Oracle日期加减

1.直接加减数字

SELECT SYSDATE "当前时间",
       SYSDATE + 1 "加一天",
       SYSDATE + (1 / 24) "加一小时",
       SYSDATE + (1 / 24 / 60) "加一分钟",
       SYSDATE + (1 / 24 / 60 / 60) "加一秒钟",
       SYSDATE - 1 "减一天"
  FROM dual;

 2.通过ADD_MONTHS()函数

SELECT SYSDATE "当前时间",
       ADD_MONTHS(SYSDATE, 1) "加一月",
       ADD_MONTHS(SYSDATE, -1) "减一月",
       ADD_MONTHS(SYSDATE, 1 * 12) "加一年",
       ADD_MONTHS(SYSDATE, -1 * 12) "减一年"
  FROM dual;

 3.使用INTERVAL函数

SELECT SYSDATE "当前时间",
       SYSDATE + INTERVAL '1' YEAR "加一年",
       SYSDATE + INTERVAL '-1' YEAR "减一年",
       SYSDATE + INTERVAL '1' MONTH "加一月",
       SYSDATE + INTERVAL '1' DAY "加一天",
       SYSDATE + INTERVAL '1' HOUR "加一小时",
       SYSDATE + INTERVAL '1' MINUTE "加一分钟",
       SYSDATE + INTERVAL '1' SECOND "加一秒"
  FROM dual;