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with students(name, marks) as ( select 'A', 70 from dual union all select 'B', 8 from dual union all select 'C', 10 from dual ), grades (grade, min_mark, max_mark) as ( select 1, 0, 12 from dual union all select 7, 70, 79 from dual union all select 6, 60, 69 from dual ) select name, grade, marks from ( SELECT name, grade, marks FROM students, grades WHERE min_mark <= marks AND marks <= max_mark AND marks >= 70 UNION SELECT TO_CHAR('NULL') AS name, grade, marks FROM students, grades WHERE min_mark <= marks AND marks <= max_mark AND marks <= 69 ) order by grade desc,case when grade >= 8 then name when grade < 8 then to_char(marks, 'FM000') end ;
NAME
GRADE
MARKS
A
7
70
NULL
1
8
NULL
1
10