date('03-jun-21 14:37:46', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 14:42:46', 'DD-MON-YY Hh24:MI:SS'),'CCC','N' FROM dual UNION ALL SELECT 1111, '03-06-21', To_date('03-jun-21 18:08:46', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 18:13:46', 'DD-MON-YY Hh24:MI:SS'),'CCC','N' FROM dual ) -- -- end of test data -- SELECT person_id, event_date,start_time,end_time,project_id, mandatory_work, round(( end_time - start_time ) * 24 ,2) hours, round(( end_time - start_time ) * 24 - Greatest(( end_time - Greatest( start_time, Nvl( Lag(end_time) over ( PARTITION BY person_id , event_date ORDER BY start_time,end_time DESC), start_time)) ) * 24, 0) ,2)overlap_hrs, round(Greatest(( end_time - Greatest(start_time, Nvl(Lag(end_time) over (PARTITION BY person_id , event_date ORDER BY start_time,end_time DESC), start_time )) ) * 24, 0),2) Net_hrs FROM data ORDER BY person_id,event_date,mandatory_work DESC,start_time, end_time;Following is the output:
if you look at the above all the date ranges overlaps with first row. so it should give me total 8 hours instead it provide 8 +6.41 = 13.41 hours.
One more point I want to add that, I need to retain all columns & rows as the original data source.
-
Ok, again I'm just breaking this down into individual steps, so it's not necessarily optimum, but if we can ignore the mandatory/optional...
SQL> WITH data(person_id, event_date, start_time, end_time, project_id, mandatory_work) AS ( 2 SELECT 1111, '03-06-21', To_date('03-jun-21 14:00:00', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 21:59:59', 'DD-MON-YY Hh24:MI:SS'),'AAA','Y' FROM dual UNION ALL 3 SELECT 1111, '03-06-21', To_date('03-jun-21 15:35:08', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 21:59:59', 'DD-MON-YY Hh24:MI:SS'),'BBB','Y' FROM dual UNION ALL 4 SELECT 1111, '03-06-21', To_date('03-jun-21 14:37:46', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 14:42:46', 'DD-MON-YY Hh24:MI:SS'),'CCC','N' FROM dual UNION ALL 5 SELECT 1111, '03-06-21', To_date('03-jun-21 18:08:46', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 18:13:46', 'DD-MON-YY Hh24:MI:SS'),'CCC','N' FROM dual 6 ) 7 -- 8 -- end of test data 9 -- 10 ,cal_min as ( 11 -- generate a calendar of minute by minute for the shift for the person 12 -- and map each record to the relevant minutes in the calendar 13 select d.person_id 14 ,d.event_date 15 ,d.start_time 16 ,d.end_time 17 ,d.project_id 18 ,d.mandatory_work 19 ,t.tm 20 from data d 21 join (select person_id, event_date, start_time+((level-1)/24/60) as tm 22 from (select person_id, event_date 23 ,min(start_time) as start_time 24 ,max(end_time) as end_time 25 from data 26 group by person_id, event_date 27 ) 28 connect by person_id = prior person_id 29 and event_date = prior event_date 30 and level <= ((end_time-start_time)*(24*60))+1 31 and prior sys_guid() is not null 32 ) t on (t.person_id = d.person_id and t.event_date = d.event_date and t.tm between d.start_time and d.end_time) 33 ) 34 ,overlap as ( 35 -- per person, event_date determine the date range overall 36 -- and whether any minute in the calendar has more than one project identified against it (overlap) 37 select person_id 38 ,event_date 39 ,tm 40 ,min(start_time) as start_time 41 ,max(end_time) as end_time 42 ,case when listagg('X',',') within group (order by project_id) like '%,%' then 'Y' else 'N' end as overlap 43 from cal_min c 44 group by person_id, event_date, tm 45 ) 46 ,mins_breakdown as ( 47 -- now count the number of minutes to determine hours/mins worked for each person/event/mandatory grouping 48 select person_id 49 ,event_date 50 --,mandatory_work 51 ,start_time 52 ,end_time 53 ,overlap 54 ,count(*)/60 as hrs 55 from overlap 56 group by person_id, event_date, start_time, end_time, overlap 57 ) 58 select person_id 59 ,event_date 60 ,start_time 61 ,end_time 62 ,overlap 63 ,round(hrs,2) as hrs 64 ,sum(hrs) over (partition by person_id, event_date) as net_hours 65 from mins_breakdown 66 / PERSON_ID EVENT_DA START_TIME END_TIME O HRS NET_HOURS ---------- -------- -------------------- -------------------- - ---------- ---------- 1111 03-06-21 03-JUN-2021 14:00:00 03-JUN-2021 21:59:59 N 1.52 8 1111 03-06-21 03-JUN-2021 14:00:00 03-JUN-2021 21:59:59 Y 6.48 8That gives us the number of hours of overlapping projects (including the optional) and the number of hours overall.
or, if you want to exclude the optional projects from the overlap consideration, that can just be done via the listagg function with a conditional case statement...
