{"id":3692,"date":"2019-07-22T11:35:11","date_gmt":"2019-07-22T03:35:11","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=3692"},"modified":"2019-07-22T11:35:11","modified_gmt":"2019-07-22T03:35:11","slug":"%e5%a6%82%e4%bd%95%e8%a7%a3%e9%87%8a%e5%85%b3%e7%b3%bb%e6%95%b0%e6%8d%ae%e5%ba%93%e7%9a%84%e7%ac%ac%e4%b8%80%e7%ac%ac%e4%ba%8c%e7%ac%ac%e4%b8%89%e8%8c%83%e5%bc%8f%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/3692","title":{"rendered":"\u5982\u4f55\u89e3\u91ca\u5173\u7cfb\u6570\u636e\u5e93\u7684\u7b2c\u4e00\u7b2c\u4e8c\u7b2c\u4e09\u8303\u5f0f\uff1f"},"content":{"rendered":"<div><a href=\"https:\/\/www.zhihu.com\/question\/24696366\/answer\/29189700\">\u539f\u6587\u5730\u5740<\/a><\/p>\n<div>\n<p>\u56fd\u5185\u7edd\u5927\u591a\u6570\u9662\u6821\u7528\u7684\u738b\u73ca\u7684\u300a\u6570\u636e\u5e93\u7cfb\u7edf\u6982\u8bba\u300b\u8fd9\u672c\u6559\u6750\uff0c\u67d0\u4e9b\u65b9\u9762\u5e76\u6ca1\u6709\u7ed9\u51fa\u5f88\u8be6\u7ec6\u5f88\u660e\u786e\u7684\u89e3\u91ca\uff0c\u4e0e\u5b9e\u9645\u5e94\u7528\u8054\u7cfb\u4e0d\u90a3\u4e48\u7d27\u5bc6\uff0c\u4f60\u6709\u8fd9\u6837\u7684\u7591\u95ee\u4e5f\u662f\u633a\u6b63\u5e38\u7684\u3002\u6211\u6559\u300a\u6570\u636e\u5e93\u539f\u7406\u300b\u8fd9\u95e8\u8bfe\u6709\u51e0\u5e74\u4e86\uff0c\u6709\u5f88\u591a\u5b66\u751f\u63d0\u51fa\u4e86\u548c\u4f60\u4e00\u6837\u7684\u95ee\u9898\uff0c\u8bd5\u7740\u7ed9\u4f60\u89e3\u91ca\u4e00\u4e0b\u5427\u3002\uff08\u57fa\u672c\u6765\u81ea\u4e8e\u6211\u4e0a\u8bfe\u7684\u5185\u5bb9\uff0c\u67d0\u4e9b\u5730\u65b9\u4e3a\u4e86\u4e0d\u8fc7\u4e8e\u5570\u55e6\uff0c\u653e\u5f03\u4e86\u4e00\u5b9a\u7684\u4e25\u8c28\uff0c\u4e3b\u8981\u662f\u5728\u201c\u5173\u7cfb\u201d\u548c\u201c\u8868\u201d\u4e0a\uff09<\/p>\n<p>\u9996\u5148\u8981\u660e\u767d\u201d\u8303\u5f0f\uff08NF\uff09\u201d\u662f\u4ec0\u4e48\u610f\u601d\u3002\u6309\u7167\u6559\u6750\u4e2d\u7684\u5b9a\u4e49\uff0c\u8303\u5f0f\u662f\u201c\u7b26\u5408\u67d0\u4e00\u79cd\u7ea7\u522b\u7684\u5173\u7cfb\u6a21\u5f0f\u7684\u96c6\u5408\uff0c\u8868\u793a\u4e00\u4e2a\u5173\u7cfb\u5185\u90e8\u5404\u5c5e\u6027\u4e4b\u95f4\u7684\u8054\u7cfb\u7684\u5408\u7406\u5316\u7a0b\u5ea6\u201d\u3002\u5f88\u6666\u6da9\u5427\uff1f\u5b9e\u9645\u4e0a\u4f60\u53ef\u4ee5\u628a\u5b83\u7c97\u7565\u5730\u7406\u89e3\u4e3a<b>\u4e00\u5f20\u6570\u636e\u8868\u7684\u8868\u7ed3\u6784\u6240\u7b26\u5408\u7684\u67d0\u79cd\u8bbe\u8ba1\u6807\u51c6\u7684\u7ea7\u522b<\/b>\u3002\u5c31\u50cf\u5bb6\u91cc\u88c5\u4fee\u4e70\u5efa\u6750\uff0c\u6700\u73af\u4fdd\u7684\u662fE0\u7ea7\uff0c\u5176\u6b21\u662fE1\u7ea7\uff0c\u8fd8\u6709E2\u7ea7\u7b49\u7b49\u3002\u6570\u636e\u5e93\u8303\u5f0f\u4e5f\u5206\u4e3a1NF\uff0c2NF\uff0c3NF\uff0cBCNF\uff0c4NF\uff0c5NF\u3002\u4e00\u822c\u5728\u6211\u4eec\u8bbe\u8ba1\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u65f6\u5019\uff0c\u6700\u591a\u8003\u8651\u5230BCNF\u5c31\u591f\u3002\u7b26\u5408\u9ad8\u4e00\u7ea7\u8303\u5f0f\u7684\u8bbe\u8ba1\uff0c\u5fc5\u5b9a\u7b26\u5408\u4f4e\u4e00\u7ea7\u8303\u5f0f\uff0c\u4f8b\u5982\u7b26\u54082NF\u7684\u5173\u7cfb\u6a21\u5f0f\uff0c\u5fc5\u5b9a\u7b26\u54081NF\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u5c31\u5bf9\u6bcf\u4e00\u7ea7\u8303\u5f0f\u8fdb\u884c\u4e00\u4e0b\u89e3\u91ca\uff0c\u9996\u5148\u662f<b>\u7b2c\u4e00\u8303\u5f0f\uff081NF\uff09\u3002<\/b><\/p>\n<p>\u7b26\u54081NF\u7684\u5173\u7cfb\uff08\u4f60\u53ef\u4ee5\u7406\u89e3\u4e3a\u6570\u636e\u8868\u3002\u201c\u5173\u7cfb\u6a21\u5f0f\u201d\u548c\u201c\u5173\u7cfb\u201d\u7684\u533a\u522b\uff0c\u7c7b\u4f3c\u4e8e\u9762\u5411\u5bf9\u8c61\u7a0b\u5e8f\u8bbe\u8ba1\u4e2d\u201d\u7c7b\u201c\u4e0e\u201d\u5bf9\u8c61\u201c\u7684\u533a\u522b\u3002\u201d\u5173\u7cfb\u201c\u662f\u201d\u5173\u7cfb\u6a21\u5f0f\u201c\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u4f60\u53ef\u4ee5\u628a\u201d\u5173\u7cfb\u201d\u7406\u89e3\u4e3a\u4e00\u5f20\u5e26\u6570\u636e\u7684\u8868\uff0c\u800c\u201c\u5173\u7cfb\u6a21\u5f0f\u201d\u662f\u8fd9\u5f20\u6570\u636e\u8868\u7684\u8868\u7ed3\u6784\u3002<b>1NF\u7684\u5b9a\u4e49\u4e3a\uff1a\u7b26\u54081NF\u7684\u5173\u7cfb\u4e2d\u7684\u6bcf\u4e2a\u5c5e\u6027\u90fd\u4e0d\u53ef\u518d\u5206\u3002\u88681<\/b>\u6240\u793a\u7684\u60c5\u51b5\uff0c\u5c31\u4e0d\u7b26\u54081NF\u7684\u8981\u6c42\u3002<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/50\/24afd11455ac34a280fa83e4e8d75ccc_hd.jpg\" data-caption=\"\" data-rawwidth=\"743\" data-rawheight=\"157\" class=\"origin_image