Oracle日期计算之INTERVAL
Oracle日期计算之INTERVAL
在计算月份的时候除了add_months,还可用INTERVAL:
- Connected to Oracle Database 11g Enterprise Edition Release 11.1.0.7.0
- Connected as xxpo
- SQL>
- SQL> SELECT to_char(SYSDATE,'YYYY/MM/DD HH24:MI:SS') now FROM dual;
- NOW
- -------------------
- 2011/05/20 06:22:00
- SQL> SELECT to_char(add_months(SYSDATE,-1),'YYYY/MM/DD HH24:MI:SS') "1 month before" FROM dual;
- 1 month before
- -------------------
- 2011/04/20 06:22:02
- SQL> SELECT to_char(SYSDATE + INTERVAL '-1' MONTH,'YYYY/MM/DD HH24:MI:SS') "1 month before" FROM dual;
- 1 month before
- -------------------
- 2011/04/20 06:22:04
- SQL> SELECT to_char(SYSDATE + INTERVAL '1-1' YEAR TO MONTH,'YYYY/MM/DD HH24:MI:SS') "1 year and 1 month later" FROM dual;
- 1 year and 1 month later
- ------------------------
- 2012/06/20 06:22:06
- SQL> SELECT to_char(SYSDATE + INTERVAL '-1-1' YEAR TO MONTH,'YYYY/MM/DD HH24:MI:SS') "1 year and 1 month before" FROM dual;
- 1 year and 1 month before
- -------------------------
- 2010/04/20 06:22:08
- SQL>
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