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SELECT
CASE
WHEN G.GRADE >= 8 THEN S.NAME
ELSE NULL
END AS NAME,
G.GRADE,
S.MARKS
FROM STUDENTS S
JOIN GRADES G
ON S.MARKS BETWEEN G.MIN_MARK AND G.MAX_MARK
ORDER BY
G.GRADE DESC,
CASE
WHEN G.GRADE >= 8 THEN S.NAME
END ASC,
CASE
WHEN G.GRADE < 8 THEN S.MARKS
END ASC;
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SELECT CASE WHEN G.GRADE >= 8 THEN S.NAME ELSE NULL END AS NAME, G.GRADE, S.MARKS FROM STUDENTS S JOIN GRADES G ON S.MARKS BETWEEN G.MIN_MARK AND G.MAX_MARK ORDER BY G.GRADE DESC, CASE WHEN G.GRADE >= 8 THEN S.NAME END ASC, CASE WHEN G.GRADE < 8 THEN S.MARKS END ASC;