(参考:OracleDBA面试题) 第十二章DDL(改变表结构) 12.1v创建表 Createtablestudent( Sidnumber(lO), Snamevarchar2(10) )tablespacett; 以上tablespace不是必须的。默认不写,则创建在登录的用户所在的表空间上 12.2、使用子查询创建表 createtablemyempasselectfromemp; createtablemyempasselectfromempwheredeptno=10...
DBS:DBMS\DB\DBA 1.1.4 数据库系统的模式结构 数据库系统的结构由内部级、概念级、外部级三级模式组成。 1、内部级模式(内模式):最靠近物理存储器,是数据在数据库系统中的表示(即对数据的物理 结构和存 储方式的描述) ,是物理数据模型对数据的描述。 2、概念级模式(模式) :间于上述两者之间。它又称为逻辑...
[IT/计算机]Oracle10gDba1-041官方教材_141br/br/oracle database 10g: administration workshop ibr/student guidebr/br/d17090gc10 edition 1.0 march 2004 d39126br/br/®br/br/authors ric van dyke russ lowenthal technical contributors and reviewers donna keesling s. matt taylor jean-francois verri...
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USER_GRANTS Set this directive to 1 if you connect the Oracle database as simple user and do not have enough grants to extract things from the DBA_... tables. It will use tables ALL_... instead. Warning: if you use export type GRANT, you must set this configuration option to 0 or...