{"blog_title":"bouzuya.hatenablog.com","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbouzuya.hatenablog.com%2Fentry%2F2021%2F10%2F06%2F224810\" title=\"UNIQUE \u5236\u7d04\u306f NULL \u306e\u5217\u3092\u8907\u6570\u542b\u3093\u3067\u3082\u826f\u3044 - bouzuya.hatenablog.com\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","categories":[],"width":"100%","published":"2021-10-06 22:48:10","height":"190","url":"https://bouzuya.hatenablog.com/entry/2021/10/06/224810","version":"1.0","title":"UNIQUE \u5236\u7d04\u306f NULL \u306e\u5217\u3092\u8907\u6570\u542b\u3093\u3067\u3082\u826f\u3044","type":"rich","author_url":"https://blog.hatena.ne.jp/bouzuya/","provider_name":"Hatena Blog","provider_url":"https://hatena.blog","image_url":null,"author_name":"bouzuya","description":"MySQL \u3084 PostgreSQL \u306e UNIQUE \u5236\u7d04\u306f NULL \u306e\u5217\u3092\u8907\u6570\u542b\u3093\u3067\u3082\u826f\u3044\u3002 MySQL 8.0 https://dev.mysql.com/doc/refman/8.0/ja/create-table.html \u3059\u3079\u3066\u306e\u30a8\u30f3\u30b8\u30f3\u306b\u3064\u3044\u3066\u3001UNIQUE \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u3001NULL \u3092\u542b\u3080\u3053\u3068\u304c\u3067\u304d\u308b\u30ab\u30e9\u30e0\u3067\u306e\u8907\u6570\u306e NULL \u5024\u3092\u8a31\u53ef\u3057\u307e\u3059\u3002 UNIQUE \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u30ab\u30e9\u30e0\u306b\u63a5\u982d\u8f9e\u5024\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u3001\u30ab\u30e9\u30e0\u5024\u306f\u63a5\u982d\u8f9e\u306e\u9577\u3055\u5185\u3067\u4e00\u610f\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002 PostgreSQL 13 https://www.postgresql.jp/document/13/html/sql\u2026","blog_url":"https://bouzuya.hatenablog.com/"}