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POMySQL Database Structure for Followers
 

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    <p>I would like to implement a follow/favorite system. I can think of 2 ways of implementing a database/table structure but am unsure of which one to implement. Which one of these would be considered best practices and most importantly why?</p> <p>I put all of my followers in a single string. By putting all followers in a single string it reduces the amount of redundant rows.</p> <p>Ex.</p> <p>id (1) || user_id (1) || follower_ids (2, 3, 45)</p> <pre><code>'CREATE TABLE `users` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `username` varchar(20) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1'; 'CREATE TABLE `follow` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `user_id` int(10) unsigned NOT NULL, `follower_ids` text NOT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1'; </code></pre> <p>OR</p> <p>I put each follow_id individually but adds redundancy by having 3 rows for the same user_id.</p> <p>Ex.</p> <p>id (1) || user_id (1) || follower_id (2)</p> <p>id (2) || user_id (1) || follower_id (3)</p> <p>id (3) || user_id (1) || follower_id (45)</p> <pre><code>'CREATE TABLE `users` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `username` varchar(20) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1'; 'CREATE TABLE `follow` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `user_id` int(10) unsigned NOT NULL, `follower_id` int(10) unsigned NOT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1'; </code></pre>
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    1. COnon of them. They both miss indexes, probably the most important.
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      1. USGreen Black
 

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