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Developer-C 11.1
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CREATE TABLE table_name (studentNo, courseNo) AS SELECT 's001', 'c001' FROM DUAL UNION ALL SELECT 's001', 'c002' FROM DUAL UNION ALL SELECT 's002', 'c001' FROM DUAL UNION ALL SELECT 's002', 'c002' FROM DUAL UNION ALL SELECT 's003', 'c001' FROM DUAL UNION ALL SELECT 's003', 'c003' FROM DUAL UNION ALL SELECT 's004', 'c002' FROM DUAL UNION ALL SELECT 's004', 'c001' FROM DUAL UNION ALL SELECT 's004', 'c003' FROM DUAL UNION ALL SELECT 's005', 'c001' FROM DUAL
10 rows affected
WITH course_count (studentno, courseno, num_courses) AS ( SELECT t.*, COUNT(courseNo) OVER (PARTITION BY studentno) FROM table_name t ) SELECT c.studentno FROM course_count c INNER JOIN course_count s ON ( c.courseno = s.courseno AND c.studentno != s.studentno AND c.num_courses = s.num_courses ) WHERE s.studentno = 's001' GROUP BY c.studentno HAVING COUNT(c.courseno) = MAX(s.num_courses);
STUDENTNO
s002