{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbg1.hatenablog.com%2Fentry%2F2025%2F05%2F13%2F210000\" title=\"IS 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","image_url":null,"url":"https://bg1.hatenablog.com/entry/2025/05/13/210000","blog_title":"\u8eca\u8f2a\u306ex\u767a\u660e ~B.G's Blog~","height":"190","published":"2025-05-13 21:00:00","categories":["PostgreSQL"],"type":"rich","provider_name":"Hatena Blog","width":"100%","description":"IS NULL\u306f\u3001\u5024\u304cNULL\u3067\u3042\u308b\u3068\u3044\u3046\u6761\u4ef6\u3092\u8868\u3059\u3002https://www.postgresql.jp/docs/9.4/functions-comparison.html postgresdb1=# CREATE TABLE employees ( id INTEGER PRIMARY KEY, name VARCHAR(100) NOT NULL, birthday_str VARCHAR(20) ); CREATE TABLE postgresdb1=# INSERT INTO employees (id, name, birthday_str) VALUES (1, '\u7530\u4e2d\u592a\u90ce', \u2026","blog_url":"https://bg1.hatenablog.com/","title":"IS NULL","author_url":"https://blog.hatena.ne.jp/BG1/","provider_url":"https://hatena.blog","version":"1.0"}