怎么更改當前的USERENV('LANG')返回值 oracle

[php] SQL> ALTER SESSION SET NLS_LANGUAGE='AMERICAN'; Session altered. SQL> select USERENV('LANG') from dual; USERENV('LANG') ---------------------------------------------------- US SQL>  ALTER SESSION SET NLS_LANGUAGE='SIMPLIFIED CHINESE'; 会话已更改。 SQL> select USERENV('LANG') from dual; USERENV('LANG') ---------------------------------------------------- ZHS SQL> [/php]