zh-lightbox-thumb\" width=\"743\" data-original=\"https:\/\/pic4.zhimg.com\/24afd11455ac34a280fa83e4e8d75ccc_r.jpg\"\/><\/noscript><img decoding=\"async\" class=\"origin_image zh-lightbox-thumb lazy\" src=\"https:\/\/pic4.zhimg.com\/80\/24afd11455ac34a280fa83e4e8d75ccc_hd.jpg\" width=\"743\" data-caption=\"\" data-rawwidth=\"743\" data-rawheight=\"157\" data-original=\"https:\/\/pic4.zhimg.com\/24afd11455ac34a280fa83e4e8d75ccc_r.jpg\" data-actualsrc=\"https:\/\/pic4.zhimg.com\/50\/24afd11455ac34a280fa83e4e8d75ccc_hd.jpg\" \/><\/figure>\n<p>\u88681<\/p>\n<p>\u5b9e\u9645\u4e0a\uff0c<b>1NF\u662f\u6240\u6709\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u6700\u57fa\u672c\u8981\u6c42<\/b>\uff0c\u4f60\u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08RDBMS\uff09\uff0c\u4f8b\u5982SQL Server\uff0cOracle\uff0cMySQL\u4e2d\u521b\u5efa\u6570\u636e\u8868\u7684\u65f6\u5019\uff0c\u5982\u679c\u6570\u636e\u8868\u7684\u8bbe\u8ba1\u4e0d\u7b26\u5408\u8fd9\u4e2a\u6700\u57fa\u672c\u7684\u8981\u6c42\uff0c\u90a3\u4e48\u64cd\u4f5c\u4e00\u5b9a\u662f\u4e0d\u80fd\u6210\u529f\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ea\u8981\u5728RDBMS\u4e2d\u5df2\u7ecf\u5b58\u5728\u7684\u6570\u636e\u8868\uff0c\u4e00\u5b9a\u662f\u7b26\u54081NF\u7684\u3002\u5982\u679c\u6211\u4eec\u8981\u5728RDBMS\u4e2d\u8868\u73b0\u8868\u4e2d\u7684\u6570\u636e\uff0c\u5c31\u5f97\u8bbe\u8ba1\u4e3a<b>\u88682<\/b>\u7684\u5f62\u5f0f\uff1a<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/50\/6b735fb9503b0930e741faa474fed28e_hd.jpg\" data-caption=\"\" data-rawwidth=\"881\" data-rawheight=\"136\" class=\"origin_image zh-lightbox-thumb\" width=\"881\" data-original=\"https:\/\/pic3.zhimg.com\/6b735fb9503b0930e741faa474fed28e_r.jpg\"\/><\/noscript><img decoding=\"async\" class=\"origin_image zh-lightbox-thumb lazy\" src=\"https:\/\/pic3.zhimg.com\/80\/6b735fb9503b0930e741faa474fed28e_hd.jpg\" width=\"881\" data-caption=\"\" data-rawwidth=\"881\" data-rawheight=\"136\" data-original=\"https:\/\/pic3.zhimg.com\/6b735fb9503b0930e741faa474fed28e_r.jpg\" data-actualsrc=\"https:\/\/pic3.zhimg.com\/50\/6b735fb9503b0930e741faa474fed28e_hd.jpg\" \/><\/figure>\n<p>\u88682<\/p>\n<p>\u4f46\u662f\u4ec5\u4ec5\u7b26\u54081NF\u7684\u8bbe\u8ba1\uff0c\u4ecd\u7136\u4f1a\u5b58\u5728\u6570\u636e\u5197\u4f59\u8fc7\u5927\uff0c\u63d2\u5165\u5f02\u5e38\uff0c\u5220\u9664\u5f02\u5e38\uff0c\u4fee\u6539\u5f02\u5e38\u7684\u95ee\u9898\uff0c\u4f8b\u5982\u5bf9\u4e8e<b>\u88683<\/b>\u4e2d\u7684\u8bbe\u8ba1\uff1a<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/50\/5b16f655b57a957bfa340d0a996a0eea_hd.jpg\" data-caption=\"\" data-rawwidth=\"661\" data-rawheight=\"349\" class=\"origin_image zh-lightbox-thumb\" width=\"661\" data-original=\"https:\/\/pic4.zhimg.com\/5b16f655b57a957bfa340d0a996a0eea_r.jpg\"\/><\/noscript><img decoding=\"async\" class=\"origin_image zh-lightbox-thumb