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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;