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select (case when grade < 8 then null else name end) name, grade, marks from students , grades where marks between min_mark and max_mark order by grade desc, name, decode(name,NULL,marks);
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another solution:****
select (case when grade < 8 then null else name end) name, grade, marks from students , grades where marks between min_mark and max_mark order by grade desc, name, decode(name,NULL,marks);