SQL> WITH data(person_id, event_date, start_time, end_time, project_id, mandatory_work) AS ( 2 SELECT 1111, '03-06-21', To_date('03-jun-21 14:00:00', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 21:59:59', 'DD-MON-YY Hh24:MI:SS'),'AAA','Y' FROM dual UNION ALL 3 SELECT 1111, '03-06-21', To_date('03-jun-21 15:35:08', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 21:59:59', 'DD-MON-YY Hh24:MI:SS'),'BBB','Y' FROM dual UNION ALL 4 SELECT 1111, '03-06-21', To_date('03-jun-21 14:37:46', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 14:42:46', 'DD-MON-YY Hh24:MI:SS'),'CCC','N' FROM dual UNION ALL 5 SELECT 1111, '03-06-21', To_date('03-jun-21 18:08:46', 'DD-MON-YY Hh24:MI:SS'),To_date('03-jun-21 18:13:46', 'DD-MON-YY Hh24:MI:SS'),'CCC','N' FROM dual 6 ) 7 -- 8 -- end of test data 9 -- 10 ,cal_min as ( 11 -- generate a calendar of minute by minute for the shift for the person 12 -- and map each record to the relevant minutes in the calendar 13 select d.person_id 14 ,d.event_date 15 ,d.start_time 16 ,d.end_time 17 ,d.project_id 18 ,d.mandatory_work 19 ,t.tm 20 from data d 21 join (select person_id, event_date, start_time+((level-1)/24/60) as tm 22 from (select person_id, event_date 23 ,min(start_time) as start_time 24 ,max(end_time) as end_time 25 from data 26 group by person_id, event_date 27 ) 28 connect by person_id = prior person_id 29 and event_date = prior event_date 30 and level <= ((end_time-start_time)*(24*60))+1 31 and prior sys_guid() is not null 32 ) t on (t.person_id = d.person_id and t.event_date = d.event_date and t.tm between trunc(d.start_time,'MI') and d.end_time) 33 ) 34 ,overlap as ( 35 -- per person, event_date determine the date range overall 36 -- and whether any minute in the calendar has more than one project identified against it (overlap) 37 select person_id 38 ,event_date 39 ,tm 40 ,min(start_time) as start_time 41 ,max(end_time) as end_time 42 ,case when listagg(case when mandatory_work = 'Y' then 'X' else null end,',') within group (order by project_id) like '%,%' then 'Y' else 'N' end as overlap 43 from cal_min c 44 group by person_id, event_date, tm 45 ) 46 ,mins_breakdown as ( 47 -- now count the number of minutes to determine hours/mins worked for each person/event/mandatory grouping 48 select person_id 49 ,event_date 50 --,mandatory_work 51 ,start_time 52 ,end_time 53 ,overlap 54 ,count(*)/60 as hrs 55 from overlap 56 group by person_id, event_date, start_time, end_time, overlap 57 ) 58 select person_id 59 ,event_date 60 ,start_time 61 ,end_time 62 ,overlap 63 ,round(hrs,2) as hrs 64 ,sum(hrs) over (partition by person_id, event_date) as net_hours 65 from mins_breakdown 66 / PERSON_ID EVENT_DA START_TIME END_TIME O HRS NET_HOURS ---------- -------- -------------------- -------------------- - ---------- ---------- 1111 03-06-21 03-JUN-2021 14:00:00 03-JUN-2021 21:59:59 N 1.58 8 1111 03-06-21 03-JUN-2021 14:00:00 03-JUN-2021 21:59:59 Y 6.42 8Again, I'm still doing this to the minute rather than the seconds, hence my 6.42 compared to your 6.41. It could be "adjusted" in some way, but as I pointed out we either have to be "inclusive" or "exclusive" of the final seconds in the end time and your CCC project entries just go that 1 second over if we're inclusive.
