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select CASE
WHEN g.grade < 8 THEN null
ELSE s.name
END, g.grade, s.marks
from students s
left join grades g
on s.marks between g.min_mark and g.max_mark
order by g.grade desc, s.name
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select CASE WHEN g.grade < 8 THEN null ELSE s.name END, g.grade, s.marks from students s left join grades g on s.marks between g.min_mark and g.max_mark
order by g.grade desc, s.name