{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fotiai10.hatenablog.com%2Fentry%2F2016%2F02%2F16%2F181325\" title=\"\u3010MySQL\u3011DEFAULT NULL\u3068\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u306e\u540c\u5c45 - DRY\u306a\u5099\u5fd8\u9332\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","url":"https://otiai10.hatenablog.com/entry/2016/02/16/181325","title":"\u3010MySQL\u3011DEFAULT NULL\u3068\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u306e\u540c\u5c45","published":"2016-02-16 18:13:25","height":"190","categories":["mysql"],"blog_title":"DRY\u306a\u5099\u5fd8\u9332","width":"100%","image_url":null,"type":"rich","blog_url":"https://otiai10.hatenablog.com/","provider_url":"https://hatena.blog","provider_name":"Hatena Blog","description":"\u540c\u5c45\u3067\u304d\u308b\u3093\u304b\u306a\u3068\uff08\u307b\u3093\u3068\u306fMariaDB\uff09 mysql> CREATE TABLE users ( id SERIAL, name VARCHAR(255) ); Query OK, 0 rows affected (0.01 sec) mysql> CREATE TABLE posts ( user_id BIGINT(20) UNSIGNED DEFAULT NULL, # \u2190 \u3042\u3048\u3066\u3064\u3051\u308b message VARCHAR(255), FOREIGN KEY (user_id) REFERENCES users(id) ); Query OK, 0 rows affected (0.00\u2026","author_name":"otiai10","version":"1.0","author_url":"https://blog.hatena.ne.jp/otiai10/"}