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Editorial Team
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Asked: 2026-06-08T08:30:06+00:00

I know that I can reset the primary key in this way: ALTER TABLE

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I know that I can reset the primary key in this way:

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;

But I’m wondering how I can adapt this to apply the primary key according to the timestamp in my timestamp column, i.e. the row with the oldest timestamp gets the value 1, the next oldest, the value 2, etc.

OUTPUT of SHOW CREATE TABLE

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
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1 Answer

  1. Editorial Team

    Create a new table called users2 that has the same structure as users:

    CREATE TABLE users2 LIKE users;

    Then run this statment:

    INSERT INTO users2
(col1, col2, ... coln)
SELECT col1, col2, ... coln
FROM users
ORDER BY your_timestamp

    For your specific table:

    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
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