SELECT * FROM student;
 
--Example 1
SELECT MAX(fees_paid) AS MAX_TEST
FROM student;
 
--Example 2
SELECT MAX(first_name) AS MAX_TEST
FROM student;
 
--Example 3
SELECT MAX(enrolment_date) AS MAX_TEST
FROM student;
 
--Example 4
SELECT TO_CHAR(enrolment_date, 'MON') AS ENROLMENT_MONTH,
MAX(fees_paid) AS MAX_FEES
FROM student
GROUP BY TO_CHAR(enrolment_date, 'MON');
 
--Example 5
SELECT first_name, last_name, enrolment_date, MAX(fees_paid) OVER (PARTITION BY TO_CHAR(enrolment_date, 'MON'))  AS MAX_TEST
FROM student
ORDER BY last_name, first_name