Created
November 7, 2018 15:59
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SQL Magic
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CREATE TABLE IF NOT EXISTS `clicks` ( | |
`id` int primary key not null auto_increment, | |
`login` varchar(20) NOT NULL, | |
`button` varchar(20) NOT NULL, | |
`dt` datetime not null | |
) DEFAULT CHARSET=utf8; | |
INSERT INTO `clicks` (`login`, `button`, `dt`) VALUES | |
('Alice', 'blue', NOW()), | |
('Alice', 'red', NOW() - INTERVAL 1 DAY), | |
('Alice', 'green', NOW() - INTERVAL 3 DAY), | |
('Bob', 'red', NOW() - INTERVAL 5 minute), | |
('Bob', 'green', NOW() - INTERVAL 7 hour), | |
('Bob', 'blue', NOW() + INTERVAL 1 day), | |
('Eve', 'red', NOW() - INTERVAL 5 second), | |
('Eve', 'green', NOW() - INTERVAL 2 hour), | |
('Eve', 'blue', NOW() + INTERVAL 7 hour); |
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SELECT login, button, dt FROM clicks WHERE id IN (SELECT id FROM (SELECT id, max(dt) FROM clicks GROUP BY login) t); |
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