二、INFORMIX ORACLES数据类型对应长度及比较 informix Oracle 范围 默认长度 作为数据存储 变量 char 1~32767 1 1~2000 1~32767 varchar 1~255 1 1~4000 1~

在informix中有如下几种对字符串操作的类型： char(character),varchar,nchar,nvarchar,lvarchar,text 在ORACLE中有如下几种对字符串操作的类型： char(character),varchar(varchar2),nchar,nvarchar2,long,long raw及LOB类型

一、基本概念： 1、字符存储单位 2、char:定长的字符串类型 3、varchar：描述变长字符串

三、字符比较： 1、char和varchar 2、char和nchar，varchar和nvarchar

四、oracle里的数据类型: 1、char,character,varchar,varchar2,nchar,nvarchar2的共同特点： 当插入空字符串时，则都会被转变为null

五、informix里的字符: 1、lvarchar在9.4版本之后才可以用带指定长度的方式，如lvarchar(3000)，不带长度则默认是2048字节，最大长度是32,739字节。 所以对于9.4之前的版本，不能用带长度的表达式，数据库会报语法错误。

六、oracle和informix表的限制 1、在informix的一个表中对以上字符串类型定义的总长度不能超过32767(不包括对大字段处理的text类型) 但是遇到varchar与nvarchar会再减1(为该列设置索引会留一位)，而遇到lvarchar则需要减3。 2、oracle限制的每个表的列的总数不能超过1000(此处没有测试),然后每个列的长度由其数据类型决定。 每个索引的最大列数 32

七、行迁移与行链接 当一行的数据过长而不能插入一个单个数据块中时，可能发生两种事情：行链接(row chaining)或行迁移(row migration)。

八、ORACLE－在设计数据库时如何选择正确的数据类型

The finishing off of the encircled enemy army is to be left to the Luftwaffe.

The strength of a nation derives from the integrity of the home.

I definitely see myself as a leader. One of the ways I've been lucky enough to lead and likely to continue to lead is just my actions and the way that I approach the game and working hard and being a player that steps up in big-time situations when plays need to be made.

A lot of my poems either have historical sequences or other kinds of chronological grids where I'm locating myself in time. I like to feel oriented, and I like to orient the reader at the beginning of a poem.

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Susan B. Anthony must be turning in her grave if she knew that millions of women who have the right to vote are not exercising it. Why? Because they haven't got the interest or the time, or they have just given up hope.

We have two tractor-trailer rigs on the Tour. One is a therapy truck, and one is a workout truck. If everything is going well, you're walking in the workout truck, and when things aren't going well, you're walking in the therapy truck.

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About 10 years ago, in an effort to gain a better grasp on McCone's world, I took up the hobby of building fully electrified scale models: first of the legal cooperative where she started out, and then of her own brown-shingled cottage, a pursuit that the more tactful of my friends label unusual, and that the more blunt refer to as obsessive.

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I've always been a jeans and t-shirt kind of guy.