oracle列转行方法总结
方法一：
----------------------------------------------------------------
---Muti-row to line(col2row)
----------------------------------------------------------------
create or replace type str_tab is table of varchar2(20);
/
grant all on str_tab to public;
create public synonym str_tab for str_tab;
create or replace function col2row(pv in str_tab) return varchar2
is
ls varchar2(4000);
begin
for i in 1..pv.count loop
ls := ls || pv(i);
end loop;
return ls;
end;
/
grant execute on col2row to public;
create public synonym col2row for col2row;
----------------------------------------------------------------
--multi column,convert one column base on another column, for example
----------------------------------------------------------------
create table t(id number,name varchar2(10));
insert into t values(1,'Joan');
insert into t values(1,'Jack');
insert into t values(1,'Tom');
insert into t values(2,'Rose');
insert into t values(2,'Jenny');
---------------------------------------------------------------
SQL(c3dev)>select * from t;
ID NAME
---------- ----------
1 Joan
1 Jack
1 Tom
2 Rose
2 Jenny
---------------------------
--column to row
---------------------------
SQL(c3dev)>column names format a80;
SQL(c3dev)>set line 120
SQL(c3dev)>select t0.id,
2 col2row(cast(multiset(select name from t where t.id = t0.id) as str_tab)) names
3 from (select distinct id from t) t0;
ID NAMES
---------- --------------------------------------------------------------------------------
&nbs
相关文档：
http://hi.baidu.com/fyears/blog/item/5ef68ac3feb9a45db219a836.html
select object_id,session_id,locked_mode from v$locked_object;
select t2.username,t2.sid,t2.serial#,t2.logon_time
from v$locked_object t1,v$session t2
where t1.session_id=t2.sid order by t2.logon_time;
alter system ki ......
package cn.edu.bit.test;
import java.sql.*;
public class Jdbc {
public static void main(String[] args)
{
try{
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
System.out.p ......
今天看到一篇关于ORA_ROWSCN的文章，虽然简短，没有什么实例，但是已经把ORA_ROWSCN大概是怎么回事介绍清楚了。记录一下。
=================================================================================
默认的情况下，每个块中所有的记录的ORA_ROWSCN都是相同的，当块中任意一条记录发生改变的情况下，块中所有� ......
在SQL语句优化过程中，我们经常会用到hint,现总结一下在SQL优化过程中常见Oracle HINT的用法：
1. /*+ALL_ROWS*/
表明对语句块选择基于开销的优化方法,并获得最佳吞吐量,使资源消耗最小化.
例如:
SELECT /*+ALL+_ROWS*/ EMP_NO,EMP_NAM,DAT_IN from BSEMPMS WHERE EMP_NO='SCOTT';
2. /*+FIRST_ROWS*/
表 ......
使用的是ADODB库,需要有OCI8库.
<?php
//require("adodb5/adodb-exceptions.inc.php");
require("adodb5/adodb.inc.php");
$conn = NewADOConnection("oci8");
$conn->Connect($url, $user, $password, $service_name);
$rs;
try {
$rs = $conn->Execu ......
