{"title":"NOT NULL","version":"1.0","height":"190","blog_title":"\u8eca\u8f2a\u306ex\u767a\u660e ~B.G's Blog~","author_url":"https://blog.hatena.ne.jp/BG1/","published":"2025-08-13 21:00:00","blog_url":"https://bg1.hatenablog.com/","description":"NOT NULL\u5236\u7d04\u306f\u3001\u5217\u304cNULL\u5024\u3092\u3068\u3089\u306a\u3044\u3053\u3068\u3092\u6307\u5b9a\u3059\u308b\u3002https://www.postgresql.jp/document/7.3/user/ddl-constraints.html postgresdb1=# CREATE TABLE users ( id INT, name VARCHAR(50) NOT NULL, email VARCHAR(50) NOT NULL ); CREATE TABLE postgresdb1=# INSERT INTO users (id, name, email) VALUES (1, 'Alice', 'alice@example.com')\u2026","type":"rich","width":"100%","provider_url":"https://hatena.blog","image_url":null,"provider_name":"Hatena Blog","url":"https://bg1.hatenablog.com/entry/2025/08/13/210000","categories":["PostgreSQL"],"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbg1.hatenablog.com%2Fentry%2F2025%2F08%2F13%2F210000\" title=\"NOT NULL - \u8eca\u8f2a\u306ex\u767a\u660e ~B.G&#39;s Blog~\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_name":"BG1"}