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mysql-MYSQL建表字段问题 10101010

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Release： 2016-06-06 09:42:16
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mysql字段char数据库

想请问下：MYSQL建立一个表的字段假如是用来存储用户名的，那这个字段要用什么的比较好，我用阿里云的MYSQL，他死活不让我建，好像是字段长度问题；
有个问题就是假如我用CHAR类型，然后长度设置30，那么用户注册的话用户名只有20，注册成功了之后下次登录会不会查询不到用户名呢？我看百度说如果不足设置的长度，会自己填充进去那查询会不会出错呢，求大哥哥讲讲

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mysql 字段 char 数据库
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