MySQLの外部キー制約RESTRICT,CASCADE,SET NULL,NO ACTIONの違いは？ - Qiita
-- Create syntax for TABLE 'categories' CREATE TABLE `categories` ( `id` int(11) unsigned NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- Create syntax for TABLE 'items' CREATE TABLE `items` ( `id` int(11) unsigned NOT NULL, `category_id` int(11) unsigned NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Protect Your Data with PostgreSQL Constraints
Posted on: 2016-01-08 What should validate your data - your application code, or your database? If you said "both", your answer is correct and you are entitled to feel smug for 1.5 seconds. And... stop. While application code can generally produce friendlier user errors, only the database knows what data it has right now - even if the application code ran a SELECT a few milliseconds ago, there may
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Z3 Constraint Solver library for Ruby
Ruby Quiz - Constraint Processing (#70)
http://www.minituku.net/drills/22902467/questions/785609361/result?choice=22072085&locale=en
Object#freezeについて - Qiita
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Constraint (mathematics) - Wikipedia
