sql函数学习1
用户解锁 重设密码alter user hr account unlock;alter user hr identified by hr;sql语句转义SQL> select employee_id,job_id,salary 2 from employees 3 where job_id like...
sql*loader试验小记2 direct path load
要导入的表必须已存在,sqlldr不能创建表,sqlldr导入已经存的表,此表可以为空也可以有数据。在要操作的表上要有Insert,delete权限,用replace、truncate命令清空旧数据。前期准备:在direct pathload要...
sql*loader试验小记1
1.首先我们来建个表,用来接数据SQL> create table test( 2 id number, 3 name char);Table created.SQL> select * from test;no rows selectedSQL> !2...
informix数据--导入和导出
1.首先登陆dbaccess2.使用ftp命令,把数据上传到根目录E:\>ftp xx.x.x.xx(host-IP)Connected to xx.x.x.xx.220 mc-nms-v4 FTP server (SunOS 5.8) ready.User (xx.x.x.xx:(none)): informix331 Password req...
perl学习笔记3
关于括号() sub weight{ ($weight)=@_; #这里()是个列表,把默认数组中的第一...
perl学习笔记2
正则表达式+用于使前面的字符与后面的字符至少匹配一次,也可任意次的匹配例:/do+g/ dog dooooog *使前面的字符可以进行0次或多次匹配例:/car*t/ carted cat...
perl学习笔记1
@string=qw(7 6 5 4);print join('',sort @string);print"\n"; @string2=qw(a b c A B C);print join('',sort @string2); 4567ABCabc 字母按ASCII排,数字也会按升序排...
CentOS4.x安装9.2.0.4出现的小问题
屡试不爽的安装今天终于出问题了[oracle@oracle9i Disk1]$ ./runInstaller [oracle@oracle9i Disk1]$ Initializing Java Virtual Machine from /tmp/OraInstall2009-02-09_11-26-06PM/jre/bin/...
WHAT ARE RECURSIVE CALLS?
In Oracle, a recursive call is a call, for example, that must be completed before the user's SQL can be completed. Say you wanted to order a pizza for delivery. You make one call, place your ...
checkpoint queue
8i开始,出现了checkpoint queue 。checkpoint queue 是按照buffer的 low RBA 排序的,也就是说按照buffer 第一次发生变化的时候的时间点排序的,这样dbwr根据checkpoint queue...
[转载]Oracle关联加号(+)等相关知识
假设有 a表 id 1 2 3 4 b表 id 1 2 3 希望出来结果 a.id b.id 1 1 2 2 3 3 4 用left join 的SQL codeselect a...
sqlplus设置列宽
设置列宽和长度SQL> set linesize 300SQL> set pagesize 100将所有列的显示属性设为缺省值 SQL> CLEAR COLUMNS