ORACLE SQL优化 ORACLE执行计划
Last login: Mon Feb 8 14:13:19 2010 from 192.168.1.249
ipnet
-bash-3.00$
-bash-3.00$ ipnet
-bash: ipnet: command not found
-bash-3.00$ su - oracle
Password:
eastcsu: incorrect password
-bash-3.00$ eastcom
-bash: eastcom: command not found
-bash-3.00$ su - oracle
Password:
[oracle@ipnet-td2 ~]$
[oracle@ipnet-td2 ~]$ sqlplus /nolog
SQL*Plus: Release 10.2.0.1.0 - Production on Mon Feb 8 14:14:08 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> su^H^H^H
SP2-0042: unknown command " - rest of line ignored.
SQL> conn ipnet/ipnet1234@ORAC^H^H^H
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
SQL> ^[[A^H " - rest of line ignored.
SQL> 042: unknown command "
SQL> conn ipnet/ipnet1234@ORCL
Connected.
SQL> set timn^H
SP2-0158: unknown SET option "tim"
SQL> set timing on
SQL> set autot traceonly
SQL> select v.NAME_CN from vendor v, vendordevicetype vt, devicetype t where t.name = vt.device_type_name and v.name = vt.vendor_name and t.name_cn = '防火墙';
Elapsed: 00:00:00.01
Execution Plan
----------------------------------------------------------
Plan hash value: 497066359
--------------------------------------------------------------------------------
------------------
| Id | Operation | Name | Rows | Bytes | Cost
(%CPU)| Time |
--------------------------------------------------------------------------------
------------------
| 0 | SELECT STATEMENT | | &n
相关文档：
今天同事遇到了一个问题，原因是rownum的问题。
下面转一篇文章：
对于Oracle的rownum问题，很多资料都说不支持>，>=，=，between……and，只能用以上符号（<、& lt;=、！=），并非说用>，>=，=，between……and 时会提示SQL语法错误，而是经常是查不出一条记录来，还会出现� ......
应一个朋友的要求，贴上收藏的SQL常用分页的办法～～
表中主键必须为标识列，[ID] int IDENTITY (1,1)
1.分页方案一：(利用Not In和SELECT TOP分页)
语句形式：
SELECT TOP 页记录数量 *
from 表名
WHERE (ID NOT IN
(SELECT TOP (每页行数*(页数-1)) ID
from 表名
ORDER BY ......
问题描述：
有表tb, 如下:
id values
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
欲按,分拆values列, 分拆后结果如下:
id& ......
表中主键必须为标识列，[ID] int IDENTITY (1,1)
1.分页方案一：(利用Not In和SELECT TOP分页)
语句形式：
SELECT TOP 页记录数量 *
from 表名
WHERE (ID NOT IN
(SELECT TOP (每页行数*(页数-1)) ID
from 表名
ORDER BY ID))
ORDER BY ID
//自己还可以加上一些查询条件
例:
select top 2 ......