-
with data(person_id,event_date,start_time,end_time,project_id,mandatory_work) as ( select 1111,'03-06-21',to_date('03-jun-21 14:00:00','dd-mon-yy hh24:mi:ss'),to_date('03-jun-21 21:59:59','dd-mon-yy hh24:mi:ss'),'AAA','Y' from dual union all select 1111,'03-06-21',to_date('03-jun-21 15:35:08','dd-mon-yy hh24:mi:ss'),to_date('03-jun-21 21:59:59','dd-mon-yy hh24:mi:ss'),'BBB','Y' from dual union all select 1111,'03-06-21',to_date('03-jun-21 14:37:46','dd-mon-yy hh24:mi:ss'),to_date('03-jun-21 14:42:46','dd-mon-yy hh24:mi:ss'),'CCC','N' from dual union all select 1111,'03-06-21',to_date('03-jun-21 18:08:46','dd-mon-yy hh24:mi:ss'),to_date('03-jun-21 18:13:46','dd-mon-yy hh24:mi:ss'),'CCC','N' from dual ), t1 as ( select d.*, lag(end_time,1,end_time - 1) over(partition by person_id,event_date order by start_time,end_time desc) prev_end_time from data d ), t2 as ( select t1.*, round((end_time - start_time) * 24,2) hours, round((greatest(end_time,prev_end_time) - greatest(start_time,prev_end_time)) * 24,2) net_hours from t1 ) select person_id, event_date, start_time, end_time, project_id, mandatory_work, hours, hours - net_hours overlap_hours, net_hours from t2 order by person_id, event_date, start_time, end_time desc / PERSON_ID EVENT_DATE START_TIME END_TIME PROJECT_ID MANDATORY_WORK HOURS OVERLAP_HOURS NET_HOURS ---------- ---------- ------------------- ------------------- ---------- -------------- ---------- ------------- ---------- 1111 03-06-21 06/03/2021 14:00:00 06/03/2021 21:59:59 AAA Y 8 0 8 1111 03-06-21 06/03/2021 14:37:46 06/03/2021 14:42:46 CCC N .08 .08 0 1111 03-06-21 06/03/2021 15:35:08 06/03/2021 21:59:59 BBB Y 6.41 0 6.41 1111 03-06-21 06/03/2021 18:08:46 06/03/2021 18:13:46 CCC N .08 .08 0 SQL>SY.
-
Solomon... why does your project BBB have overlap_hours of 0? Surely it should be 6.41 as it overlaps with project AAA? At least that's my understanding of the OP's requirement... (I certainly could be wrong! 😁 )
Edit: Ah, I see the OP's spreadsheet has it as 0.00 as well. I guess I'm wrong then.
Another example where we need detailed requirements and logic explaining I guess.
Edit again: I guess it was the OP saying "if you look at the above all the date ranges overlaps with first row" that confused me, as it implies that everything is overlapping the AAA which covers the full shift, so I was expecting BBB to be considered as an overlap too.
-
Agreed OP's requirements are strange. Same as you, I'd use:
with data(person_id,event_date,start_time,end_time,project_id,mandatory_work) as ( select 1111,'03-06-21',to_date('03-jun-21 14:00:00','dd-mon-yy hh24:mi:ss'),to_date('03-jun-21 21:59:59','dd-mon-yy hh24:mi:ss'),'AAA','Y' from dual union all select 1111,'03-06-21',to_date('03-jun-21 15:35:08','dd-mon-yy hh24:mi:ss'),to_date('03-jun-21 21:59:59','dd-mon-yy hh24:mi:ss'),'BBB','Y' from dual union all select 1111,'03-06-21',to_date('03-jun-21 14:37:46','dd-mon-yy hh24:mi:ss'),to_date('03-jun-21 14:42:46','dd-mon-yy hh24:mi:ss'),'CCC','N' from dual union all select 1111,'03-06-21',to_date('03-jun-21 18:08:46','dd-mon-yy hh24:mi:ss'),to_date('03-jun-21 18:13:46','dd-mon-yy hh24:mi:ss'),'CCC','N' from dual ), t1 as ( select d.*, nvl( max(end_time) over( partition by person_id, event_date order by start_time, end_time desc rows between unbounded preceding and 1 preceding ), end_time - 1 ) prev_max_end_time from data d ), t2 as ( select t1.*, round((end_time - start_time) * 24,2) hours, round((greatest(end_time,prev_max_end_time) - greatest(start_time,prev_max_end_time)) * 24,2) net_hours from t1 ) select person_id, event_date, start_time, end_time, project_id, mandatory_work, hours, hours - net_hours overlap_hours, net_hours from t2 order by person_id, event_date, start_time, end_time desc / PERSON_ID EVENT_DATE START_TIME END_TIME PROJECT_ID MANDATORY_WORK HOURS OVERLAP_HOURS NET_HOURS ---------- ---------- ------------------- ------------------- ---------- -------------- ---------- ------------- ---------- 1111 03-06-21 06/03/2021 14:00:00 06/03/2021 21:59:59 AAA Y 8 0 8 1111 03-06-21 06/03/2021 14:37:46 06/03/2021 14:42:46 CCC N .08 .08 0 1111 03-06-21 06/03/2021 15:35:08 06/03/2021 21:59:59 BBB Y 6.41 6.41 0 1111 03-06-21 06/03/2021 18:08:46 06/03/2021 18:13:46 CCC N .08 .08 0 SQL>SY.
