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.`" , `COLUMNS` .table_name , "` CHANGE `" , column_name , "` `" , column_name , "` " , data_type , "(" , character_maximum_length , ") CHARACTER SET utf8mb4 COLLATE utf8mb4 _ bin" , IF ( is_nullable = "YES" , " NULL" , " NOT NULL" ) , ";" ) AS _sql FROM `COLUMNS` INNER JOIN `TABLES` ON `TABLES` .table_name = `COLUMNS` .table_name WHERE `COLUMNS` .table_schema like "name _ of _ your _ db" and data_type in ( 'varchar' , 'char' ) AND TABLE_TYPE = 'BASE TABLE' UNION SELECT CONCAT ( "ALTER...