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HomeDatabaseMysql TutorialSQLServer中的N是什么意思?

USE master; GO SELECT OBJECT_ID( N 'AdventureWorks.Production.WorkOrder') AS 'Object ID'; GO 红色的 N 是 什么 意思? 加上 N 代表存入数据库时以 Unicode 格式存储。 N 'string' 表示string是个Unicode字符串 Unicode 字符串的格式与普通字符串相似,

USE master;
GO
SELECT OBJECT_ID(N 'AdventureWorks.Production.WorkOrder') AS 'Object ID';
GO

红色的N什么 意思?

 

加上 N 代表存入数据库时以 Unicode 格式存储。
N 'string' 表示string是个Unicode字符串

Unicode 字符串的格式与普通字符串相似,但它前面 一个 N 标识符(N 代表 SQL-92 标准中的国际语言 (National Language))。N 前缀必须是大写字母。例如,'Michél' 是字符串常量而 N 'Michél' 则是 Unicode 常量。Unicode 常量被解释为 Unicode 数据,并且不使 代码页进行计算。Unicode 常量确实 排序规则,主要 于控制比较和区分大小写。为 Unicode 常量指派当前数据库的默认排序规则,除非使 COLLATE 子句为其指定了排序规则。Unicode 数据中的每个字符都使 两个字节进行存储,而字符数据中的每个字符则都使 一个字节进行存储。 关更多信息,请参见使 Unicode 数据。

Unicode 字符串常量支持增强的排序规则。

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