Database schema:
CREATE TABLE Students (
  student_id NUMBER PRIMARY KEY,
  bio_data TEXT,
  student_details TEXT
);
CREATE TABLE Transcripts (
  transcript_id NUMBER PRIMARY KEY,
  student_id NUMBER,
  date_of_transcript TIME,
  transcript_details TEXT,
  FOREIGN KEY (student_id) REFERENCES Students(student_id)
);
CREATE TABLE Behaviour_Monitoring (
  behaviour_monitoring_id NUMBER PRIMARY KEY,
  student_id NUMBER,
  behaviour_monitoring_details TEXT,
  FOREIGN KEY (student_id) REFERENCES Students(student_id)
);
CREATE TABLE Addresses (
  address_id NUMBER PRIMARY KEY,
  address_details TEXT
);
CREATE TABLE Ref_Event_Types (
  event_type_code TEXT PRIMARY KEY,
  event_type_description TEXT
);
CREATE TABLE Ref_Achievement_Type (
  achievement_type_code TEXT PRIMARY KEY,
  achievement_type_description TEXT
);
CREATE TABLE Ref_Address_Types (
  address_type_code TEXT PRIMARY KEY,
  address_type_description TEXT
);
CREATE TABLE Ref_Detention_Type (
  detention_type_code TEXT PRIMARY KEY,
  detention_type_description TEXT
);
CREATE TABLE Student_Events (
  event_id NUMBER PRIMARY KEY,
  event_type_code TEXT,
  student_id NUMBER,
  event_date TIME,
  other_details TEXT,
  FOREIGN KEY (event_type_code) REFERENCES Ref_Event_Types(event_type_code),
  FOREIGN KEY (student_id) REFERENCES Students(student_id)
);
CREATE TABLE Teachers (
  teacher_id NUMBER PRIMARY KEY,
  teacher_details TEXT
);
CREATE TABLE Student_Loans (
  student_loan_id NUMBER PRIMARY KEY,
  student_id NUMBER,
  date_of_loan TIME,
  amount_of_loan NUMBER,
  other_details TEXT,
  FOREIGN KEY (student_id) REFERENCES Students(student_id)
);
CREATE TABLE Classes (
  class_id NUMBER PRIMARY KEY,
  student_id NUMBER,
  teacher_id NUMBER,
  class_details TEXT,
  FOREIGN KEY (teacher_id) REFERENCES Teachers(teacher_id),
  FOREIGN KEY (student_id) REFERENCES Students(student_id)
);
CREATE TABLE Students_Addresses (
  student_address_id NUMBER PRIMARY KEY,
  address_id NUMBER,
  address_type_code TEXT,
  student_id NUMBER,
  date_from TIME,
  date_to TIME,
  FOREIGN KEY (address_type_code) REFERENCES Ref_Address_Types(address_type_code),
  FOREIGN KEY (address_id) REFERENCES Addresses(address_id),
  FOREIGN KEY (student_id) REFERENCES Students(student_id)
);
CREATE TABLE Detention (
  detention_id NUMBER PRIMARY KEY,
  detention_type_code TEXT,
  student_id NUMBER,
  datetime_detention_start TIME,
  datetime_detention_end TIME,
  detention_summary TEXT,
  other_details TEXT,
  FOREIGN KEY (detention_type_code) REFERENCES Ref_Detention_Type(detention_type_code),
  FOREIGN KEY (student_id) REFERENCES Students(student_id)
);
CREATE TABLE Achievements (
  achievement_id NUMBER PRIMARY KEY,
  achievement_type_code TEXT,
  student_id NUMBER,
  date_achievement TIME,
  achievement_details TEXT,
  other_details TEXT,
  FOREIGN KEY (achievement_type_code) REFERENCES Ref_Achievement_Type(achievement_type_code),
  FOREIGN KEY (student_id) REFERENCES Students(student_id)
);

Question: What is the type of event the most students joined? Give me the number of students, and the event type code and description.
SQL: SELECT count(*) ,  T2.event_type_code ,  T3.event_type_description FROM Students AS T1 JOIN Student_Events AS T2 ON T1.student_id  =  T2.student_id JOIN Ref_Event_Types AS T3 ON T2.event_type_code  =  T3.event_type_code GROUP BY T2.event_type_code ORDER BY count(*) DESC LIMIT 1

Question: Which student has the loan with the minimum value? List the student's biographical information.
SQL: SELECT T1.bio_data FROM Students AS T1 JOIN Student_Loans AS T2 ON T1.student_id  =  T2.student_id ORDER BY T2.amount_of_loan ASC LIMIT 1

Question: Show the detention start time and end time of the detentions.
SQL: SELECT datetime_detention_start ,  datetime_detention_end FROM Detention

Question: Which teacher teaches the most courses? Give me the id of the teacher and the number of courses he or she teaches.
SQL: SELECT count(*) ,  teacher_id FROM Classes GROUP BY teacher_id ORDER BY count(*) DESC LIMIT 1

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

Question: What are the type code, details, and date of each achievement?
SQL: SELECT achievement_type_code ,  achievement_details ,  date_achievement FROM Achievements