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SELECT (CASE WHEN Grades.Grade < 8 THEN 'NULL' ELSE Students.Name END ) , Grades.Grade, Students.Marks FROM Students
LEFT JOIN Grades
on Students.Marks BETWEEN Grades.Min_Mark AND Grades.Max_Mark
ORDER BY Grades.Grade DESC, Students.Name
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There is no ambiguity
SELECT (CASE WHEN Grades.Grade < 8 THEN 'NULL' ELSE Students.Name END ) , Grades.Grade, Students.Marks FROM Students LEFT JOIN Grades on Students.Marks BETWEEN Grades.Min_Mark AND Grades.Max_Mark ORDER BY Grades.Grade DESC, Students.Name