Latest 12 months

I have the following scenario, where I need data from the input data of the last 12 months.

Entry date is February 1, 2015, and must last 12 months data available in the table.

In the following query has given 1 February 2015 and the last 12 months after that date would be 1 February 14 February 1, 15.

But getting out of 1 March 14 to February 1, 15 (August record is missing in the data below)

with t as (
select to_date('1-DEC-2013') from_dt from dual UNION ALL
select to_date('1-JAN-2014') from dual UNION ALL
select to_date('1-FEB-2014') from dual UNION ALL
select to_date('1-MAR-2014') from dual UNION ALL
select to_date('1-APR-2014') from dual UNION ALL
select to_date('1-MAY-2014') from dual UNION ALL
select to_date('1-JUN-2014') from dual UNION ALL
select to_date('1-JUL-2014') from dual UNION ALL
select to_date('1-SEP-2014') from dual UNION ALL
select to_date('1-OCT-2014') from dual UNION ALL
select to_date('1-NOV-2014') from dual UNION ALL
select to_date('1-DEC-2014') from dual UNION ALL
select to_date('1-JAN-2015') from dual UNION ALL
select to_date('1-FEB-2015') from dual )
select * from t 
where from_dt between add_months(to_date ('1-FEB-2015') , -11)
and to_date ('1-FEB-2015')

August record is missing in the output because as its not available in the source. If you want to generate missing months and then filter the output then you can do it like this

SQL> with t as
  2  (
  3  select to_date('1-DEC-2013') from_dt from dual UNION ALL
  4  select to_date('1-JAN-2014') from dual UNION ALL
  5  select to_date('1-FEB-2014') from dual UNION ALL
  6  select to_date('1-MAR-2014') from dual UNION ALL
  7  select to_date('1-APR-2014') from dual UNION ALL
  8  select to_date('1-MAY-2014') from dual UNION ALL
  9  select to_date('1-JUN-2014') from dual UNION ALL
 10  select to_date('1-JUL-2014') from dual UNION ALL
 11  select to_date('1-SEP-2014') from dual UNION ALL
 12  select to_date('1-OCT-2014') from dual UNION ALL
 13  select to_date('1-NOV-2014') from dual UNION ALL
 14  select to_date('1-DEC-2014') from dual UNION ALL
 15  select to_date('1-JAN-2015') from dual UNION ALL
 16  select to_date('1-FEB-2015') from dual
 17  )
 18  select from_dt
 19    from (
 20            select add_months(from_dt, level-1) from_dt
 21              from (
 22                      select from_dt
 23                           , nvl(months_between(lead(from_dt) over( order by from_dt), from_dt), 1) month_count
 24                        from t
 25                   )
 26            connect
 27                 by level <= month_count
 28                and prior from_dt = from_dt
 29                and prior sys_guid() is not null
 30         )
 31   where from_dt between add_months(to_date('01-FEB-2015', 'DD-MON-YYYY'), -11)
 32                     and to_date('01-FEB-2015', 'DD-MON-YYYY');

FROM_DT
---------
01-MAR-14
01-APR-14
01-MAY-14
01-JUN-14
01-JUL-14
01-AUG-14
01-SEP-14
01-OCT-14
01-NOV-14
01-DEC-14
01-JAN-15
01-FEB-15

12 rows selected.

Tags: Database

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