ORACLE使用EXCEPTIONS表查询出表中重复记录
SQL> conn system/oracle
Connected.
SQL> create table scott.t1(id number primary key,name varchar2(10)); --创建测试表
Table created.
SQL> select constraint_name,table_name,constraint_type, --查看相应完整性约束的状态
2 status,deferrable,deferred,validated
3 from dba_constraints
4 where owner='SCOTT' and table_name='T1';
CONSTRAINT_NAME TABLE_NAME C STATUS
------------------------------ ------------------------------ - --------
DEFERRABLE DEFERRED VALIDATED
-------------- --------- -------------
SYS_C0023319 T1 P ENABLED
NOT DEFERRABLE IMMEDIATE VALIDATED
SQL> insert into scott.t1 values(1,'tt');
1 row created.
SQL> insert into scott.t1 values(1,'hh'); --插入id列重复的记录失败
insert into scott.t1 values(1,'hh')
*
ERROR at line 1:
ORA-00001: unique constraint (SCOTT.SYS_C0023319) violated
SQL> alter table scott.t1 disable novalidate constraint SYS_C0023319; --修改约束状态
Table altered.
SQL> select constraint_name,table_name,constraint_type, --查看相应完整性约束的状态
2 status,deferrable,deferred,validated
3 from dba_constraints
4 where owner='SCOTT' and table_name='T1';
CONSTRAINT_NAME TABLE_NAME C STATUS
--------
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oracle表空间操作详解
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3作者： 来源： 更新日期：2006-01-04
5
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7建立表空间
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9CREATE TABLESPACE data01
10DATAFILE '/ora ......
我先抛砖引玉:
1. 开发性: SQLSERVER不能,ORACLE能装在UNIX上
2. 分区表: SQLSERVER不� ......
--首先检查数据库中是否有CTXSYS用户和CTXAPP脚色。
--如果没有这个用户和角色，意味着你的数据库创建时未安装intermedia功能。
--你必须修改数据库以安装这项功能。
--用sys用户为了用户gzinfo分配权限
grant
CTXAPP
to
gzinfo;
grant
execute
on
ctx_ddl
to
......
sql语句如下:
select * from userdb40.numservice where ServiceNumber =88880068
and applytime <= to_date('2009-12-26 10:41:44','yyyy-MM-dd HH24:mi:ss')
select to_date('2007-06-28 19:51:20.0','yyyy-MM-dd HH24:mi:ss') from dual; ......
比较官方的说法
Full
A backup of a datafile that includes every allocated block in the file being backed up. A full backup of a datafile can be an image copy, in which case every data block is backed up. It can also be stored in a backup set, in which case datafile blocks not in use may be skipped, ......
