今日の勉強_2020/06/17

https://a5m2.mmatsubara.com/wp/?topic=%E3%83%97%E3%83%AD%E3%82%B7%E3%83%BC%E3%82%B8%E3%83%A3%E4%BD%9C%E6%88%90%E6%99%82%E3%81%AE%E3%83%87%E3%83%AA%E3%83%9F%E3%82%BF%E8%A8%AD%E5%AE%9A

http://pentan.info/sql/mysql/character_set.html