{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhigepon.hatenablog.com%2Fentry%2F20090127%2F1233045643\" title=\" Projection - Evaluating Relational Operation - Database Management Systems - higepon blog\" 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","author_name":"higepon","type":"rich","image_url":"http://ecx.images-amazon.com/images/I/51i8D880drL.jpg","height":"190","blog_title":"higepon blog","categories":["study","db","database"],"author_url":"https://blog.hatena.ne.jp/higepon/","published":"2009-01-27 17:40:43","width":"100%","url":"https://higepon.hatenablog.com/entry/20090127/1233045643","provider_url":"https://hatena.blog","description":"Database Management Systems\u306e14\u7ae0\u3002 \u30de\u30a4\u30f3\u30c9\u30de\u30c3\u30d7\u304b\u3089\u518d\u69cb\u6210\u3057\u305f\u307e\u3068\u3081 Projection \u306e\u624b\u9806 \u4e0d\u8981 attribute \u3092\u524a\u9664 \u91cd\u8907 tuple \u306e\u524a\u9664 Projection based on Sorting Scan \u3057\u3066 attribute \u524a\u9664 tuple \u3092 Sort sort result \u3092 scan \u3057\u3066\u91cd\u8907\u3092\u524a\u9664 External sorting \u5927\u6d3b\u8e8d Projection based on Hashing \u524d\u63d0\uff1a\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u5341\u5206\u5927\u304d\u306a Buffer pages \u304c\u5b58\u5728\u3059\u308b\u4e8b \u30c7\u30fc\u30bf\u3092\u5165\u529b\u30d0\u30c3\u30d5\u30a1 1 page \u306b\u8aad\u307f\u8fbc\u307f\u3001\u5168\u3066\u306e tu\u2026","provider_name":"Hatena Blog","title":" Projection - Evaluating Relational Operation - Database Management Systems","blog_url":"https://higepon.hatenablog.com/"}