1、日期格式YYYY-MM-DD
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
2、日期格式YYYY-MM