student INT CONSTRAINT FK_GRADES_Students FOREIGN KEY REFERENCES Students(student_id), lesson BIGINT CONSTRAINT FK_GRADES_Shedule FOREIGN KEY REFERENCES Shedule(lesson_id), ...
CONSTRAINT FK_DDR_Discipline FOREIGN KEY (discipline) REFERENCES Disciplines(discipline_id), CONSTRAINT FK_DDR_Direction FOREIGN KEY (direction) REFERENCES Directions(direction_id) CONSTRAINT ...