これは、前/次のレコードを見つけるために使用するものです。テーブル内の任意の列を並べ替え列として使用でき、結合や厄介なハックは必要ありません:
次のレコード(現在のレコードよりも大きい日付):
SELECT id, title, MIN(created) AS created_date
FROM photo
WHERE created >
(SELECT created FROM photo WHERE id = '32kJ')
GROUP BY created
ORDER BY created ASC
LIMIT 1;
前のレコード(現在のレコードより前の日付):
SELECT id, title, MAX(created) AS created_date
FROM photo
WHERE created <
(SELECT created FROM photo WHERE id = '32kJ')
GROUP BY created
ORDER BY created DESC
LIMIT 1;
例:
CREATE TABLE `photo` (
`id` VARCHAR(5) NOT NULL,
`title` VARCHAR(255) NOT NULL,
`created` DATETIME NOT NULL,
INDEX `created` (`created` ASC),
PRIMARY KEY (`id`)
)
ENGINE = InnoDB;
INSERT INTO `photo` (`id`, `title`, `created`) VALUES ('XEi43', 'my family', '2009-08-04');
INSERT INTO `photo` (`id`, `title`, `created`) VALUES ('dDls', 'friends group', '2009-08-05');
INSERT INTO `photo` (`id`, `title`, `created`) VALUES ('32kJ', 'beautiful place', '2009-08-06');
INSERT INTO `photo` (`id`, `title`, `created`) VALUES ('EOIk', 'working late', '2009-08-07');
SELECT * FROM photo ORDER BY created;
+-------+-----------------+---------------------+
| id | title | created |
+-------+-----------------+---------------------+
| XEi43 | my family | 2009-08-04 00:00:00 |
| dDls | friends group | 2009-08-05 00:00:00 |
| 32kJ | beautiful place | 2009-08-06 00:00:00 |
| EOIk | working late | 2009-08-07 00:00:00 |
+-------+-----------------+---------------------+
SELECT id, title, MIN(created) AS next_date
FROM photo
WHERE created >
(SELECT created FROM photo WHERE id = '32kJ')
GROUP BY created
ORDER BY created ASC
LIMIT 1;
+------+--------------+---------------------+
| id | title | next_date |
+------+--------------+---------------------+
| EOIk | working late | 2009-08-07 00:00:00 |
+------+--------------+---------------------+
SELECT id, title, MAX(created) AS prev_date
FROM photo
WHERE created <
(SELECT created FROM photo WHERE id = '32kJ')
GROUP BY created
ORDER BY created DESC
LIMIT 1;
+------+---------------+---------------------+
| id | title | prev_date |
+------+---------------+---------------------+
| dDls | friends group | 2009-08-05 00:00:00 |
+------+---------------+---------------------+