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SELECT
CASE
WHEN G.Grade > 7 THEN S.Name
ELSE 'NULL'
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,
CASE
WHEN G.Grade > 7 THEN S.Name
ELSE S.Marks
END ASC
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SELECT CASE WHEN G.Grade > 7 THEN S.Name ELSE 'NULL' 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, CASE WHEN G.Grade > 7 THEN S.Name ELSE S.Marks END ASC