finding the max number of consecutive days of absence for any person who has more than a specified number of days - sql

Question

I am working on an absence report and am having a hard time figuring out how to obtain the number of consecutive days an employee has off anytime they have 6 or more absences consecutively. I am able to get the max number for the employee but if an employee has more than one instance of this occurring within the given start and end date parameters, this max number of absences will only give me the highest number of absences. The following data set shows what I mean:
ClientID EmplID Date AbsentFlag NumOfDays RowNum
10 2587 2019-07-14 Y 1 4
10 2587 2019-07-15 Y 2 5
10 2587 2019-07-16 Y 3 6
10 2587 2019-07-19 Y 4 7
10 2587 2019-07-20 Y 5 8
10 2587 2019-07-21 Y 6 9
10 2587 2019-07-22 Y 7 10
10 2587 2019-07-23 Y 8 11
10 2587 2019-07-26 Y 9 12
10 2587 2019-07-27 Y 10 13
10 2587 2019-07-28 Y 11 14
10 2587 2019-07-29 Y 12 15
10 2587 2019-07-30 Y 13 16
10 2587 2019-08-03 Y 1 17
10 2587 2019-08-04 Y 2 18
10 2587 2019-08-05 Y 3 19
10 2587 2019-08-06 Y 4 20
10 2587 2019-08-09 Y 5 21
10 2587 2019-08-10 Y 6 22
10 2587 2019-08-11 Y 7 23
10 2587 2019-08-12 Y 8 24
10 2587 2019-08-13 Y 9 25
This employee, for example, has 13 consecutive days of absence(more than 6), as well as 9 consecutive days of absence (more than 6). In my report, I need to include the first 6 dates of absence, as well as the total number of absences for each consecutive streak. So for the results, I would expect this:
ClientID EmplID Days Date1 Date2 Date3 Date4 Date5 Date6
10 2587 13 2019-07-14 2019-07-15 2019-07-16 2019-07-19 2019-07-20 2019-07-21
10 2587 9 2019-08-03 2019-08-04 2019-08-05 2019-08-06 2019-08-09 2019-08-10
Currently, I am getting this:
ClientID EmplID Days Date1 Date2 Date3 Date4 Date5 Date6
10 2587 13 2019-07-14 2019-07-15 2019-07-16 2019-07-19 2019-07-20 2019-07-21
10 2587 13 2019-08-03 2019-08-04 2019-08-05 2019-08-06 2019-08-09 2019-08-10
Let me know if I can provide anything else to help solve this issue. Thanks.

Answer 1

You can identify the first day of an absence using the different of a sequence from numofdays. Then aggregate and filter:
select clientid, empid, max(days),
max(case when numofdays = 1 then date end) as day_1,
max(case when numofdays = 2 then date end) as day_2,
max(case when numofdays = 3 then date end) as day_3,
max(case when numofdays = 4 then date end) as day_4,
max(case when numofdays = 5 then date end) as day_5,
max(case when numofdays = 6 then date end) as day_6
from (select t.*,
row_number() over (partition by clientid, empid order by date) as seqnum
from t
) t
group by clientid, empid, (seqnum - numofdays)
having max(numofdays) >= 6