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varchar和Nvarchar区别
varchar(n) 长度为 n 个字节的可变长度且非 Unicode 的字符数据。n 必须是一个介于 1 和 8,000 之间的数值。存储大小为输入数据的字节的实际长度，而不是 n 个字节。 nvarchar(n) 包含 n 个字符的可变长度 Unicode 字符数据。n 的值必须介于 1 与 4,000 之间。字节的存储大小是所输入字符个数的两倍。 两字段分别有字段值：我和coffee 那么varchar字段占2×2+6=10个字节的存储空间，而nvarchar字段占8×2=16个字节的存储空间。 如字段值只是英文可选择varchar，而字段值存在较多的双字节（中文、韩文等）字符时用nvarchar
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vs2010 怎样设置文本编辑窗口和解决方案资源管理器同步？
不能上图，我就直接说了 工具--选项--项目和解决方案--常规--在解决方案资源管理器中跟踪活动项（前打勾） 确定 应该就可以了。
