change character set
ALTER SCHEMA `employees` DEFAULT CHARACTER SET utf8mb4 DEFAULT COLLATE utf8mb4_general_ci ;
ALTER TABLE `employees`.`t2` CHARACTER SET = utf8mb4 , COLLATE = utf8mb4_general_ci ;
ALTER SCHEMA `employees` DEFAULT CHARACTER SET utf8mb4 DEFAULT COLLATE utf8mb4_general_ci ;
ALTER TABLE `employees`.`t2` CHARACTER SET = utf8mb4 , COLLATE = utf8mb4_general_ci ;
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