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select (Case when g.grade>7 then s.name else null end) Name, g.grade Grade, s.marks Marks from
students s
left join
grades g on (s.marks >= g.min_mark and s.marks <= g.max_mark) order by Grade Desc, Name, marks;
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select (Case when g.grade>7 then s.name else null end) Name, g.grade Grade, s.marks Marks from students s left join grades g on (s.marks >= g.min_mark and s.marks <= g.max_mark) order by Grade Desc, Name, marks;