MySQL matching unicode characters with ascii version(MySQL 匹配 unicode 字符与 ascii 版本)
How do I remove extended ASCII characters from a string in T-SQL?(如何从 T-SQL 中的字符串中删除扩展的 ASCII 字符?)
Finding and removing Non-ASCII characters from an Oracle Varchar2(从 Oracle Varchar2 中查找和删除非 ASCII 字符)