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  select * from dba_users;
  select * from all_users;
  select * from user_users;
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  select * from dba_sys_privs;
  select * from user_sys_privs;
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sql>select * from role_sys_privs;
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  select * from dba_tab_privs;
  select * from all_tab_privs;
  select * from user_tab_privs;
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  select * from dba_roles;
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  select * from dba_role_privs;
  select * from user_role_privs;
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select * from V$PWFILE_USERS
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select name from sys.system_privilege_map
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select privilege from dba_sys_privs where grantee='DATAUSER'  
union  
select privilege from dba_sys_privs where grantee in (select granted_role from dba_role_privs where grantee='DATAUSER' );   
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oracle create tablespace

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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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create table test(c_id   varchar2(20));
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insert into test values ('1234');
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