SELECT CONCAT( 'ALTER TABLE `', t.`TABLE_SCHEMA` , '`.`', t.`TABLE_NAME` , '` CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;' ) AS sqlcode
FROM `information_schema`.`TABLES` t
WHERE 1
AND t.`TABLE_SCHEMA` = 'ИМЯ_БАЗЫ'
ORDER BY 1
LIMIT 0 , 90

ALTER TABLE `ВАША_БАЗА`.`administrators` CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;
ALTER TABLE `ВАША_БАЗА`.`admin_access` CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;