15 days of learning SQL

In this video we will deep dive on a problem called "15 days of learning SQL" from hacker rank. This is a challenging SQL problem to solve.

Here is the script:
CREATE TABLE Submissions (
submission_date DATE,
submission_id INT PRIMARY KEY,
hacker_id INT,
score INT
);

INSERT INTO Submissions (submission_date, submission_id, hacker_id, score) VALUES
('20160301', 8494, 20703, 0),
('20160301', 22403, 53473, 15),
('20160301', 23965, 79722, 60),
('20160301', 30173, 36396, 70),
('20160302', 34928, 20703, 0),
('20160302', 38740, 15758, 60),
('20160302', 42769, 79722, 25),
('20160302', 44364, 79722, 60),
('20160303', 45440, 20703, 0),
('20160303', 49050, 36396, 70),
('20160303', 50273, 79722, 5),
('20160304', 50344, 20703, 0),
('20160304', 51360, 44065, 90),
('20160304', 54404, 53473, 65),
('20160304', 61533, 79722, 15),
('20160305', 72852, 20703, 0),
('20160305', 74546, 38289, 0),
('20160305', 76487, 62529, 0),
('20160305', 82439, 36396, 10),
('20160305', 90006, 36396, 40),
('20160306', 90404, 20703, 0);

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