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WITH t(Student_ID,Year) AS ( SELECT 101,2018 FROM dual UNION ALL SELECT 101,2019 FROM dual UNION ALL SELECT 101,2021 FROM dual UNION ALL SELECT 102,2018 FROM dual UNION ALL SELECT 102,2021 FROM dual ) SELECT Student_ID, LISTAGG(Year,',') WITHIN GROUP (ORDER BY Student_ID) AS Year_of_Default FROM ( SELECT DISTINCT Student_ID, level + 2017 AS Year FROM t CONNECT BY level <= 4 MINUS SELECT Student_ID,Year FROM t ) GROUP BY Student_ID
STUDENT_ID
YEAR_OF_DEFAULT
101
2020
102
2019,2020