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sys;//ϵͳ¹ÜÀíÔ±£¬ÓµÓÐ×î¸ßȨÏÞ     
system;//±¾µØ¹ÜÀíÔ±£¬´Î¸ßȨÏÞ     
scott;//ÆÕͨÓû§£¬ÃÜÂëĬÈÏΪtiger,ĬÈÏδ½âËø  
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sqlplus conn / as sysdba;//µÇ½sysÕÊ»§     
sqlplus sys as sysdba;//ͬÉÏ     
sqlplus scott/tiger;//µÇ½ÆÕͨÓû§scott 
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create user zhangsan;//ÔÚ¹ÜÀíÔ±ÕÊ»§Ï£¬´´½¨Óû§zhangsan     
alert user scott identified by tiger;//ÐÞ¸ÄÃÜÂë 
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1¡¢Ä¬ÈÏµÄÆÕͨÓû§scottĬÈÏδ½âËø£¬²»ÄܽøÐÐÄǸöʹÓã¬Ð½¨µÄÓû§Ò²Ã»ÓÐÈκÎȨÏÞ£¬±ØÐëÊÚÓèȨÏÞ
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/*¹ÜÀíÔ±ÊÚȨ*/    
grant create session to zhangsan;//ÊÚÓèzhangsanÓû§´´½¨sessionµÄȨÏÞ£¬¼´µÇ½ȨÏÞ     
grant unlimited session to zhangsan;//ÊÚÓèzhangsanÓû§Ê¹Óñí¿Õ¼äµÄȨÏÞ     
grant create table to zhangsan;//ÊÚÓè´´½¨±íµÄȨÏÞ     
grant drop table to zhangsan;//ÊÚÓèɾ³ý±íµÄȨÏÞ     
grant insert table to zhangsan;//²åÈë±íµÄȨÏÞ     
grant update table to zhangsan;//Ð޸ıíµÄȨÏÞ     
grant all to public;//ÕâÌõ±È½ÏÖØÒª£¬ÊÚÓèËùÓÐȨÏÞ(all)¸øËùÓÐÓû§(public)   
2¡¢oralce¶ÔȨÏÞ¹ÜÀí±È½ÏÑϽ÷£¬ÆÕͨÓû§Ö®¼äÒ²ÊÇĬÈϲ»ÄÜ»¥Ïà·ÃÎʵģ¬ÐèÒª»¥ÏàÊÚȨ
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grant select on tablename to zhangsan;//ÊÚÓèzhangsanÓû§²é¿´Ö¸¶¨±íµÄȨÏÞ     
grant drop on tablename to zhangsan;//ÊÚÓèɾ³ý±íµÄȨÏÞ     
grant insert on tablename to zhangsan;//ÊÚÓè²åÈëµÄȨÏÞ     
grant update on tablename to zhangsan;//ÊÚÓèÐ޸ıíµÄȨÏÞ     
grant insert(id) on tablename to zhangsan;     
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A schema is a collection of database objects (used by a user.).
Schema objects are the logical structures that directly refer to the database’s data.
A user is a name defined in the database that can connect to and access objects.
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ORACLEÈçºÎ¸ù¾ÝITLÕÒµ½Ç°¾µÏñµÄ

SQL> select * from emp where sal=800;
EMPNO ENAME      JOB         MGR HIREDATE          SAL      COMM DEPTNO
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