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    ÆäÖÐorclΪÊý¾Ý¿âµÄ·þÎñÃû»òÕßSID£¬oradim -startup -sid orclÕâ¸öÃüÁîÒÔÇ°×Ô¼ºÃ»Óùý
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create user zhangsan identified by zhangsan;
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    select *  from user_sys_privs;---²éѯµ±Ç°µÇ½Óû§µÄϵͳȨÏÞ
    revoke create table from lisi;
    revoke unlimited tablespace  from lisi;
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    grant select on tablename to lisi;
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select * from user_tab_privs;---²éѯµ±Ç°µÇ½Óû§µÄ¶ÔÏóȨÏÞ
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    grant update(name) on mytab to lisi; 
    grant insert(id) on mytab to lisi;
    update wangwu.mytab set name='songyakun',id=1 where id=2;
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    grant alter any table to lisi;
    grant alter any table to lisi with admin option;
    grant select on A to lisi with grant option;
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    grant alter any table to wangwu;
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    create role myrole;
    grant create session to myrole;
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