PostgreSQL：SELECT WHERE不到15分钟

Question

从下面的events表中，如何选择不到15分钟前创建的events？

CREATE TABLE events (
    created_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
);

Answer 1

SELECT created_at FROM events WHERE created_at > NOW() - INTERVAL '15 minutes';

Answer 2

SELECT * FROM events WHERE age(now(), created_at) < '15 minutes';