select
(MONTHS_BETWEEN ( TRUNC(TO_DATE(‘2018-08-01‘,‘YYYY-MM-DD‘),‘MONTH‘), TRUNC(TO_DATE(‘2018-05-30‘,‘YYYY-MM-DD‘),‘MONTH‘) ) + 1) MONTH_COUNT
from dual;

select
(MONTHS_BETWEEN ( to_date(to_char(sysdate,‘yyyy-MM‘),‘yyyy-MM‘), to_date(to_char(to_date(‘2019-06-30‘,‘yyyy-MM-dd‘),‘yyyy-MM‘),‘yyyy-MM‘) ) + 1) MONTH_COUNT
from dual;

select
TO_CHAR(ADD_MONTHS(TO_DATE(‘2019-08-01‘,‘YYYY-MM-DD‘),(ROWNUM - 1)), ‘yyyy-mm‘) MOHTN_ID
from
dual CONNECT BY ROWNUM <= MONTHS_BETWEEN ( TRUNC(TO_DATE(‘2020-01-01‘,‘YYYY-MM-DD‘),‘MONTH‘), TRUNC(TO_DATE(‘2019-08-01‘,‘YYYY-MM-DD‘),‘MONTH‘) ) + 1;

结果: MOHTN_ID
    2019-08
    2019-09
    2019-10
    2019-11
    2019-12
    2020-01

SELECT
TO_CHAR(TO_DATE(‘2018-01-28‘, ‘YYYY-MM-DD‘) + ROWNUM - 1, ‘YYYY-MM-DD‘) DAY_ID
FROM
DUAL CONNECT BY ROWNUM <= TO_DATE(‘2018-02-04‘, ‘YYYY-MM-DD‘) - TO_DATE(‘2018-01-28‘, ‘YYYY-MM-DD‘) + 1;

结果: DAY_ID
    2018-01-28
    2018-01-29
    2018-01-30
    2018-01-31
    2018-02-01
    2018-02-02
    2018-02-03
    2018-02-04