Datepart equivalent in oracle for date function

Question

I was trying to convert the sqlserver query to oracle and found a function which is not available in ora, could you plz help me in converting this
select top 5 ssm.maturity,datepart(mm, dateadd(mm, -3, ssm.maturity)) from sec_ind_ss ssm;
2014-10-23 00:00:00.0       7
9999-12-31 00:00:00.0       9
2021-01-02 00:00:00.0       10
2022-07-31 00:00:00.0       4
2019-07-31 00:00:00.0       4
I tried this but no result
SELECT ssm.maturity ,CAST(EXTRACT(MONTH FROM ssm.maturity - NUMTOYMINTERVAL(3,'month')) AS VARCHAR2(30))
from sec_ind_ss ssm WHERE ROWNUM<=5;

Answer 1

Really? Here's what I get:
alter session set nls_date_format = 'RRRR-MM-DD';
col date_minus3 format a11
with sec_ind_ss as
( select date '2014-01-31' maturity from dual union all
   select date '2014-10-23' from dual union all
   select date '9999-12-31' from dual union all
   select date '2021-01-02' from dual union all
   select date '2022-07-31' from dual union all
   select date '2019-07-31' from dual )
select maturity
     , add_months(maturity,-3) as date_minus3
     , to_number(to_char(add_months(maturity,-3),'fmMM')) as month_minus3
from   sec_ind_ss;
MATURITY   DATE_MINUS3 MONTH_MINUS3
2014-01-31 2013-10-31            10
2014-10-23 2014-07-23             7
9999-12-31 9999-09-30             9
2021-01-02 2020-10-02            10
2022-07-31 2022-04-30             4
2019-07-31 2019-04-30             4