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create table POSSESSION (
BOOK_ID INT,
TAKING_DATE DATE
);
create table BOOKS (
ID INT,
AUTHOR VARCHAR
);
INSERT INTO BOOKS VALUES (1, 'Popular Author'), (2, 'Less popular author');
INSERT INTO POSSESSION VALUES (1, '2021-05-06'), (2, '2021-07-08');
SELECT AUTHOR
FROM POSSESSION
INNER JOIN BOOKS ON BOOK_ID = BOOKS.ID
WHERE TAKING_DATE > (CURRENT_DATE - INTERVAL '1 year')
GROUP BY AUTHOR
ORDER BY COUNT(AUTHOR) DESC
FETCH FIRST 1 ROWS WITH TIES;
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