{"author_name":"AJYA","provider_url":"https://hatena.blog","blog_title":"\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u958b\u767a\u8005\u306e\u65e5\u5e38","height":"190","categories":["SQL","\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0"],"type":"rich","title":"SQL\uff1aCOALESCE\u3092\u4f7f\u3063\u3066\u3001NULL\u30920\u306b\u7f6e\u304d\u63db\u3048\u308b","provider_name":"Hatena Blog","published":"2012-08-29 22:05:58","author_url":"https://blog.hatena.ne.jp/AJYA/","image_url":"http://cdn-ak.f.st-hatena.com/images/fotolife/A/AJYA/20120829/20120829215612.jpg","version":"1.0","blog_url":"https://ajya.hatenablog.jp/","width":"100%","url":"https://ajya.hatenablog.jp/entry/2012/08/29/220558","description":"SQL\u306f\u4f7f\u3048\u3070\u4f7f\u3046\u307b\u3069\u3001\u5965\u306e\u6df1\u3055\u304c\u308f\u304b\u3063\u3066\u304f\u308b\u3002 photo credit: kogakure via photo pin cc SELECT\u3057\u305f\u7d50\u679c\u3067\u3001\u6570\u5024\u9805\u76ee\u3092\u5fc5\u305a0\u306b\u3059\u308b\u65b9\u6cd5 PostgreSQL\u3067\u306f\u3001COALESCE\u3092\u4f7f\u3048\u3070\u3044\u3044\u3068\u3044\u3046\u3053\u3068\u304c\u308f\u304b\u3063\u305f\u3002 SELECT table_a.id_a, table_a.id_b, COALESCE(table_\uff42.data_a, 0), FROM table_a LEFT OUTER JOIN ( SELECT table.id_b, SUM(table.data) AS data_a FROM table GROUP BY table.id_b\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fajya.hatenablog.jp%2Fentry%2F2012%2F08%2F29%2F220558\" title=\"SQL\uff1aCOALESCE\u3092\u4f7f\u3063\u3066\u3001NULL\u30920\u306b\u7f6e\u304d\u63db\u3048\u308b - \u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u958b\u767a\u8005\u306e\u65e5\u5e38\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}