{"author_url":"https://blog.hatena.ne.jp/HTN20190109/","type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhtn20190109.hatenablog.com%2Fentry%2F2022%2F03%2F05%2F184533\" title=\"SQL\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u624b\u9806\u307e\u3068\u3081 - HTN20190109\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":null,"width":"100%","provider_url":"https://hatena.blog","description":"\u53c2\u8003\u8a18\u4e8b:HJ/NL\u306e\u5207\u66ff\u4ef6\u6570\u78ba\u8a8d\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u3068\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30a2\u30af\u30bb\u30b9HJ\u7d50\u5408\u9806\u3078\u306e\u30c7\u30fc\u30bf\u4ef6\u6570\u5f71\u97ffHJ\u3067\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u3068\u30c6\u30fc\u30d6\u30eb\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u306e\u6bd4\u8f03\u7d50\u5408\u6761\u4ef6\u306e\u63a8\u79fb\u5f8b\u5916\u90e8\u7d50\u5408\u306b\u3088\u308b\u7d50\u5408\u9806\u306e\u5236\u7d04(HJ)\u5916\u90e8\u7d50\u5408\u306b\u3088\u308b\u7d50\u5408\u9806\u306e\u5236\u7d04(NL)\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u30ef\u30a4\u30ba\u30b8\u30e7\u30a4\u30f3 [1] \u7d50\u5408\u30bf\u30a4\u30d7\u304cNL\u578b\u304bHJ\u578b\u304b\u306e\u5224\u5b9a \u305d\u306eSQL\u304c\u6271\u3046\u51e6\u7406\u4ef6\u6570\u3092\u78ba\u8a8d\u3059\u308b\u30021\uff5e10\u4e07\u4ef6\u4ee5\u4e0b\u306e\u5834\u5408\u306fNested loop\u3001\u305d\u308c\u4ee5\u4e0a\u306e\u5834\u5408\u306fHash Join\u3068\u3059\u308bMerge Join\u306f\u691c\u8a0e\u4e0d\u8981 \u8907\u96d1\u306aSQL\u306e\u5834\u5408\u306f\u3001\u3053\u306e2\u3064\u306e\u578b\u304c\u6df7\u5728\u3059\u308b\u5834\u5408\u3082\u3042\u308b [2] \u7d50\u5408\u30bf\u30a4\u30d7\u304cNL\u578b\u306e\u5834\u5408 [2.1]\u30a2\u30af\u30bb\u30b9\u30d1\u30b9\u306b\u3064\u3044\u3066\u6700\u521d\u306b\u30a2\u30af\u2026","version":"1.0","title":"SQL\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u624b\u9806\u307e\u3068\u3081","blog_url":"https://htn20190109.hatenablog.com/","blog_title":"HTN20190109\u306e\u65e5\u8a18","url":"https://htn20190109.hatenablog.com/entry/2022/03/05/184533","provider_name":"Hatena Blog","height":"190","author_name":"HTN20190109","published":"2022-03-05 18:45:33","categories":["\u305d\u306e\u4ed6"]}