DROP TABLE IF EXISTS items;
CREATE TABLE items (
id INT PRIMARY KEY AUTO_INCREMENT NOT NULL,
score1 INT,
score2 INT,
created_at DATETIME,
INDEX (created_at, score1, score2)
) DEFAULT CHARSET=UTF8;
SHOW CREATE TABLE items;
Table	Create Table
items	CREATE TABLE `items` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `score1` int(11) DEFAULT NULL,
  `score2` int(11) DEFAULT NULL,
  `created_at` datetime DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `created_at` (`created_at`,`score1`,`score2`)
) ENGINE=Mroonga DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_uca1400_ai_ci
INSERT INTO items (score1, score2, created_at) VALUES(1, 0, "2015-07-01 00:00:00");
INSERT INTO items (score1, score2, created_at) VALUES(2, 0, "2015-07-01 00:00:00");
INSERT INTO items (score1, score2, created_at) VALUES(2, 0, "2015-07-01 12:00:00");
INSERT INTO items (score1, score2, created_at) VALUES(2, 0, "2015-07-02 00:00:00");
SELECT *
FROM items
WHERE created_at <= "2015-07-01 12:00:00"
       ORDER BY created_at DESC;
id	score1	score2	created_at
3	2	0	2015-07-01 12:00:00
2	2	0	2015-07-01 00:00:00
1	1	0	2015-07-01 00:00:00
DROP TABLE items;
