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character encoding - How to convert an entire MySQL database characterset and collation to UTF-8? - Stack Overflow
https://stackoverflow.com/questions/6115612/how-to-convert-an-entire-mysql-database-characterset-and-collation-to-utf-8
テーブル全体で弄りたいならカラムごとの指定は必要なさそう
Stack OverflowHow to convert an entire MySQL database characterset and collation to UTF-8?How can I convert entire MySQL database character-set to UTF-8 and collation to UTF-8?