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SELECT NUllif(s.name,g.grade > 7), 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 asc;
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SELECT NUllif(s.name,g.grade > 7), 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 asc;