{"provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fm-hiyama.hatenablog.com%2Fentry%2F2023%2F06%2F15%2F142619\" title=\"\u7d9a\u5831\u30fb\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\uff08\u591a\u9805\u95a2\u4fc2\u3001\u95a2\u4fc2\u306e\u5c5e\u6027\u3082\uff09 - \u6a9c\u5c71\u6b63\u5e78\u306e\u30ad\u30de\u30a4\u30e9\u98fc\u80b2\u8a18 (\u306f\u3066\u306aBlog)\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","height":"190","blog_url":"https://m-hiyama.hatenablog.com/","url":"https://m-hiyama.hatenablog.com/entry/2023/06/15/142619","author_url":"https://blog.hatena.ne.jp/m-hiyama/","description":"\u300c\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u3008\u591a\u91cd\u5ea6\u3009\u306e\u201c\u30ab\u30e9\u30b9\u306e\u8db3\u201d\u8a18\u6cd5\u304c\u5206\u304b\u3089\u306a\u3044\u300d\u306b\u304a\u3044\u3066\u3001\u95a2\u4fc2\u306e\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u3008\u591a\u91cd\u5ea6\u3009\u306e\u8aac\u660e\u304c\uff08\u50d5\u304c\u898b\u305f\u5c11\u6570\u306e\u4e8b\u4f8b\u3067\u306f\uff09\u66d6\u6627\u30fb\u610f\u5473\u4e0d\u660e\u3067\u56f0\u3063\u305f\u3082\u3093\u3060\u3001\u3068\u3044\u3046\u8a71\u3092\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u5f8c\u3001ER diagrams vs. EER diagrams: What\u2019s the difference? \u3068\u3044\u3046\u89e3\u8aac\u8a18\u4e8b\u306b\u6b21\u306e\u56f3\u3092\u898b\u3064\u3051\u307e\u3057\u305f\u3002$`\\newcommand{\\mrm}[1]{\\mathrm{#1}}`$Many\u304c\u5b9f\u306fAny\u3008\u4efb\u610f\u3009\u306a\u306e\u3060\u3068\u89e3\u91c8\u3059\u308c\u3070\u3001\u3053\u308c\u3089\u306e\u8a18\u53f7\u306f\u3001\u95a2\u4fc2\u3008\u975e\u6c7a\u5b9a\u6027\u95a2\u6570\u3009 $`R:A \\to B`$ \u306b\u95a2\u3059\u308b\u6b21\u306e\u6761\u4ef6\u3008\u5236\u7d04\u3009\u3092\u8868\u73fe\u3059\u308b\u3068\u601d\u308f\u308c\u307e\u3059\u3002 One \uff1a $`\\fo\u2026","version":"1.0","provider_name":"Hatena Blog","author_name":"m-hiyama","title":"\u7d9a\u5831\u30fb\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\uff08\u591a\u9805\u95a2\u4fc2\u3001\u95a2\u4fc2\u306e\u5c5e\u6027\u3082\uff09","blog_title":"\u6a9c\u5c71\u6b63\u5e78\u306e\u30ad\u30de\u30a4\u30e9\u98fc\u80b2\u8a18 (\u306f\u3066\u306aBlog)","image_url":"https://www.chimaira.org/img6/erd-cardinality-exam5.png","categories":["\u96d1\u8a18\uff0f\u5099\u5fd8"],"published":"2023-06-15 14:26:19","width":"100%","type":"rich"}