11、查看表结构:desc all_tables; 12、显示CQI.T_BBS_XUSER的所有字段结构: desc CQI.T_BBS_XUSER; 13、获得CQI.T_BBS_XUSER表中的记录: select * from CQI.T_BBS_XUSER; 14、增加数据库用户:(test11/test) create user test11 identified by test default tablespace users Temporary TABLESPACE Temp; 15、用户授权: grant connect,resource,dba to test11; grant sysdba to test11; commit; 16、更改数据库用户的密码:(将sys与system的密码改为test.) alter user sys indentified by test; alter user system indentified by test;