{"provider_name":"Hatena Blog","version":"1.0","author_url":"https://blog.hatena.ne.jp/Chiastolite/","width":"100%","blog_url":"https://chiastolite.hatenablog.com/","author_name":"Chiastolite","height":"190","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fchiastolite.hatenablog.com%2Fentry%2F2019%2F01%2F23%2F175251\" title=\"MySQL\u306egenerated column\u3092\u4f7f\u3063\u3066OR\u691c\u7d22\u3092\u6f70\u3059 - chiastolite\u2019s blog\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","type":"rich","provider_url":"https://hatena.blog","image_url":null,"categories":[],"description":"\u88fd\u54c1\u306b\u8ca9\u58f2\u671f\u9593\u8a2d\u5b9a\u304c\u3042\u308b\u5834\u5408\u306b\u3001\u8ca9\u58f2\u53ef\u80fd\u306a\u3082\u306e\u3092\u63a2\u3059\u306e\u306b\u2193\u306e\u3088\u3046\u306a\u30af\u30a8\u30ea\u304c\u767a\u884c\u3055\u308c\u308b\u3068\u3059\u308b (valid_from \u3068 valid_to \u304c null \u306e\u5834\u5408\u306f\u3001\u671f\u9593\u306e\u8a2d\u5b9a\u304c\u7279\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u304a\u3089\u305a\u671f\u9650\u306e\u30c1\u30a7\u30c3\u30af\u304c\u4e0d\u8981\u3068\u3044\u3046\u610f\u5473) SELECT * FROM products WHERE (valid_from < '2018-12-26' OR valid_from IS NULL) AND (valid_to > '2018-12-26' OR valid_to IS NULL) \u3053\u306e\u3068\u304d valid_from \u3068 valid_to \u306e\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u3042\u3063\u3066\u3082\u3001or\u691c\u7d22\u304c\u3042\u308b\u305f\u3081\u4e0a\u624b\u304f\u4f7f\u3063\u3066\u2026","title":"MySQL\u306egenerated column\u3092\u4f7f\u3063\u3066OR\u691c\u7d22\u3092\u6f70\u3059","published":"2019-01-23 17:52:51","url":"https://chiastolite.hatenablog.com/entry/2019/01/23/175251","blog_title":"chiastolite\u2019s blog"}