{"url":"https://htn20190109.hatenablog.com/entry/2019/11/09/110043","categories":["DB"],"height":"190","author_url":"https://blog.hatena.ne.jp/HTN20190109/","published":"2019-11-09 11:00:43","title":"\u30c6\u30fc\u30d6\u30eb\u5bb9\u91cf\u898b\u7a4d","author_name":"HTN20190109","type":"rich","provider_name":"Hatena Blog","blog_title":"HTN20190109\u306e\u65e5\u8a18","image_url":null,"width":"100%","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhtn20190109.hatenablog.com%2Fentry%2F2019%2F11%2F09%2F110043\" title=\"\u30c6\u30fc\u30d6\u30eb\u5bb9\u91cf\u898b\u7a4d - 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>","blog_url":"https://htn20190109.hatenablog.com/","description":"Oracle (19c) http://otndnld.oracle.co.jp/skillup/oracle9i/3_1/index.html \u30101\u3011\u898b\u7a4d\u624b\u9806 1. 1\u30ec\u30b3\u30fc\u30c9\u306e\u5e73\u5747\u9577\u3092\u6c42\u3081\u308b [1\u30ec\u30b3\u30fc\u30c9\u306e\u5e73\u5747\u9577] = [\u30ec\u30b3\u30fc\u30c9\u30d8\u30c3\u30c0] + \u03a3([\u5217\u30d8\u30c3\u30c0] + [\u5217\u30c7\u30fc\u30bf]) [\u30ec\u30b3\u30fc\u30c9\u30d8\u30c3\u30c0] = 3\u30d0\u30a4\u30c8 [\u5217\u30d8\u30c3\u30c0] = \u5bfe\u5fdc\u3059\u308b\u5217\u306e\u30c7\u30fc\u30bf\u9577\u304c250\u30d0\u30a4\u30c8\u4ee5\u4e0b(NULL\u542b\u3080)\u306e\u5834\u5408\u306f1\u30d0\u30a4\u30c8\u3001251\u30d0\u30a4\u30c8\u4ee5\u4e0a\u306e\u5834\u5408\u306f3\u30d0\u30a4\u30c8 [\u5217\u30c7\u30fc\u30bf]CHAR \u2192 \u30c6\u30fc\u30d6\u30eb\u5b9a\u7fa9\u306e\u9577\u3055VARCHAR2 \u2192 \u5b9f\u969b\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u306e\u9577\u3055NUMBER \u2192 1 + CEIL(n / 2) ; n\u306f\u2026","version":"1.0"}