我知道我可以通过这种方式重置主键:
ALTER TABLE `users` DROP `id`;
ALTER TABLE `users` AUTO_INCREMENT = 1;
ALTER TABLE `users` ADD `id` int UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY FIRST;
但我想知道如何根据我的时间戳列中的时间戳来调整它以应用主键,即时间戳最旧的行获得值 1,下一个最旧的行获得值 2,等等。
显示创建表的输出
CREATE TABLE `tracks` (
`id` int(10) unsigned NOT NULL auto_increment,
`timestamp` timestamp NOT NULL default CURRENT_TIMESTAMP,
`from_user` varchar(50) NOT NULL,
`source_filename` varchar(80) NOT NULL,
`uploaded_page` varchar(50) NOT NULL,
`operating_system` varchar(50) NOT NULL,
`browser` varchar(50) NOT NULL,
`os_browser_version` varchar(200) NOT NULL,
`title` varchar(100) NOT NULL,
`artist` varchar(60) NOT NULL,
`album` varchar(120) NOT NULL,
`genre` varchar(120) NOT NULL,
`format` varchar(10) NOT NULL,
`bitrate` mediumint(9) NOT NULL,
`conversion_needed` tinyint(1) NOT NULL COMMENT 'if not mp3, or higher than 192kbps',
`conversion_successful` tinyint(1) NOT NULL,
`art_extracted` tinyint(1) NOT NULL,
`art_location` varchar(200) NOT NULL,
`file_location` varchar(200) NOT NULL,
`status` varchar(500) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=96 DEFAULT CHARSET=utf8
最佳答案
创建一个名为 users2
的新表,其结构与 users
相同:
CREATE TABLE users2 LIKE users;
然后运行这条语句:
INSERT INTO users2
(col1, col2, ... coln)
SELECT col1, col2, ... coln
FROM users
ORDER BY your_timestamp
对于您的特定表:
INSERT INTO tracks2
(`timestamp`,`from_user`,`source_filename`,`uploaded_page`,`operating_system`,`browser`,`os_browser_version`,`title`,`artist`,`album`,`genre`,`format`,`bitrate`,`conversion_needed`,`conversion_successful`,`art_extracted`,`art_location`,`file_location`,`status`)
SELECT `timestamp`,`from_user`,`source_filename`,`uploaded_page`,`operating_system`,`browser`,`os_browser_version`,`title`,`artist`,`album`,`genre`,`format`,`bitrate`,`conversion_needed`,`conversion_successful`,`art_extracted`,`art_location`,`file_location`,`status`
FROM tracks
ORDER BY timestamp
关于mysql - 如何根据MySQL表中的时间戳重置主键?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11640483/