lazy\" src=\"https:\/\/pic4.zhimg.com\/80\/5b16f655b57a957bfa340d0a996a0eea_hd.jpg\" width=\"661\" data-caption=\"\" data-rawwidth=\"661\" data-rawheight=\"349\" data-original=\"https:\/\/pic4.zhimg.com\/5b16f655b57a957bfa340d0a996a0eea_r.jpg\" data-actualsrc=\"https:\/\/pic4.zhimg.com\/50\/5b16f655b57a957bfa340d0a996a0eea_hd.jpg\" \/><\/figure>\n<p>\u88683<\/p>\n<ol>\n<li>\u6bcf\u4e00\u540d\u5b66\u751f\u7684\u5b66\u53f7\u3001\u59d3\u540d\u3001\u7cfb\u540d\u3001\u7cfb\u4e3b\u4efb\u8fd9\u4e9b\u6570\u636e\u91cd\u590d\u591a\u6b21\u3002\u6bcf\u4e2a\u7cfb\u4e0e\u5bf9\u5e94\u7684\u7cfb\u4e3b\u4efb\u7684\u6570\u636e\u4e5f\u91cd\u590d\u591a\u6b21\u2014\u2014<b>\u6570\u636e\u5197\u4f59\u8fc7\u5927<\/b><\/li>\n<li>\u5047\u5982\u5b66\u6821\u65b0\u5efa\u4e86\u4e00\u4e2a\u7cfb\uff0c\u4f46\u662f\u6682\u65f6\u8fd8\u6ca1\u6709\u62db\u6536\u4efb\u4f55\u5b66\u751f\uff08\u6bd4\u59823\u6708\u4efd\u5c31\u65b0\u5efa\u4e86\uff0c\u4f46\u8981\u7b49\u52308\u6708\u4efd\u624d\u62db\u751f\uff09\uff0c\u90a3\u4e48\u662f\u65e0\u6cd5\u5c06\u7cfb\u540d\u4e0e\u7cfb\u4e3b\u4efb\u7684\u6570\u636e\u5355\u72ec\u5730\u6dfb\u52a0\u5230\u6570\u636e\u8868\u4e2d\u53bb\u7684 \uff08\u6ce8\uff11\uff09\u2014\u2014<b>\u63d2\u5165\u5f02\u5e38<\/b>\n<p>\u6ce8\uff11\uff1a\u6839\u636e\u4e09\u79cd\u5173\u7cfb\u5b8c\u6574\u6027\u7ea6\u675f\u4e2d\u5b9e\u4f53\u5b8c\u6574\u6027\u7684\u8981\u6c42\uff0c\u5173\u7cfb\u4e2d\u7684\u7801\uff08\u6ce8\uff12\uff09\u6240\u5305\u542b\u7684\u4efb\u610f\u4e00\u4e2a\u5c5e\u6027\u90fd\u4e0d\u80fd\u4e3a\u7a7a\uff0c\u6240\u6709\u5c5e\u6027\u7684\u7ec4\u5408\u4e5f\u4e0d\u80fd\u91cd\u590d\u3002\u4e3a\u4e86\u6ee1\u8db3\u6b64\u8981\u6c42\uff0c\u56fe\u4e2d\u7684\u8868\uff0c\u53ea\u80fd\u5c06\u5b66\u53f7\u4e0e\u8bfe\u540d\u7684\u7ec4\u5408\u4f5c\u4e3a\u7801\uff0c\u5426\u5219\u5c31\u65e0\u6cd5\u552f\u4e00\u5730\u533a\u5206\u6bcf\u4e00\u6761\u8bb0\u5f55\u3002<\/p>\n<p>\u6ce8\uff12\uff1a<b>\u7801\uff1a\u5173\u7cfb\u4e2d\u7684\u67d0\u4e2a\u5c5e\u6027\u6216\u8005\u67d0\u51e0\u4e2a\u5c5e\u6027\u7684\u7ec4\u5408\uff0c\u7528\u4e8e\u533a\u5206\u6bcf\u4e2a\u5143\u7ec4<\/b>\uff08\u53ef\u4ee5\u628a\u201c\u5143\u7ec4\u201d\u7406\u89e3\u4e3a\u4e00\u5f20\u8868\u4e2d\u7684\u6bcf\u6761\u8bb0\u5f55\uff0c\u4e5f\u5c31\u662f\u6bcf\u4e00\u884c\uff09<b>\u3002<\/b><\/li>\n<li>\u5047\u5982\u5c06\u67d0\u4e2a\u7cfb\u4e2d\u6240\u6709\u5b66\u751f\u76f8\u5173\u7684\u8bb0\u5f55\u90fd\u5220\u9664\uff0c\u90a3\u4e48\u6240\u6709\u7cfb\u4e0e\u7cfb\u4e3b\u4efb\u7684\u6570\u636e\u4e5f\u5c31\u968f\u4e4b\u6d88\u5931\u4e86\uff08\u4e00\u4e2a\u7cfb\u6240\u6709\u5b66\u751f\u90fd\u6ca1\u6709\u4e86\uff0c\u5e76\u4e0d\u8868\u793a\u8fd9\u4e2a\u7cfb\u5c31\u6ca1\u6709\u4e86\uff09\u3002\u2014\u2014<b>\u5220\u9664\u5f02\u5e38<\/b><\/li>\n<li>\u5047\u5982\u674e\u5c0f\u660e\u8f6c\u7cfb\u5230\u6cd5\u5f8b\u7cfb\uff0c\u90a3\u4e48\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u5e93\u4e2d\u6570\u636e\u7684\u4e00\u81f4\u6027\uff0c\u9700\u8981\u4fee\u6539\u4e09\u6761\u8bb0\u5f55\u4e2d\u7cfb\u4e0e\u7cfb\u4e3b\u4efb\u7684\u6570\u636e\u3002\u2014\u2014<b>\u4fee\u6539\u5f02\u5e38<\/b>\u3002<\/li>\n<\/ol>\n<p>\u6b63\u56e0\u4e3a\u4ec5\u7b26\u54081NF\u7684\u6570\u636e\u5e93\u8bbe\u8ba1\u5b58\u5728\u7740\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u6211\u4eec\u9700\u8981\u63d0\u9ad8\u8bbe\u8ba1\u6807\u51c6\uff0c\u53bb\u6389\u5bfc\u81f4\u4e0a\u8ff0\u56db\u79cd\u95ee\u9898\u7684\u56e0\u7d20\uff0c\u4f7f\u5176\u7b26\u5408\u66f4\u9ad8\u4e00\u7ea7\u7684\u8303\u5f0f\uff082NF\uff09\uff0c\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u201c\u89c4\u8303\u5316\u201d\u3002<\/p>\n<p><b>\u7b2c\u4e8c\u8303\u5f0f\uff082NF\uff09<\/b>\u5728\u5173\u7cfb\u7406\u8bba\u4e2d\u7684\u4e25\u683c\u5b9a\u4e49\u6211\u8fd9\u91cc\u5c31\u4e0d\u591a\u4ecb\u7ecd\u4e86\uff08\u56e0\u4e3a\u6d89\u53ca\u5230\u7684\u94fa\u57ab\u6bd4\u8f83\u591a\uff09\uff0c\u53ea\u9700\u8981\u4e86\u89e32NF\u5bf91NF\u8fdb\u884c\u4e86\u54ea\u4e9b\u6539\u8fdb\u5373\u53ef\u3002\u5176\u6539\u8fdb\u662f\uff0c<b>2NF\u57281NF\u7684\u57fa\u7840\u4e4b\u4e0a\uff0c\u6d88\u9664\u4e86\u975e\u4e3b\u5c5e\u6027\u5bf9\u4e8e\u7801\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56<\/b>\u3002\u63a5\u4e0b\u6765\u5bf9\u8fd9\u53e5\u8bdd\u4e2d\u6d89\u53ca\u5230\u7684\u56db\u4e2a\u6982\u5ff5\u2014\u2014<b>\u201c\u51fd\u6570\u4f9d\u8d56\u201d<\/b>\u3001<b>\u201c\u7801\u201d<\/b>\u3001<b>\u201c\u975e\u4e3b\u5c5e\u6027\u201d<\/b>\u3001\u4e0e<b>\u201c\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\u201d<\/b>\u8fdb\u884c\u4e00\u4e0b\u89e3\u91ca\u3002<\/p>\n<p><b>\u51fd\u6570\u4f9d\u8d56<\/b><br \/>\n\u6211\u4eec\u53ef\u4ee5\u8fd9\u4e48\u7406\u89e3\uff08\u4f46\u5e76\u4e0d\u662f\u7279\u522b\u4e25\u683c\u7684\u5b9a\u4e49\uff09\uff1a<b>\u82e5\u5728\u4e00\u5f20\u8868\u4e2d\uff0c\u5728\u5c5e\u6027\uff08\u6216\u5c5e\u6027\u7ec4\uff09X\u7684\u503c\u786e\u5b9a\u7684\u60c5\u51b5\u4e0b\uff0c\u5fc5\u5b9a\u80fd\u786e\u5b9a\u5c5e\u6027Y\u7684\u503c\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u8bf4Y\u51fd\u6570\u4f9d\u8d56\u4e8eX\uff0c\u5199\u4f5c X \u2192 Y<\/b>\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u6570\u636e\u8868\u4e2d\uff0c\u4e0d\u5b58\u5728\u4efb\u610f\u4e24\u6761\u8bb0\u5f55\uff0c\u5b83\u4eec\u5728X\u5c5e\u6027\uff08\u6216\u5c5e\u6027\u7ec4\uff09\u4e0a\u7684\u503c\u76f8\u540c\uff0c\u800c\u5728Y\u5c5e\u6027\u4e0a\u7684\u503c\u4e0d\u540c\u3002\u8fd9\u4e5f\u5c31\u662f\u201c\u51fd\u6570\u4f9d\u8d56\u201d\u540d\u5b57\u7684\u7531\u6765\uff0c\u7c7b\u4f3c\u4e8e\u51fd\u6570\u5173\u7cfb y = f(x)\uff0c\u5728x\u7684\u503c\u786e\u5b9a\u7684\u60c5\u51b5\u4e0b\uff0cy\u7684\u503c\u4e00\u5b9a\u662f\u786e\u5b9a\u7684\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5bf9\u4e8e\u88683\u4e2d\u7684\u6570\u636e\uff0c\u627e\u4e0d\u5230\u4efb\u4f55\u4e00\u6761\u8bb0\u5f55\uff0c\u5b83\u4eec\u7684\u5b66\u53f7\u76f8\u540c\u800c\u5bf9\u5e94\u7684\u59d3\u540d\u4e0d\u540c\u3002\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u8bf4<b>\u59d3\u540d\u51fd\u6570\u4f9d\u8d56\u4e8e\u5b66\u53f7<\/b>\uff0c\u5199\u4f5c <b>\u5b66\u53f7 \u2192 \u59d3\u540d<\/b>\u3002\u4f46\u662f\u53cd\u8fc7\u6765\uff0c\u56e0\u4e3a\u53ef\u80fd\u51fa\u73b0\u540c\u540d\u7684\u5b66\u751f\uff0c\u6240\u4ee5\u6709\u53ef\u80fd\u4e0d\u540c\u7684\u4e24\u6761\u5b66\u751f\u8bb0\u5f55\uff0c\u5b83\u4eec\u5728\u59d3\u540d\u4e0a\u7684\u503c\u76f8\u540c\uff0c\u4f46\u5bf9\u5e94\u7684\u5b66\u53f7\u4e0d\u540c\uff0c\u6240\u4ee5\u6211\u4eec\u4e0d\u80fd\u8bf4\u5b66\u53f7\u51fd\u6570\u4f9d\u8d56\u4e8e\u59d3\u540d\u3002\u8868\u4e2d\u5176\u4ed6\u7684\u51fd\u6570\u4f9d\u8d56\u5173\u7cfb\u8fd8\u6709\u5982\uff1a<\/p>\n<ul>\n<li>\u7cfb\u540d \u2192 \u7cfb\u4e3b\u4efb<\/li>\n<li>\u5b66\u53f7 \u2192 \u7cfb\u4e3b\u4efb<\/li>\n<li>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09 \u2192 \u5206\u6570<\/li>\n<\/ul>\n<p>\u4f46\u4ee5\u4e0b\u51fd\u6570\u4f9d\u8d56\u5173\u7cfb\u5219\u4e0d\u6210\u7acb\uff1a<\/p>\n<ul>\n<li>\u5b66\u53f7 \u2192 \u8bfe\u540d<\/li>\n<li>\u5b66\u53f7 \u2192 \u5206\u6570<\/li>\n<li>\u8bfe\u540d \u2192 \u7cfb\u4e3b\u4efb<\/li>\n<li>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09 \u2192 \u59d3\u540d<\/li>\n<\/ul>\n<p>\u4ece\u201c\u51fd\u6570\u4f9d\u8d56\u201d\u8fd9\u4e2a\u6982\u5ff5\u5c55\u5f00\uff0c\u8fd8\u4f1a\u6709\u4e09\u4e2a\u6982\u5ff5\uff1a<\/p>\n<p><b>\u5b8c\u5168\u51fd\u6570\u4f9d\u8d56<\/b><\/p>\n<p>\u5728\u4e00\u5f20\u8868\u4e2d\uff0c\u82e5 X \u2192 Y\uff0c\u4e14\u5bf9\u4e8e X \u7684\u4efb\u4f55\u4e00\u4e2a\u771f\u5b50\u96c6\uff08\u5047\u5982\u5c5e\u6027\u7ec4 X \u5305\u542b\u8d85\u8fc7\u4e00\u4e2a\u5c5e\u6027\u7684\u8bdd\uff09\uff0cX &#8216; \u2192 Y \u4e0d\u6210\u7acb\uff0c\u90a3\u4e48\u6211\u4eec\u79f0 Y \u5bf9\u4e8e X <b>\u5b8c\u5168\u51fd\u6570\u4f9d\u8d56<\/b>\uff0c\u8bb0\u4f5c X F\u2192 Y\u3002\uff08\u90a3\u4e2aF\u5e94\u8be5\u5199\u5728\u7bad\u5934\u7684\u6b63\u4e0a\u65b9\uff0c\u6ca1\u529e\u6cd5\u6253\u51fa\u6765\u2026\u2026\uff0c\u6b63\u786e\u7684\u5199\u6cd5\u5982<b>\u56fe1<\/b>\uff09<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/50\/12513de20079d12b99d946072df7311a_hd.jpg\" data-caption=\"\" data-rawwidth=\"98\" data-rawheight=\"53\" class=\"content_image\" width=\"98\"\/><\/noscript><img decoding=\"async\" class=\"content_image