OracleSQL内置函数大全之三

57.UID

返回标识当前用户的唯一整数

SQL> show user

USER 为"GAO"

SQL> select username,user_id from dba_users where user_id=uid;

USERNAME                         USER_ID

------------------------------ ---------

GAO                                   25

58.USER

返回当前用户的名字

SQL> select user from  dual;

USER

------------------------------

GAO

59.USEREVN

返回当前用户环境的信息,opt可以是:

ENTRYID,SESSIONID,TERMINAL,ISDBA,LABLE,LANGUAGE,CLIENT_INFO,LANG,VSIZE

ISDBA  查看当前用户是否是DBA如果是则返回true

SQL> select userenv('isdba') from dual;

USEREN

------

FALSE

SQL> select userenv('isdba') from dual;

USEREN

------

TRUE

SESSION

返回会话标志

SQL> select userenv('sessionid') from dual;

USERENV('SESSIONID')

--------------------

152

ENTRYID

返回会话人口标志