[Err] 1071 - Specified key was too long; max key length is 1000 bytes

1071 - Specified key was too long; max key length is 1000 bytes 是一个错误信息，表示指定的键太长，最大键长度为1000个字节。这个错误通常发生在数据库中创建唯一键时，当键的长度超过了数据库所允许的最大长度时会出现该错误。引用提到了这个错误信息，并且指出是在尝试为`users`表添加一个唯一键(`users_username_unique`)时出现的。MySQL 5.7版本中，varchar的长度是根据字符数来计算的，一个字母或汉字都算作一个字符。因此，当键的长度超过1000个字节时，就会出现这个错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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