lazy\" src=\"https:\/\/pic2.zhimg.com\/80\/12513de20079d12b99d946072df7311a_hd.jpg\" width=\"98\" data-caption=\"\" data-rawwidth=\"98\" data-rawheight=\"53\" data-actualsrc=\"https:\/\/pic2.zhimg.com\/50\/12513de20079d12b99d946072df7311a_hd.jpg\" \/><\/figure>\n<p>\u56fe1<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u5b66\u53f7 F\u2192 \u59d3\u540d<\/li>\n<li>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09 F\u2192 \u5206\u6570 \uff08\u6ce8\uff1a\u56e0\u4e3a\u540c\u4e00\u4e2a\u7684\u5b66\u53f7\u5bf9\u5e94\u7684\u5206\u6570\u4e0d\u786e\u5b9a\uff0c\u540c\u4e00\u4e2a\u8bfe\u540d\u5bf9\u5e94\u7684\u5206\u6570\u4e5f\u4e0d\u786e\u5b9a\uff09<\/li>\n<\/ul>\n<p><b>\u90e8\u5206\u51fd\u6570\u4f9d\u8d56<\/b><\/p>\n<p>\u5047\u5982 Y \u51fd\u6570\u4f9d\u8d56\u4e8e X\uff0c\u4f46\u540c\u65f6 Y \u5e76\u4e0d\u5b8c\u5168\u51fd\u6570\u4f9d\u8d56\u4e8e X\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u79f0 Y \u90e8\u5206\u51fd\u6570\u4f9d\u8d56\u4e8e X\uff0c\u8bb0\u4f5c X P\u2192 Y\uff0c\u5982<b>\u56fe2<\/b>\u3002<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/50\/10b52b39b18b8ea9fb17b46babf4d20f_hd.jpg\" data-caption=\"\" data-rawwidth=\"99\" data-rawheight=\"62\" class=\"content_image\" width=\"99\"\/><\/noscript><img decoding=\"async\" class=\"content_image lazy\" src=\"https:\/\/pic2.zhimg.com\/80\/10b52b39b18b8ea9fb17b46babf4d20f_hd.jpg\" width=\"99\" data-caption=\"\" data-rawwidth=\"99\" data-rawheight=\"62\" data-actualsrc=\"https:\/\/pic2.zhimg.com\/50\/10b52b39b18b8ea9fb17b46babf4d20f_hd.jpg\" \/><\/figure>\n<p>\u56fe2<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09 P\u2192 \u59d3\u540d<\/li>\n<\/ul>\n<p><b>\u4f20\u9012\u51fd\u6570\u4f9d\u8d56<\/b><br \/>\n\u5047\u5982 Z \u51fd\u6570\u4f9d\u8d56\u4e8e Y\uff0c\u4e14 Y \u51fd\u6570\u4f9d\u8d56\u4e8e X \uff08\u611f\u8c22<\/p>\n<div class=\"Popover\">\n<div id=\"Popover21-toggle\" aria-haspopup=\"true\" aria-expanded=\"false\" aria-owns=\"Popover21-content\"><a class=\"UserLink-link\" href=\"\/\/www.zhihu.com\/people\/cd70559bf6f5073e39a22d98a805f3b6\" target=\"_blank\" rel=\"noopener noreferrer\" data-za-detail-view-element_name=\"User\" data-za-detail-view-id=\"1045\">@\u767e\u8fbe<\/a><\/div>\n<\/div>\n<p>\u6307\u51fa\u7684\u9519\u8bef\uff0c\u8fd9\u91cc\u6539\u4e3a\uff1a\u300eY \u4e0d\u5305\u542b\u4e8e X\uff0c\u4e14 X \u4e0d\u51fd\u6570\u4f9d\u8d56\u4e8e Y\u300f\u8fd9\u4e2a\u524d\u63d0\uff09\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u79f0 Z \u4f20\u9012\u51fd\u6570\u4f9d\u8d56\u4e8e X \uff0c\u8bb0\u4f5c X T\u2192 Z\uff0c\u5982<b>\u56fe3<\/b>\u3002<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/50\/51f8105fbbe92adaa3e343ea2db3bf49_hd.jpg\" data-caption=\"\" data-rawwidth=\"124\" data-rawheight=\"77\" class=\"content_image\" width=\"124\"\/><\/noscript><img decoding=\"async\" class=\"content_image lazy\" src=\"https:\/\/pic2.zhimg.com\/80\/51f8105fbbe92adaa3e343ea2db3bf49_hd.jpg\" width=\"124\" data-caption=\"\" data-rawwidth=\"124\" data-rawheight=\"77\" data-actualsrc=\"https:\/\/pic2.zhimg.com\/50\/51f8105fbbe92adaa3e343ea2db3bf49_hd.jpg\" \/><\/figure>\n<p>\u56fe3<\/p>\n<p><b>\u7801<\/b><br \/>\n\u8bbe K \u4e3a\u67d0\u8868\u4e2d\u7684\u4e00\u4e2a\u5c5e\u6027\u6216\u5c5e\u6027\u7ec4\uff0c\u82e5\u9664 K \u4e4b\u5916\u7684\u6240\u6709\u5c5e\u6027\u90fd\u5b8c\u5168\u51fd\u6570\u4f9d\u8d56\u4e8e K\uff08\u8fd9\u4e2a\u201c\u5b8c\u5168\u201d\u4e0d\u8981\u6f0f\u4e86\uff09\uff0c\u90a3\u4e48\u6211\u4eec\u79f0 K \u4e3a<b>\u5019\u9009\u7801<\/b>\uff0c\u7b80\u79f0\u4e3a<b>\u7801<\/b>\u3002\u5728\u5b9e\u9645\u4e2d\u6211\u4eec\u901a\u5e38\u53ef\u4ee5\u7406\u89e3\u4e3a\uff1a<b>\u5047\u5982\u5f53 K \u786e\u5b9a\u7684\u60c5\u51b5\u4e0b\uff0c\u8be5\u8868\u9664 K \u4e4b\u5916\u7684\u6240\u6709\u5c5e\u6027\u7684\u503c\u4e5f\u5c31\u968f\u4e4b\u786e\u5b9a\uff0c\u90a3\u4e48 K \u5c31\u662f\u7801\u3002<\/b>\u4e00\u5f20\u8868\u4e2d\u53ef\u4ee5\u6709\u8d85\u8fc7\u4e00\u4e2a\u7801\u3002\uff08\u5b9e\u9645\u5e94\u7528\u4e2d\u4e3a\u4e86\u65b9\u4fbf\uff0c\u901a\u5e38\u9009\u62e9\u5176\u4e2d\u7684\u4e00\u4e2a\u7801\u4f5c\u4e3a<b>\u4e3b\u7801<\/b>\uff09<\/p>\n<p>\u4f8b\u5982\uff1a<br \/>\n\u5bf9\u4e8e\u88683\uff0c<b>\uff08\u5b66\u53f7\u3001\u8bfe\u540d\uff09<\/b>\u8fd9\u4e2a\u5c5e\u6027\u7ec4\u5c31\u662f\u7801\u3002\u8be5\u8868\u4e2d\u6709\u4e14\u4ec5\u6709\u8fd9\u4e00\u4e2a\u7801\u3002\uff08\u5047\u8bbe\u6240\u6709\u8bfe\u6ca1\u6709\u91cd\u540d\u7684\u60c5\u51b5\uff09<\/p>\n<p><b>\u975e\u4e3b\u5c5e\u6027<\/b><br \/>\n\u5305\u542b\u5728\u4efb\u4f55\u4e00\u4e2a\u7801\u4e2d\u7684\u5c5e\u6027\u6210\u4e3a\u4e3b\u5c5e\u6027\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<br \/>\n\u5bf9\u4e8e\u88683\uff0c\u4e3b\u5c5e\u6027\u5c31\u6709\u4e24\u4e2a\uff0c<b>\u5b66\u53f7<\/b> \u4e0e <b>\u8bfe\u540d<\/b>\u3002<\/p>\n<p>\u7ec8\u4e8e\u53ef\u4ee5\u56de\u8fc7\u6765\u770b2NF\u4e86\u3002\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u5224\u65ad\uff0c\u88683\u662f\u5426\u7b26\u54082NF\u7684\u8981\u6c42\uff1f\u6839\u636e2NF\u7684\u5b9a\u4e49\uff0c\u5224\u65ad\u7684\u4f9d\u636e\u5b9e\u9645\u4e0a\u5c31\u662f\u770b\u6570\u636e\u8868\u4e2d<b>\u662f\u5426\u5b58\u5728\u975e\u4e3b\u5c5e\u6027\u5bf9\u4e8e\u7801\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56<\/b>\u3002\u82e5\u5b58\u5728\uff0c\u5219\u6570\u636e\u8868\u6700\u9ad8\u53ea\u7b26\u54081NF\u7684\u8981\u6c42\uff0c\u82e5\u4e0d\u5b58\u5728\uff0c\u5219\u7b26\u54082NF\u7684\u8981\u6c42\u3002\u5224\u65ad\u7684\u65b9\u6cd5\u662f\uff1a<\/p>\n<p>\u7b2c\u4e00\u6b65\uff1a\u627e\u51fa\u6570\u636e\u8868\u4e2d\u6240\u6709\u7684<b>\u7801<\/b>\u3002<br \/>\n\u7b2c\u4e8c\u6b65\uff1a\u6839\u636e\u7b2c\u4e00\u6b65\u6240\u5f97\u5230\u7684\u7801\uff0c\u627e\u51fa\u6240\u6709\u7684<b>\u4e3b\u5c5e\u6027<\/b>\u3002<br \/>\n\u7b2c\u4e09\u6b65\uff1a\u6570\u636e\u8868\u4e2d\uff0c\u9664\u53bb\u6240\u6709\u7684\u4e3b\u5c5e\u6027\uff0c\u5269\u4e0b\u7684\u5c31\u90fd\u662f<b>\u975e\u4e3b\u5c5e\u6027<\/b>\u4e86\u3002<br \/>\n\u7b2c\u56db\u6b65\uff1a\u67e5\u770b\u662f\u5426\u5b58\u5728\u975e\u4e3b\u5c5e\u6027\u5bf9\u7801\u7684<b>\u90e8\u5206\u51fd\u6570\u4f9d\u8d56<\/b>\u3002<\/p>\n<p>\u5bf9\u4e8e\u88683\uff0c\u6839\u636e\u524d\u9762\u6240\u8bf4\u7684\u56db\u6b65\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u4e48\u505a\uff1a<\/p>\n<p>\u7b2c\u4e00\u6b65\uff1a<\/p>\n<ol>\n<li>\u67e5\u770b\u6240\u6709\u6bcf\u4e00\u5355\u4e2a\u5c5e\u6027\uff0c\u5f53\u5b83\u7684\u503c\u786e\u5b9a\u4e86\uff0c\u662f\u5426\u5269\u4e0b\u7684\u6240\u6709\u5c5e\u6027\u503c\u90fd\u80fd\u786e\u5b9a\u3002<\/li>\n<li>\u67e5\u770b\u6240\u6709\u5305\u542b\u6709\u4e24\u4e2a\u5c5e\u6027\u7684\u5c5e\u6027\u7ec4\uff0c\u5f53\u5b83\u7684\u503c\u786e\u5b9a\u4e86\uff0c\u662f\u5426\u5269\u4e0b\u7684\u6240\u6709\u5c5e\u6027\u503c\u90fd\u80fd\u786e\u5b9a\u3002<\/li>\n<li>\u2026\u2026<\/li>\n<li>\u67e5\u770b\u6240\u6709\u5305\u542b\u4e86\u516d\u4e2a\u5c5e\u6027\uff0c\u4e5f\u5c31\u662f\u6240\u6709\u5c5e\u6027\u7684\u5c5e\u6027\u7ec4\uff0c\u5f53\u5b83\u7684\u503c\u786e\u5b9a\u4e86\uff0c\u662f\u5426\u5269\u4e0b\u7684\u6240\u6709\u5c5e\u6027\u503c\u90fd\u80fd\u786e\u5b9a\u3002<\/li>\n<\/ol>\n<p>\u770b\u8d77\u6765\u5f88\u9ebb\u70e6\u662f\u5427\uff0c\u4f46\u662f\u8fd9\u91cc\u6709\u4e00\u4e2a\u8bc0\u7a8d\uff0c\u5c31\u662f\u5047\u5982A\u662f\u7801\uff0c\u90a3\u4e48\u6240\u6709\u5305\u542b\u4e86A\u7684\u5c5e\u6027\u7ec4\uff0c\u5982\uff08A\uff0cB\uff09\u3001\uff08A\uff0cC\uff09\u3001\uff08A\uff0cB\uff0cC\uff09\u7b49\u7b49\uff0c\u90fd\u4e0d\u662f\u7801\u4e86\uff08\u56e0\u4e3a\u4f5c\u4e3a\u7801\u7684\u8981\u6c42\u91cc\u6709\u4e00\u4e2a\u201c<b>\u5b8c\u5168<\/b>\u51fd\u6570\u4f9d\u8d56\u201d\uff09\u3002<\/p>\n<p><b>\u56fe4<\/b>\u8868\u793a\u4e86\u8868\u4e2d\u6240\u6709\u7684\u51fd\u6570\u4f9d\u8d56\u5173\u7cfb\uff1a<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/50\/51e2689ac9416a91800e63101bee9db7_hd.jpg\" data-caption=\"\" data-rawwidth=\"541\" data-rawheight=\"212\" class=\"origin_image