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SQL SEVER:
SELECT IIF(G.GRADE >= 8, S.NAME, 'NULL'), G.GRADE, S.MARKS
FROM STUDENTS S
JOIN GRADES G ON (S.MARKS <= G.MAX_MARK) AND (S.MARKS >= G.MIN_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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SQL SEVER: SELECT IIF(G.GRADE >= 8, S.NAME, 'NULL'), G.GRADE, S.MARKS FROM STUDENTS S JOIN GRADES G ON (S.MARKS <= G.MAX_MARK) AND (S.MARKS >= G.MIN_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