{"author_name":"ihiro81","url":"https://ihiro81.hatenablog.jp/entry/2017/09/19/174302","width":"100%","published":"2017-09-19 17:43:02","author_url":"https://blog.hatena.ne.jp/ihiro81/","provider_url":"https://hatena.blog","blog_url":"https://ihiro81.hatenablog.jp/","version":"1.0","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fihiro81.hatenablog.jp%2Fentry%2F2017%2F09%2F19%2F174302\" title=\"MySQL\u3067\u6587\u5b57\u5217\u306e\u7d50\u5408 - \u30ef\u30fc\u30eb\u30c9\u30fb\u30a4\u30ce\u30d9\u30fc\u30b7\u30e7\u30f3\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_title":"\u30ef\u30fc\u30eb\u30c9\u30fb\u30a4\u30ce\u30d9\u30fc\u30b7\u30e7\u30f3","title":"MySQL\u3067\u6587\u5b57\u5217\u306e\u7d50\u5408","provider_name":"Hatena Blog","description":"MySQL\u3067\u65e2\u5b58\u306e\u30ab\u30e9\u30e0\u306b\u6587\u5b57\u5217\u3092\u7d50\u5408\u3057\u305f\u3044\u5834\u5408\u306f\u3001CONCAT\u3092\u4f7f\u3044\u307e\u3059\u3002 select concat(column1, column2, column3, column4) from table; \u66f4\u65b0\u6642 update users set name = concat(name, \"\u8ffd\u52a0\u3057\u305f\u3044\u6587\u5b57\u5217\") where id = 1; \u4ed6\u306e\u30ab\u30e9\u30e0\u3068\u7d50\u5408\u3055\u305b\u308b update users set name = concat(name, kana) where id = 1; \u305f\u3060\u3057\u3001null \u304c\u5bfe\u8c61\u306e\u30ab\u30e9\u30e0\u306b\u5165\u3063\u3066\u308b\u5834\u5408\u306b\u306f\u7d50\u5408\u3057\u3066\u304f\u308c\u305a\u3001null \u306e\u307e\u307e\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002 null \u304c\u5165\u3063\u3066\u3044\u3066\u2026","height":"190","categories":[],"type":"rich"}