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SELECT
CASE
WHEN Marks >= 70 THEN Name
ELSE 'NULL'
END
,
(SELECT GRADE FROM GRADES
WHERE Marks BETWEEN Min_Mark AND Max_Mark
) AS gr,
Marks
FROM Students
ORDER BY gr DESC , Name
go
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Without Using Join
SELECT CASE WHEN Marks >= 70 THEN Name ELSE 'NULL' END , (SELECT GRADE FROM GRADES WHERE Marks BETWEEN Min_Mark AND Max_Mark ) AS gr, Marks FROM Students ORDER BY gr DESC , Name
go