SQL

SQL alter/convert

• таблицу и поля в кодировки

ALTER TABLE `DATABASE`.`TABLE` CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;

• базу, таблицы, поля в кодировки

ALTER DATABASE `DATABASE` DEFAULT CHARSET=utf8 COLLATE utf8_bin;

https://stackoverflow.com/questions/6115612/how-to-convert-an-entire-mysql-database-characterset-and-collation-to-utf-8#6115705

Use the ALTER DATABASE and ALTER TABLE commands.

ALTER DATABASE databasename CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE tablename CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

Or if you're still on MySQL 5.5.2 or older which didn't support 4-byte UTF-8, use utf8 instead of utf8mb4:

ALTER DATABASE databasename CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE tablename CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;