解决next_day（当前日期下星期星期几对应日期）报错原因
select next_day (sysdate,'TUESDAY') NEXT_DAY FROM DUAL;
ERROR 位于第 1 行:
ORA-01846: 周中的日无效
select next_day (sysdate,'星期二') NEXT_DAY FROM DUAL;
NEXT_DAY
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27-7月-10
修改nls_date_language
alter session set nls_date_language='American';
select next_day (sysdate,'TUESDAY') NEXT_DAY FROM DUAL;
NEXT_DAY
-------------------------
27-7月-10
修改nls_date_language
alter session set nls_date_language='simplified chinese';
select next_day (sysdate,'星期二') NEXT_DAY FROM DUAL;
NEXT_DAY
-------------------------
27-7月-10
还可以使用next_day (sysdate,n),和参数nls_date_language就没关系了
select next_day (sysdate,3) NEXT_DAY FROM DUAL;
NEXT_DAY
-------------------------
27-7月-10
查询中直接使用NLS_DATE_LANGUAGE参数
select to_char(sysdate,'Day','NLS_DATE_LANGUAGE = American') from dual;
TO_CHAR(SYSDATE,'DAY','NLS_DATE_LANGUAGE=AMERICAN')
---------------------------------------------------
Tuesday
select to_char(sysdate,'DD-MON-YY','NLS_DATE_LANGUAGE = American') vdate from dual;
VDATE
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20-JUL-10
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