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 are the loan amounts and loan dates of the students who have at least 2 achievements?
SQL: SELECT amount_of_loan ,  date_of_loan FROM Student_Loans WHERE student_id IN ( SELECT student_id FROM Achievements GROUP BY student_id HAVING count(*)  >=  2 )

Question: How many students have gone through a detention?
SQL: SELECT count(DISTINCT student_id) FROM Detention

Question: What is the most common student address type? Give me the code and description of the address type.
SQL: SELECT T1.address_type_code ,  T2.address_type_description FROM Students_Addresses AS T1 JOIN Ref_Address_Types AS T2 WHERE T1.address_type_code  =  T2.address_type_code GROUP BY T1.address_type_code ORDER BY count(*) DESC LIMIT 1

Question: What are the detail and id of the teacher who teaches the largest number of courses?
SQL: SELECT T1.teacher_details ,  T1.teacher_id FROM Teachers AS T1 JOIN Classes AS T2 ON T1.teacher_id  =  T2.teacher_id GROUP BY T1.teacher_id ORDER BY count(*) DESC LIMIT 1

Question: What are the personal details and the address type descriptions of each student?
SQL: SELECT DISTINCT T1.student_details ,  T3.address_type_description FROM Students AS T1 JOIN Students_Addresses AS T2 ON T1.student_id  =  T2.student_id JOIN Ref_Address_Types AS T3 ON T2.address_type_code  =  T3.address_type_code

Question: What is the biographical information of the students who got the most common result for their behaviour monitoring details ?
SQL: select t1.bio_data from students as t1 join behaviour_monitoring as t2 on t1.student_id  =  t2.student_id where t2.behaviour_monitoring_details in ( select behaviour_monitoring_details from behaviour_monitoring group by behaviour_monitoring_details order by count(*) desc limit 1 ) except select t1.bio_data from students as t1 join behaviour_monitoring as t2 on t1.student_id  =  t2.student_id where t2.behaviour_monitoring_details not in ( select behaviour_monitoring_details from behaviour_monitoring group by behaviour_monitoring_details order by count(*) desc limit 1 )

Question: Return the earliest date of loan in the record.
SQL: SELECT date_of_loan FROM Student_Loans ORDER BY date_of_loan ASC LIMIT 1

Question: What is the average amount of a student loan?
SQL: SELECT avg(amount_of_loan) FROM Student_Loans

Question: Find the details of the teachers who have taught the student with the earliest transcript issuance.
SQL: SELECT T1.teacher_details FROM Teachers AS T1 JOIN Classes AS T2 ON T1.teacher_id  =  T2.teacher_id JOIN Transcripts AS T3 ON T2.student_id  =  T3.student_id ORDER BY T3.date_of_transcript ASC LIMIT 1

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

Question: Give me the type code and description of the least common detention type.
SQL: SELECT T1.detention_type_code ,  T2.detention_type_description FROM Detention AS T1 JOIN Ref_Detention_Type AS T2 ON T1.detention_type_code  =  T2.detention_type_code GROUP BY T1.detention_type_code ORDER BY count(*) ASC LIMIT 1

Question: List the amount and date of loan for the students who have two or more achievements.
SQL: SELECT amount_of_loan ,  date_of_loan FROM Student_Loans WHERE student_id IN ( SELECT student_id FROM Achievements GROUP BY student_id HAVING count(*)  >=  2 )

Question: What is the least common detention type? Show the type code and the description.
SQL: SELECT T1.detention_type_code ,  T2.detention_type_description FROM Detention AS T1 JOIN Ref_Detention_Type AS T2 ON T1.detention_type_code  =  T2.detention_type_code GROUP BY T1.detention_type_code ORDER BY count(*) ASC LIMIT 1

Question: Find the biographical information of the student with the smallest student loan.
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: How many courses do teachers teach at most? Also find the id of the teacher who teaches the most.
SQL: SELECT count(*) ,  teacher_id FROM Classes GROUP BY teacher_id ORDER BY count(*) DESC LIMIT 1

Question: What are the pairs of teachers and students who are in the same class? Give me the pairs of their details.
SQL: SELECT T1.teacher_details ,  T3.student_details FROM Teachers AS T1 JOIN Classes AS T2 ON T1.teacher_id  =  T2.teacher_id JOIN Students AS T3 ON T2.student_id  =  T3.student_id

Question: When was the transcript issued for the student with loan of maximum value?
SQL: SELECT T1.date_of_transcript FROM Transcripts AS T1 JOIN Student_Loans AS T2 ON T1.student_id  =  T2.student_id ORDER BY T2.amount_of_loan DESC LIMIT 1