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oracle
select name,(select grade from grades g where s.marks between g.min_mark and g.max_mark) Grade, marks from students s
where (select grade from grades g where s.marks between g.min_mark and g.max_mark) >= 8
union
select null,(select grade from grades g where s.marks between g.min_mark and g.max_mark) Grade, marks from students s
where (select grade from grades g where s.marks between g.min_mark and g.max_mark) < 8
order by grade desc, name, marks ;
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oracle select name,(select grade from grades g where s.marks between g.min_mark and g.max_mark) Grade, marks from students s where (select grade from grades g where s.marks between g.min_mark and g.max_mark) >= 8 union select null,(select grade from grades g where s.marks between g.min_mark and g.max_mark) Grade, marks from students s where (select grade from grades g where s.marks between g.min_mark and g.max_mark) < 8 order by grade desc, name, marks ;