ORALCE 中查询当前月的所有日期

1. 查询将来 6 个月的月份：

SELECT to_char(add_months(SYSDATE, ROWNUM), 'yyyy-mm')
  FROM dual
CONNECT BY ROWNUM <= 6

2. 查询当前月的所有日期

SELECT TRUNC(SYSDATE, 'MM') + ROWNUM - 1
  FROM DUAL
CONNECT BY ROWNUM <= TO_NUMBER(TO_CHAR(LAST_DAY(SYSDATE), 'dd'))