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select
if (g.grade >= 8, s.name, NULL) as names,
g.grade,
s.marks
from students s
inner join grades as g
on s.marks <= g.max_mark and s.marks >= g.min_mark
order by g.grade desc, name asc, marks asc;
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select if (g.grade >= 8, s.name, NULL) as names, g.grade, s.marks from students s inner join grades as g on s.marks <= g.max_mark and s.marks >= g.min_mark order by g.grade desc, name asc, marks asc;