Database: cre_Students_Information_Systems
Question: Among the students who have an event record, who do not have a student loan? Return the students' biographical data.
SQL:
SELECT T1.bio_data FROM Students AS T1 JOIN Student_Events AS T2 WHERE T1.student_id  =  T2.student_id EXCEPT SELECT T1.bio_data FROM Students AS T1 JOIN Student_Loans AS T2 WHERE T1.student_id  =  T2.student_id