months person is active

1 -how is this different from your previous question?  If it's not, then simply use that answer here.
   If it is different, please explain how?

2 - Why is end_dt using 2-digit years and the other dates 4-digit years?

First question - what are the date formats (I assume the fields are varchar2)?
Second question - if RCD 6 started 2014-12-12 (I assume to be December 12, 2014) and ended 15-12-12 (assumed to be December 12, 2015). why wouldn't the months active in Q3 be 4, since he/she would have been active December, 2014, October, 2015, November, 2015, and December, 2015?

(Not a direct answer) I have an article out there T-SQL:  Identify Bad Dates in a Time Series which is SQL Server T-SQL with a bunch of Common Table Expressions (CTE's) that analyze a time series for custom logic such as gaps, overlaps, and duplicates.  This code should be very transferrable to Oracle, and you can modify the custom logic to suit your needs.

I should have asked part2 not part1 so lets start from there

My question is how can i find fiscal_quater range .

Source:


Records look like this:

EFFDT           EMPLID   RCD   ACTION   START_DT      END_DT     EMPL_STATUS

2007-12-12        101     0     ADL      2007-12-12     2015-08-10       A
2014-12-12        101     6     PAY      2014-12-12     2015-12-12       A

2015-07-24        101     6     REO      2014-12-12      null            A

2015-08-12        101     0     ADL      2007-12-12      2015-08-10      T



2015-12-24        101     6     TER      2014-12-12      2015-12-12     T


Target:


Want to see how many months employee are active for Q3 ( Q3-Starts from October till December)


In this case employee with RCD 6 is active(Action ADL tells employee is active) for Q3 for 12 months.


EFFDT           EMPLID   RCD   ACTION   START_DT      END_DT     EMPL_STATUS months_active



2014-12-12        101     6     ADL      2014-12-12     15-12-12      A       12


If i want to see Q2 active i should get  results like below.


EFFDT           EMPLID   RCD   ACTION   START_DT      END_DT     EMPL_STATUS months_active

2007-12-12        101     0     ADL      2007-12-12     2015-08-10       A     9

2014-12-12        101     6     ADL      2014-12-12     15-12-12      A       12

When you say Q3  do you mean "any" Q3?  

That is, a record from November of 1982  would count because that's active in Q3?  Or  a record for December 2037?

Or, do you mean Q3 as in the most recent period Oct-Dec based on the current date?
So, since today is Feb 3, 2016,  then Q3 means Oct-Dec of 2015?


Also, in your Q2 example.  
The first row shows active for 9 months.  Where does that number come from?  The record looks like it was active for almost 8 years.

The second row shows 12 months active.  But in Q2 that person would have only been there for 9 months.
Is that a mistake in your example, or are you not looking for time "as of" a particular quarter?

I think a little more clarification is needed. Are you trying to say that, if an employee's start_dt or end_dt encompasses some time in Q3, compute the number of active months from the month of the end_dt back to the month of the start_dt ? So RCD 0 would be from December 2014 to August 2015 and RCD 6 would be from December 2014 to December 2015. The problem I see is that the difference between the two would be 8 and 12 and the count of the months the employee was active would be 9 and 13?

1)Months active is months between start_dt and end_dt

2)Right now i am just asking 2015 Q3 but this is just example so how we get Quater is

if we see for data range falling between start date and end date between 2015 Q3 pick that record

else ignore that

Example in below case date range falls between 2014-12-12 to 2015-12-12 so if i say give me anything
which falls in quarter 2015 Q3 i should pick up this record.

EFFDT           EMPLID   RCD   ACTION   START_DT      END_DT     EMPL_STATUS months_active



2014-12-12        101     6     ADL      2014-12-12     15-12-12      A       12

you keep changing date formats

15-12-12
2015-12-12


which do you want? or do you not want formatted text but instead want date values returned?

assuming you want dates try this...

SELECT t.*, MONTHS_BETWEEN(end_dt, start_dt) months_active
  FROM yourtable t
 WHERE     action = 'ADL'
       AND end_dt >= TO_DATE('2015-10-01', 'yyyy-mm-dd')   -- Q3 start
       AND start_dt <= TO_DATE('2015-12-31', 'yyyy-mm-dd')  -- Q3 end


comparing the end to the start and the start to the end is intentional, not a typo

I don't want to do below I want to create date table and link this table to date and just say 2015-Q3
and it will give me all results and so on

 end_dt >= TO_DATE('2015-10-01', 'yyyy-mm-dd')   -- Q3 start
 AND start_dt <= TO_DATE('2015-12-31', 'yyyy-mm-dd')  -- Q3 end