加减年、月、日、时、分、秒

CREATE OR REPLACE VIEW v AS
SELECT TO_DATE(‘2015-1-1 13:14:15‘, ‘YYYY-MM-DD HH24:MI:SS‘) AS c FROM DUAL;

SELECT * FROM v;

SELECT c AS 原日期,
       c - 5 AS 减5天,
       c + 5 AS 加5天,
       ADD_MONTHS(c, -5) AS 减5个月,
       ADD_MONTHS(c, 5) AS 加5个月,
       ADD_MONTHS(c, -5 * 12) AS 减5年,
       ADD_MONTHS(c, 5 * 12) AS 加5年,
       c - 5 / 60 / 60 / 24 AS 减5秒,
       c + 5 / 60 / 60 / 24 AS 加5秒,
       c - 5 / 60 / 24 AS 减5分钟,
       c + 5 / 60 / 24 AS 加5分钟,
       c - 5 / 24 AS 减5小时,
       c + 5 / 24 AS 加5小时
  FROM v;