{"type":"rich","provider_url":"https://hatena.blog","url":"https://neilling.hateblo.jp/entry/2015/04/17/111121","description":"\u6587\u5b57\u5217\u7d50\u5408\u3092\u3059\u308b\u3068\u304d\u306f\u3001||\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u884c\u3046\u306e\u304cSQL\u7684\u3067\u306f\u3042\u308b\u304c\u3001\u3053\u3044\u3064\u306fNull\u304c\u5165\u308b\u3068\u7d50\u679c\u6587\u5b57\u5217\u3082Null\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u3002\u305d\u306e\u65b9\u304c\u3044\u3044\u5834\u5408\u3082\u3042\u308b\u3068\u601d\u3046\u304c\u3001\u5927\u62b5\u306e\u5834\u5408\u306fNull\u306f\u7a7a\u6587\u5b57\u3068\u898b\u505a\u3057\u3066\u6b32\u3057\u3044\u3002\u305d\u3046\u3044\u3046\u3068\u304d\u306fconcat()\u3092\u4f7f\u3046\u3068\u305d\u306e\u3088\u3046\u306b\u8a08\u3089\u3063\u3066\u304f\u308c\u308b\u3002MySQL\u306e\u3068\u304d\u306f\u4e21\u65b9\u3068\u3082\u7d50\u5408\u7d50\u679c\u306fNull\u3060\u3063\u305f\u306e\u3067\u3001\u3069\u3061\u3089\u306b\u305b\u3088coalesce()\u3067Null\u6392\u9664\u3057\u3066\u4f7f\u3046\u5fc5\u8981\u304c\u3042\u3063\u305f\u306f\u305a\u3060\u3051\u3069\u3001Postgre\u3067\u306f\u95a2\u6570\u4e00\u3064\u3067\u5bfe\u5fdc\u3055\u308c\u3066\u3044\u308b\u3002\u305f\u3060\u3057\u5bfe\u5fdc\u30d0\u30fc\u30b8\u30e7\u30f3\u306f9.1\u4ee5\u964d\u3089\u3057\u3044(9.1\u304b\u3089\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u767b\u5834\u3059\u308b)\u3002\u307e\u30424\u5e74\u524d\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u305f\u30d0\u30fc\u30b8\u30e7\u30f3\u306a\u306e\u3060\u304b\u3089\u3001\u4f7f\u3048\u308b\u3053\u3068\u306e\u65b9\u304c\u591a\u3044\u3067\u3057\u3087\u2026","blog_title":"\u3088\u308a\u9577\u7d9a\u304d\u3059\u308b\u30d6\u30ed\u30b0","title":"PostgreSQL\u306econcat()\u95a2\u6570\u306b\u3064\u3044\u3066\u306e\u5099\u5fd8\u9332","width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fneilling.hateblo.jp%2Fentry%2F2015%2F04%2F17%2F111121\" title=\"PostgreSQL\u306econcat()\u95a2\u6570\u306b\u3064\u3044\u3066\u306e\u5099\u5fd8\u9332 - \u3088\u308a\u9577\u7d9a\u304d\u3059\u308b\u30d6\u30ed\u30b0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","version":"1.0","published":"2015-04-17 11:11:21","image_url":null,"blog_url":"https://neilling.hateblo.jp/","author_name":"neilling","height":"190","author_url":"https://blog.hatena.ne.jp/neilling/","provider_name":"Hatena Blog","categories":[]}