在計(jì)算月份的時(shí)候除了add_months,還可用INTERVAL:
1.Connected to Oracle Database 11g Enterprise Edition Release 11.1.0.7.0
2.Connected as xxpo 3.
4.SQL>
5.SQL> SELECT to_char(SYSDATE,'YYYY/MM/DD HH24:MI:SS') now FROM dual; 6.
7.NOW
8.-------------------
9.2011/05/20 06:22:00
10.SQL> SELECT to_char(add_months(SYSDATE,-1),'YYYY/MM/DD HH24:MI:SS') "1 month before" FROM dual; 11.
12.1 month before
13.-------------------
14.2011/04/20 06:22:02
15.SQL> SELECT to_char(SYSDATE + INTERVAL '-1' MONTH,'YYYY/MM/DD HH24:MI:SS') "1 month before" FROM dual; 16.
17.1 month before
18.-------------------
19.2011/04/20 06:22:04
20.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; 21.
22.1 year and 1 month later
23.------------------------
24.2012/06/20 06:22:06
25.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; 26.
27.1 year and 1 month before
28.-------------------------
29.2010/04/20 06:22:08
30.
31.SQL>
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