Oracle 连接 复习
SQL> select * from ta;
ID NAME
---------- --------------------
1 gorey
2 gorey2
SQL> select * from tb;
ID ADDRESS
---------- --------------------
2 g2
3 g3
SQL>
●左外连接 -》 左表记录全部选中，右表匹配选中 ，未匹配的情况NULL显示
SQL> select * from ta left outer join tb on ta.id = tb.id;
ID NAME ID ADDRESS
---------- -------------------- ---------- --------------------
1 gorey
2 gorey2 2 g2
SQL> select * from ta left join tb on ta.id = tb.id;
ID NAME ID ADDRESS
---------- -------------------- ---------- --------------------
1 gorey
2 gorey2 2 g2
SQL> select * from ta,tb where ta.id = tb.id(+);
ID NAME ID ADDRESS
---------- ------------
相关文档：
Oracle Flashback Technology
Oracle Flashback Technology reduces recovery time from hours to minutes.
from: http://www.oracle.com/technology/deploy/availability/htdocs/Flashback_Overview.htm
According to many studies, 40% of application outages are caused by operator or user errors. Part of be ......
基本要求
win 7的版本是旗舰版，oracle 10g（Oracle10g第2版10.2.0.3-10.2.0.410203vistaw2k8x86productiondb）迅雷有下载
（搜索“oracle 10g vista”，760MB）
具体过程
1.配置一个虚拟的IP：在安装ORACLE 10g前系统会检测安装的一些前提条件是否满足，
往往会提示说：将Microsoft LoopBack Adapter配置为 ......
本人以前整理的数据库文件迁移过程，希望能够对大家有所帮助
1、sqlplus "sys/sys@服务名 as sysdba"
2、修改控制文件:
alter system set control_files='E:\oracle\oradata\myOracle_1\control01.ctl',
'E:\oracle\oradata\myOracle_1\control02.ctl','E:\oracle\oradata\my ......
在linux下启动oracle 和在windows是有差别的，对于一般在windows下操作习惯人有很多不适应，所以我特别写这样文章，以方便新手进行操作，下面就一步一步讲解启动过程。
1.通过终端连接到linux服务器,当然这样的软件很多例如putty,SecureCRT,并以oracle用户进行登录，否则启动oracle时会错的，没有权限启动.(也可用户root � ......
SELECT EXECUTIONS , DISK_READS, BUFFER_GETS,
ROUND((BUFFER_GETS-DISK_READS)/BUFFER_GETS,2) Hit_radio,
ROUND(DISK_READS/EXECUTIONS,2) Reads_per_run,
SQL_TEXT
from V$SQLAREA
WHERE EXECUTIONS>0
AND BUFFER_GETS > 0
AND (BUFFER_GETS-DISK_READS)/BUFFER_GETS ......
