这篇文章主要介绍oracle中如何修改NLS_DATE_LANGUAGE，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
一、 NLS_DATE_LANGUAGE
下面是临时修改nls_date_language参数为中文，以方便当前会话导入'08-12月-13
03.16.19.119000 下午'之类的数据。
报错ORA-01843: not a valid month解决
1、查看NLS_TIMESTAMP_FORMAT和NLS_DATE_LANGUAGE参数和SYSTIMESTAMP 数据格式
SQL>
select * from v$nls_parameters;
PARAMETER
VALUE
----------------------------------------------------------------
----------------------------------------------------------------
NLS_LANGUAGE AMERICAN
NLS_TERRITORY
AMERICA
NLS_CURRENCY
$
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CALENDAR
GREGORIAN
NLS_DATE_FORMAT
DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_CHARACTERSET
ZHS16GBK
NLS_SORT
BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT
DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT
HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY
$
NLS_NCHAR_CHARACTERSET
AL16UTF16
NLS_COMP
BINARY
NLS_LENGTH_SEMANTICS
BYTE
NLS_NCHAR_CONV_EXCP
FALSE
19 rows
selected
SQL>
SELECT SYSTIMESTAMP FROM DUAL;
SYSTIMESTAMP
--------------------------------------------------------------------------------
11-FEB-18
09.59.08.147761 AM +08:00
2、确定NLS_TIMESTAMP_FORMAT格式
如果参数NLS_TIMESTAMP_FORMAT格式不是DD-MON-RR HH.MI.SSXFF AM首先要调整该参数
调整该参数的命令：alter session set
NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH.MI.SS.FF8 AM';
注：该命令只是当前会话有用。
3、确定NLS_DATE_LANGUAGE格式
查看NLS_DATE_LANGUAGE是SIMPLIFIED
CHINESE还是AMERICA，如果是AMERICA需要修改成SIMPLIFIED
CHINESE，
才能显示中文上下午和月份，当前会话修改方法
SQL> ALTER SESSION SET
nls_date_language='SIMPLIFIED CHINESE';
注：该命令只是当前会话有用。
4、修改后参数
SQL>
select * from v$nls_parameters;
/
PARAMETER
VALUE
----------------------------------------------------------------
----------------------------------------------------------------
NLS_LANGUAGE AMERICAN
NLS_TERRITORY
AMERICA
NLS_CURRENCY
$
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CALENDAR
GREGORIAN
NLS_DATE_FORMAT
DD-MON-RR
NLS_DATE_LANGUAGE SIMPLIFIED
CHINESE
NLS_CHARACTERSET
ZHS16GBK
NLS_SORT
BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT
DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT
HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY
$
NLS_NCHAR_CHARACTERSET
AL16UTF16
NLS_COMP
BINARY
NLS_LENGTH_SEMANTICS
BYTE
NLS_NCHAR_CONV_EXCP
FALSE
5、查看类型：
SQL>
select systimestamp from dual;
/
SYSTIMESTAMP
--------------------------------------------------------------------------------
11-2月 -18
09.38.29.190818 上午 +08:00
6、导入数据：
SQL> @
Importing
table SYS_AREA...
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