数据库技术
aterialized views are disk based and update
periodically base upon the query definition.Views are virtual only and run the
query definition each time ...
table 1:+----+---------+| id | content
|+----+---------+| 1 | num1 || 2 | num2 || 3 | num3 || 4 | num4 || 5 | num5
|+----+---------+table 2:+---------...
Question: I added an index hint in my query,
but the hint is being ignored. What is the correct syntax for an index hint and
how do I force the index ...
http://www.codeproject.com/Articles/33052/Visual-Representation-of-SQL-Joins
Question:I have a SQL with multiple columns in
my where clause. I know that Oracle can only choose one index, and I know about
multi-column composite ...
pdb是调试程序必不可少的东西,它保存着一个exe或dll的调试信息,对pdb进行源码索引可以快速找到软件对应该版本的代码,本文以subversion版本控制服务器进行介绍一、需要安装的软件windbg,在ddk安装包中可找到TortoiseSVN,安装时要选上命令行工具ActivePerl
三个工...
1、创建目录对象因为使用expdp命令需要使用到目录对象(directory),所以首先需要创建目录对象,并赋予某个用户对目录对象的操作权限.dbserver->
sqlplus / as sysdbaSQL*Plus: Release 11.2.0.3.0 Production on Sat Ma...
官网上说明使用NDBAPI开发的效率是用SQL命令的三倍左右。抽空写了一些关于使用NDBCAPI开发的简单指导,此文档可以帮助你进行开发入门了解。具体的文档内容请见附件。希望大家看后,能有所收获。
简单记录下:1.使用excutedbms_file_transfer.copyfile()2.rman的backupbackupsetxto‘’;3.oracle安装xdb有个ftp功能$ORACLE_HOME/rdbms/admin/catxdbdbca.sql77778888没测试过1和2结果都一样,md5值都一样的
级联更新第1种情况:updatet1,t2sett1.x=t2.x,t1.y=t2.ywheret1.id=t2.id级联更新第2种情况:updatet1,(select*fromt2)ast2sett1.x=t2.x,t1.y=t2.ywheret1.id=t2.id级联更新第3种情况:update(selectcfromt1groupbyc)astemp,t2,t1sett1.x=t2.x,t1.y=t2.ywheret1.id=t2.idandtem..