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select
CASE
WHEN g.Grade < 8 THEN "NULL"
ELSE s.Name
END,
g.Grade,
s.Marks
FROM Students as s
join Grades as g
on s.Marks BETWEEN g.Min_Mark AND g.Max_Mark
order by g.Grade desc,
CASE
WHEN g.Grade < 8 THEN s.Marks
ELSE s.Name
END asc
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select CASE WHEN g.Grade < 8 THEN "NULL" ELSE s.Name END, g.Grade, s.Marks FROM Students as s join Grades as g on s.Marks BETWEEN g.Min_Mark AND g.Max_Mark order by g.Grade desc, CASE WHEN g.Grade < 8 THEN s.Marks ELSE s.Name END asc