我想仅在早于现在的情况下按字段toppped_time对mysql查询结果进行排序。例如,如果topped_time是2016-7-6,则应该考虑它,但如果topped_time是2016-7-16,则它应该被忽略。
我试过了
SELECT * FROM `article` ORDER BY IF(`topped_time` < CURRENT_TIME(), '`topped_time` DESC', ''), `published_time` DESC
和
SELECT * FROM `article` ORDER BY CASE WHEN `topped_time=` < CURRENT_TIME() THEN `topped_time` END, `published_time` DESC
即使比现在晚,仍然按 topped_time 排序。
这是表格:
CREATE TABLE `article` (
`id` bigint(20) UNSIGNED NOT NULL,
`published_time` datetime DEFAULT '0000-00-00 00:00:00',
`topped_time` datetime DEFAULT '0000-00-00 00:00:00'
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `article` (`id`, `published_time`, `topped_time`) VALUES
(1, '2016-07-05 22:01:14', '0000-00-00 00:00:00'),
(2, '2016-07-05 22:01:23', '0000-00-00 00:00:00'),
(3, '2016-07-05 22:01:25', '2016-07-07 00:00:00'),
(4, '2016-07-05 22:01:27', '0000-00-00 00:00:00'),
(5, '2016-07-05 22:01:29', '0000-00-00 00:00:00');
从这个截图来看,正确的顺序应该是id:4,5,3,2,1,因为id 4的topped_time是2016-07-06 00:00:00,比现在早,应该是第一个。而id 3的topped_time是2016-07-07 00:00:00,比现在晚,应该被忽略。
正确的查询是什么,或者是不可能的?
最佳答案
我想这是你的选择:
SELECT * FROM `article`
ORDER BY
IF (`topped_time` < NOW(), `topped_time`, '0000-00-00 00:00:00') DESC,
`published_time` DESC
+----+---------------------+---------------------+
| id | published_time | topped_time |
+----+---------------------+---------------------+
| 4 | 2016-07-05 22:01:27 | 2016-07-06 00:00:00 |
| 6 | 2016-07-05 22:01:28 | 2016-05-06 00:00:00 |
| 5 | 2016-07-05 22:01:29 | 0000-00-00 00:00:00 |
| 3 | 2016-07-05 22:01:25 | 2016-07-17 00:00:00 |
| 2 | 2016-07-05 22:01:23 | 0000-00-00 00:00:00 |
| 1 | 2016-07-05 22:01:14 | 0000-00-00 00:00:00 |
+----+---------------------+---------------------+
更新
您可能会注意到,我添加了额外的行来证明您的解决方案是错误的
SELECT * FROM article
ORDER BY topped_time < CURRENT_TIME() AND
topped_time DESC, published_time DESC;
+----+---------------------+---------------------+
| id | published_time | topped_time |
+----+---------------------+---------------------+
| 6 | 2016-07-05 22:01:28 | 2016-05-06 00:00:00 |
| 4 | 2016-07-05 22:01:27 | 2016-07-06 00:00:00 |
| 5 | 2016-07-05 22:01:29 | 0000-00-00 00:00:00 |
| 3 | 2016-07-05 22:01:25 | 2016-07-17 00:00:00 |
| 2 | 2016-07-05 22:01:23 | 0000-00-00 00:00:00 |
| 1 | 2016-07-05 22:01:14 | 0000-00-00 00:00:00 |
+----+---------------------+---------------------+
关于mysql - 如何只在满足特定条件的情况下现场下订单?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38218738/