Create rows between two dates - sql

Question

I have the below table. I need to create a row for each month from hire_dt to term_dt
id hire_dt term_dt
1 08/07/2017 02/20/2018
Expected Results:
id hire_dt term_dt Month level_alias
1 08/07/2017 10/20/2017 201708 1
1 08/07/2017 10/20/2017 201709 2
1 08/07/2017 10/20/2017 201710 3
Query:
SELECT DISTINCT
ID,
HIRE_DT,
TERM_DT,
TO_CHAR(ADD_MONTHS(TRUNC(HIRE_DT, 'MM'), LEVEL -1), 'YYYYMM') AS MONTH,
LEVEL AS LEVEL_ALIAS
FROM AHR
JOIN HA ON ID = HA.id --AND RNK = 1
WHERE 1=1
CONNECT BY LEVEL <= 1 + MONTHS_BETWEEN(TRUNC(TERM_DT,'MM'),TRUNC(HIRE_DT,'MM'))
AND PRIOR ID = ID AND PRIOR HIRE_DT=HIRE_DT
AND PRIOR SYS_GUID() IS NOT NULL
AND AHR.ASSOC_AIN_ID = 1
Results:
id hire_dt term_dt Month level_alias
1 08/07/2017 201708 1
1 08/07/2017 10/20/2017 201708 1
1 08/07/2017 10/20/2017 201709 2
1 08/07/2017 10/20/2017 201710 3
Why am I receiving the null term_dt?

Answer 1

Based on (somewhat misleading; 10/20/2017 vs. 02/20/2018) sample data you provided, have a look at this:
SQL> with test (id, hire_dt, term_dt) as
2 (select 1, date '2017-08-07', date '2017-10-20' from dual)
3 select id,
4 hire_dt,
5 term_dt,
6 to_char(add_months(hire_dt, level - 1), 'yyyymm') month,
7 level lvl
8 from test
9 connect by level <= months_between(term_dt, hire_dt) + 1;
ID HIRE_DT TERM_DT MONTH LVL
---------- ---------- ---------- ------ ----------
1 08/07/2017 10/20/2017 201708 1
1 08/07/2017 10/20/2017 201709 2
1 08/07/2017 10/20/2017 201710 3
SQL>
It might need to be modified, but - as I said, with information you provided, that's it (i.e. I have no idea what tables you're joining and why).