ALTER TABLE `coursemanager_user_quizes` MODIFY `grade` DEC(5,2) NOT NULL DEFAULT 0;
ALTER TABLE `coursemanager_user_courses` MODIFY `grade` DEC(5,2) NOT NULL DEFAULT 0;
ALTER TABLE `coursemanager_user_lessons` MODIFY `grade` DEC(5,2) NOT NULL DEFAULT 0;
ALTER TABLE `coursemanager_lessons` MODIFY `grade` DEC(5,2) NOT NULL DEFAULT 0;
ALTER TABLE `coursemanager_courses` MODIFY `grade` DEC(5,2) NOT NULL DEFAULT 0;