概要 データベーステーブルの物理設計を行うとき、論理削除とユニークキー制約を両立させるための TIPS です。 基本形 create table user ( id int not null, email varchar(40) not null, password_sha256 varchar(64) not null, removed int not null default 0, -- 論理削除カラム constraint pk primary key (id) ); -- 入会 insert into user (id, email, password_sha256) values (1, 'foo@example.com', '**dummy**'); -- ログイン removed = 0 select * from user where removed = 0 and ema
![論理削除とユニークキー制約の両立 - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/15f751feda1d14eaa0fc21b6bc1622ce7bdccdc2/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-9f5428127621718a910c8b63951390ad.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTkxNiZoPTMzNiZ0eHQ9JUU4JUFCJTk2JUU3JTkwJTg2JUU1JTg5JThBJUU5JTk5JUE0JUUzJTgxJUE4JUUzJTgzJUE2JUUzJTgzJThCJUUzJTgzJUJDJUUzJTgyJUFGJUUzJTgyJUFEJUUzJTgzJUJDJUU1JTg4JUI2JUU3JUI0JTg0JUUzJTgxJUFFJUU0JUI4JUExJUU3JUFCJThCJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9NTYmdHh0LWNsaXA9ZWxsaXBzaXMmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz0zMjM1MWNmOTE3OGRmNTQ3OTJiZTZkM2VhZmIwMzU0MA%26mark-x%3D142%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTYxNiZ0eHQ9JTQwbW9qYXR0ZXImdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT0zNiZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZzPWIwNjYzYjA2Mjk1MGQyM2RlMjFkYjJiOWQ4MDczM2Zj%26blend-x%3D142%26blend-y%3D491%26blend-mode%3Dnormal%26s%3D56de4622443be941ad7abd92b16d25f3)