Oracle Table和View之间的主要区别是: 数据存储:Oracle Table是用于存储数据的结构化对象,可以包含多个列和行,存储实际的数据记录;而Oracle View是虚拟的表,不存储实际数据,只是基于一个或多个表的查询结果的可视化表示。 数据更新:Oracle Table可以直接进行数据的插入、更新、删除等操作;而Oracle View通常是只读的,不...
grant create session to test01; --默认用户没有任何表,而且不具备操作其他表的权限。 --select * from emp; --授权soctt.emp所有权限(all)给test01 grant all on scott.emp to test01; -回收权限 revoke all on scott.emp from test01; --分配创建表的权限 grant create table to test01; --此时tes...
新增记录INSERT INTO locations_view VALUES(999, 'Entertainment', 87, 'Roma'); 系统返回:ERROR at line 1: ORA-01776: cannot modify more than one base table through a join view 可以查询系统表USER_UPDATABLE_COLUMNS,查看连接视图中的列是否可更新。 SELECT column_name, updatable FROM user_updatable_...
Oracle CREATE VIEW examples Let’s look at some examples of creating new views based on the tables in the sample database. A) Creating a view example See the following employees table from the sample database. The following statement creates a view named employee_yos based on the employees ...
在Oracle中,可以使用CREATE VIEW语句来创建多表视图。下面是一个创建多表视图的示例: CREATE VIEW my_view AS SELECT a.column1, b.column2 FROM table1 a, table2 b WHERE a.column3 = b.column4; 复制代码 在上面的例子中,my_view是视图的名称,table1和table2是要连接的表。通过SELECT语句,我们可以在...
CREATE TABLE http://download.oracle.com/docs/cd/E11882_01/server.112/e17118/statements_7002.htm#SQLRF01402 表空间(tableSpace) 段(segment) 盘区(extent) 块(block) 关系 一. Storage 参数说明 1. INITIAL Specify the size of the first extent of the object. Oracle allocates spac...
在dbtest下创建物化视图T 创建物化视图日志: conn scott/tiger; create materialized view log on dept; grant select on MLOG$_DEPT to dbtest; 创建物化视图: conn dbtest/dbtest; create materialized view T on prebuilt table refresh fast on demand as select deptno,dname,loc,ACOLUMN from scott.dept...
select * from emp e1 right join emp e2 on e1.mgr = e2.empno; 6、full join on|using -->全连接 满足直接匹配,不满足 相互补充null ,确保 所有表的记录 都至少出现一次 select * from emp e1 full join emp e2 on e1.mgr = e2.empno; -- 两张表都作为主表 ...
create view test01 as select * from hr.employees; 报错ORA-01031,表明insufficient privileges (二)问题分析解决 (1)在ORACLE官方文档中用此条描述: ou must have been granted one of the following system privileges, either explicitly or through a role: ...
BONUS TABLE PK_EMP INDEX EMP TABLE DEPT TABLE PK_DEPT INDEX 7 rows selected. 创建只读视图 SQL> create view vw_emp_readonly as select empno,ename,job,hiredate,deptno from empwith read only; SQL> select * from vw_emp_readonly where deptno=10; ...