/*Variant 1*/

SELECT Students.Name, Grades.Grade, Students.Marks FROM Students INNER JOIN Grades ON Students.Marks BETWEEN Grades.Min_Mark AND Max_Mark WHERE Grades.Grade > 7 ORDER BY Grades.Grade DESC, Students.Name ASC;
SELECT null, Grades.Grade, Students.Marks FROM Students INNER JOIN Grades ON Students.Marks BETWEEN Grades.Min_Mark AND Max_Mark WHERE Grades.Grade <= 7 ORDER BY Grades.Grade DESC, Students.Marks ASC;

/*Variant 2*/

SELECT IF (Grades.Grade > 7, Students.Name, NULL) AS Sname, Grades.Grade, Students.Marks FROM Students 
INNER JOIN Grades ON Students.Marks BETWEEN Grades.Min_Mark AND Max_Mark
ORDER BY Grades.Grade DESC, Sname ASC, Students.Marks ASC;
/* Variant 3*/
SELECT 
    CASE
        WHEN Grades.Grade > 7
        THEN Students.Name
        WHEN Grades.Grade <= 7
        THEN NULL
    END, Grades.Grade, Students.Marks FROM Students INNER JOIN Grades ON Students.Marks BETWEEN Grades.Min_Mark AND Max_Mark ORDER BY Grades.Grade DESC, Students.Name ASC, Students.Marks ASC;