還原試題

首先新建一張表來還原一下試題：

INSERT INTO last_3_day_test_table ( user_id , login_date )
VALUES
(‘A’, ‘2019/9/2’),
(‘A’, ‘2019/9/3’),
(‘A’, ‘2019/9/4’),
(‘B’, ‘2018/11/25’),
(‘B’, ‘2018/12/31’),
(‘C’, ‘2019/1/1’),
(‘C’, ‘2019/4/4’),
(‘C’, ‘2019/9/3’),
(‘C’, ‘2019/9/4’),
(‘C’, ‘2019/9/5’);