ORACLE——日期时间格式化参数详解 之三

SQL> select to_char(SYSTIMESTAMP,‘Y,YYY‘) from dual;
TO_CHAR(SYSTIMESTAMP,‘Y,YYY‘)
-----------------------------
2,015

SQL> select to_char(sysdate,‘Y‘) from dual;
TO_CHAR(SYSDATE,‘Y‘)
--------------------
5

SQL> select to_char(sysdate,‘YY‘) from dual;
TO_CHAR(SYSDATE,‘YY‘)
---------------------
15

SQL> select to_char(sysdate,‘YYY‘) from dual;
TO_CHAR(SYSDATE,‘YYY‘)
----------------------
015

SQL> select to_char(sysdate,‘YYYY‘) from dual;
TO_CHAR(SYSDATE,‘YYYY‘)
-----------------------
2015

SQL> select to_char(sysdate,‘W‘) from dual;
TO_CHAR(SYSDATE,‘W‘)
--------------------
4

SQL> select to_char(sysdate,‘WW YYYY-MM-DD‘) from dual;
TO_CHAR(SYSDATE,‘WWYYYY-MM-DD‘
------------------------------
52 2015-12-27

SQL> select to_char(sysdate,‘IW YYYY-MM-DD‘) from dual;
TO_CHAR(SYSDATE,‘IWYYYY-MM-DD‘
------------------------------
52 2015-12-27

SQL> select to_char(sysdate,‘Q YYYY-MM-DD‘) from dual;
TO_CHAR(SYSDATE,‘QYYYY-MM-DD‘)
------------------------------
**4** 2015-12-27

SQL> select to_char(sysdate,‘DY  YYYY-MM-DD‘) from dual;
TO_CHAR(SYSDATE,‘DYYYYY-MM-DD‘
------------------------------
星期日  2015-12-27

SQL> alter session set nls_language=‘AMERICAN‘;
Session altered

SQL> select to_char(sysdate,‘dy‘) from dual;
TO_CHAR(SYSDATE,‘DY‘)
---------------------
sun