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SELECT
CASE
WHEN g.Grade < 8 THEN NULL
ELSE s.Name
END AS NAME,
g.Grade, s.Marks
FROM Students s
JOIN Grades ON s.Marks BETWEEN g.Min_Mark AND g.Mark_Mark
ORDER BY
g.Grade DESC,
CASE
WHEN g.Grade >= 8 THEN s.Name
ELSE NULL
END ASC,
CASE
WHEN g.Grade < 8 THEN s.Marks
ELSE NULL
END ASC;
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SELECT CASE WHEN g.Grade < 8 THEN NULL ELSE s.Name END AS NAME, g.Grade, s.Marks FROM Students s JOIN Grades ON s.Marks BETWEEN g.Min_Mark AND g.Mark_Mark ORDER BY g.Grade DESC, CASE WHEN g.Grade >= 8 THEN s.Name ELSE NULL END ASC, CASE WHEN g.Grade < 8 THEN s.Marks ELSE NULL END ASC;