zh-lightbox-thumb\" width=\"541\" data-original=\"https:\/\/pic3.zhimg.com\/51e2689ac9416a91800e63101bee9db7_r.jpg\"\/><\/noscript><img decoding=\"async\" class=\"origin_image zh-lightbox-thumb lazy\" src=\"https:\/\/pic3.zhimg.com\/80\/51e2689ac9416a91800e63101bee9db7_hd.jpg\" width=\"541\" data-caption=\"\" data-rawwidth=\"541\" data-rawheight=\"212\" data-original=\"https:\/\/pic3.zhimg.com\/51e2689ac9416a91800e63101bee9db7_r.jpg\" data-actualsrc=\"https:\/\/pic3.zhimg.com\/50\/51e2689ac9416a91800e63101bee9db7_hd.jpg\" \/><\/figure>\n<p>\u56fe4<\/p>\n<p>\u8fd9\u4e00\u6b65\u5b8c\u6210\u4ee5\u540e\uff0c\u53ef\u4ee5\u5f97\u5230\uff0c\u88683\u7684\u7801\u53ea\u6709\u4e00\u4e2a\uff0c\u5c31\u662f<b>\uff08\u5b66\u53f7\u3001\u8bfe\u540d\uff09<\/b>\u3002<\/p>\n<p>\u7b2c\u4e8c\u6b65\uff1a<br \/>\n\u4e3b\u5c5e\u6027\u6709\u4e24\u4e2a\uff1a<b>\u5b66\u53f7 <\/b>\u4e0e<b> \u8bfe\u540d<\/b><\/p>\n<p>\u7b2c\u4e09\u6b65\uff1a<br \/>\n\u975e\u4e3b\u5c5e\u6027\u6709\u56db\u4e2a\uff1a<b>\u59d3\u540d<\/b>\u3001<b>\u7cfb\u540d<\/b>\u3001<b>\u7cfb\u4e3b\u4efb<\/b>\u3001<b>\u5206\u6570<\/b><\/p>\n<p><b>\u7b2c\u56db\u6b65\uff1a<\/b><br \/>\n\u5bf9\u4e8e<b>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09 \u2192 \u59d3\u540d<\/b>\uff0c\u6709 <b>\u5b66\u53f7 \u2192 \u59d3\u540d<\/b>\uff0c\u5b58\u5728\u975e\u4e3b\u5c5e\u6027 <b>\u59d3\u540d <\/b>\u5bf9\u7801<b>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09<\/b>\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\u3002<br \/>\n\u5bf9\u4e8e<b>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09 \u2192 \u7cfb\u540d<\/b>\uff0c\u6709 <b>\u5b66\u53f7 \u2192 \u7cfb\u540d<\/b>\uff0c\u5b58\u5728\u975e\u4e3b\u5c5e\u6027 \u7cfb<b>\u540d <\/b>\u5bf9\u7801<b>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09<\/b>\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\u3002<br \/>\n\u5bf9\u4e8e<b>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09 \u2192 \u7cfb\u4e3b\u4efb<\/b>\uff0c\u6709 <b>\u5b66\u53f7 \u2192 \u7cfb\u4e3b\u4efb<\/b>\uff0c\u5b58\u5728\u975e\u4e3b\u5c5e\u6027 \u5bf9\u7801<b>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09<\/b>\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\u3002<\/p>\n<p>\u6240\u4ee5\u88683\u5b58\u5728\u975e\u4e3b\u5c5e\u6027\u5bf9\u4e8e\u7801\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\uff0c\u6700\u9ad8\u53ea\u7b26\u54081NF\u7684\u8981\u6c42\uff0c\u4e0d\u7b26\u54082NF\u7684\u8981\u6c42\u3002<\/p>\n<p>\u4e3a\u4e86\u8ba9\u88683\u7b26\u54082NF\u7684\u8981\u6c42\uff0c\u6211\u4eec\u5fc5\u987b\u6d88\u9664\u8fd9\u4e9b\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\uff0c\u53ea\u6709\u4e00\u4e2a\u529e\u6cd5\uff0c\u5c31\u662f\u5c06\u5927\u6570\u636e\u8868\u62c6\u5206\u6210\u4e24\u4e2a\u6216\u8005\u66f4\u591a\u4e2a\u66f4\u5c0f\u7684\u6570\u636e\u8868\uff0c\u5728\u62c6\u5206\u7684\u8fc7\u7a0b\u4e2d\uff0c\u8981\u8fbe\u5230\u66f4\u9ad8\u4e00\u7ea7\u8303\u5f0f\u7684\u8981\u6c42\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u53eb\u505a\u201d\u6a21\u5f0f\u5206\u89e3\u201c\u3002\u6a21\u5f0f\u5206\u89e3\u7684\u65b9\u6cd5\u4e0d\u662f\u552f\u4e00\u7684\uff0c\u4ee5\u4e0b\u662f\u5176\u4e2d\u4e00\u79cd\u65b9\u6cd5\uff1a<br \/>\n\u9009\u8bfe\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff0c\u5206\u6570\uff09<br \/>\n\u5b66\u751f\uff08\u5b66\u53f7\uff0c\u59d3\u540d\uff0c\u7cfb\u540d\uff0c\u7cfb\u4e3b\u4efb\uff09<\/p>\n<p>\u6211\u4eec\u5148\u6765\u5224\u65ad\u4ee5\u4e0b\uff0c<b>\u9009\u8bfe<\/b>\u8868\u4e0e<b>\u5b66\u751f<\/b>\u8868\uff0c\u662f\u5426\u7b26\u5408\u4e862NF\u7684\u8981\u6c42\uff1f<\/p>\n<p>\u5bf9\u4e8e<b>\u9009\u8bfe<\/b>\u8868\uff0c\u5176\u7801\u662f<b>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09<\/b>\uff0c\u4e3b\u5c5e\u6027\u662f<b>\u5b66\u53f7<\/b>\u548c<b>\u8bfe\u540d<\/b>\uff0c\u975e\u4e3b\u5c5e\u6027\u662f<b>\u5206\u6570<\/b>\uff0c<b>\u5b66\u53f7<\/b>\u786e\u5b9a\uff0c\u5e76\u4e0d\u80fd\u552f\u4e00\u786e\u5b9a<b>\u5206\u6570<\/b>\uff0c<b>\u8bfe\u540d<\/b>\u786e\u5b9a\uff0c\u4e5f\u4e0d\u80fd\u552f\u4e00\u786e\u5b9a<b>\u5206\u6570<\/b>\uff0c\u6240\u4ee5\u4e0d\u5b58\u5728\u975e\u4e3b\u5c5e\u6027<b>\u5206\u6570<\/b>\u5bf9\u4e8e\u7801 <b>\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09<\/b>\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\uff0c\u6240\u4ee5\u6b64\u8868\u7b26\u54082NF\u7684\u8981\u6c42\u3002<\/p>\n<p>\u5bf9\u4e8e<b>\u5b66\u751f<\/b>\u8868\uff0c\u5176\u7801\u662f<b>\u5b66\u53f7\uff0c<\/b>\u4e3b\u5c5e\u6027\u662f<b>\u5b66\u53f7<\/b>\uff0c\u975e\u4e3b\u5c5e\u6027\u662f<b>\u59d3\u540d\u3001\u7cfb\u540d<\/b>\u548c<b>\u7cfb\u4e3b\u4efb<\/b>\uff0c\u56e0\u4e3a\u7801\u53ea\u6709\u4e00\u4e2a\u5c5e\u6027\uff0c\u6240\u4ee5\u4e0d\u53ef\u80fd\u5b58\u5728\u975e\u4e3b\u5c5e\u6027\u5bf9\u4e8e\u7801 \u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\uff0c\u6240\u4ee5\u6b64\u8868\u7b26\u54082NF\u7684\u8981\u6c42\u3002<\/p>\n<p><b>\u56fe5<\/b>\u8868\u793a\u4e86\u6a21\u5f0f\u5206\u89e3\u4ee5\u540e\u7684\u65b0\u7684\u51fd\u6570\u4f9d\u8d56\u5173\u7cfb<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/50\/2f4b4a887f6a61674a49d03d79e3fe17_hd.jpg\" data-caption=\"\" data-rawwidth=\"961\" data-rawheight=\"467\" class=\"origin_image zh-lightbox-thumb\" width=\"961\" data-original=\"https:\/\/pic4.zhimg.com\/2f4b4a887f6a61674a49d03d79e3fe17_r.jpg\"\/><\/noscript><img decoding=\"async\" class=\"origin_image zh-lightbox-thumb lazy\" src=\"https:\/\/pic4.zhimg.com\/80\/2f4b4a887f6a61674a49d03d79e3fe17_hd.jpg\" width=\"961\" data-caption=\"\" data-rawwidth=\"961\" data-rawheight=\"467\" data-original=\"https:\/\/pic4.zhimg.com\/2f4b4a887f6a61674a49d03d79e3fe17_r.jpg\" data-actualsrc=\"https:\/\/pic4.zhimg.com\/50\/2f4b4a887f6a61674a49d03d79e3fe17_hd.jpg\" \/><\/figure>\n<p>\u56fe5<\/p>\n<p>\u88684\u8868\u793a\u4e86\u6a21\u5f0f\u5206\u89e3\u4ee5\u540e\u65b0\u7684\u6570\u636e<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/50\/44af74509a4e21372ed372be8560539d_hd.jpg\" data-caption=\"\" data-rawwidth=\"478\" data-rawheight=\"314\" class=\"origin_image zh-lightbox-thumb\" width=\"478\" data-original=\"https:\/\/pic4.zhimg.com\/44af74509a4e21372ed372be8560539d_r.jpg\"\/><\/noscript><img decoding=\"async\" class=\"origin_image zh-lightbox-thumb lazy\" src=\"https:\/\/pic4.zhimg.com\/80\/44af74509a4e21372ed372be8560539d_hd.jpg\" width=\"478\" data-caption=\"\" data-rawwidth=\"478\" data-rawheight=\"314\" data-original=\"https:\/\/pic4.zhimg.com\/44af74509a4e21372ed372be8560539d_r.jpg\" data-actualsrc=\"https:\/\/pic4.zhimg.com\/50\/44af74509a4e21372ed372be8560539d_hd.jpg\" \/><\/figure>\n<p>\u88684<\/p>\n<p>\uff08\u8fd9\u91cc\u8fd8\u6d89\u53ca\u5230\u4e00\u4e2a\u5982\u4f55\u8fdb\u884c\u6a21\u5f0f\u5206\u89e3\u624d\u662f\u6b63\u786e\u7684\u77e5\u8bc6\u70b9\uff0c\u5148\u4e0d\u4ecb\u7ecd\u4e86\uff09<\/p>\n<p>\u73b0\u5728\u6211\u4eec\u6765\u770b\u4e00\u4e0b\uff0c\u8fdb\u884c\u540c\u6837\u7684\u64cd\u4f5c\uff0c\u662f\u5426\u8fd8\u5b58\u5728\u7740\u4e4b\u524d\u7684\u90a3\u4e9b\u95ee\u9898\uff1f<\/p>\n<ol>\n<li>\u674e\u5c0f\u660e\u8f6c\u7cfb\u5230\u6cd5\u5f8b\u7cfb<br \/>\n\u53ea\u9700\u8981\u4fee\u6539\u4e00\u6b21\u674e\u5c0f\u660e\u5bf9\u5e94\u7684\u7cfb\u7684\u503c\u5373\u53ef\u3002\u2014\u2014\u6709\u6539\u8fdb<\/li>\n<li>\u6570\u636e\u5197\u4f59\u662f\u5426\u51cf\u5c11\u4e86\uff1f<br \/>\n\u5b66\u751f\u7684\u59d3\u540d\u3001\u7cfb\u540d\u4e0e\u7cfb\u4e3b\u4efb\uff0c\u4e0d\u518d\u50cf\u4e4b\u524d\u4e00\u6837\u91cd\u590d\u90a3\u4e48\u591a\u6b21\u4e86\u3002\u2014\u2014\u6709\u6539\u8fdb<\/li>\n<li>\u5220\u9664\u67d0\u4e2a\u7cfb\u4e2d\u6240\u6709\u7684\u5b66\u751f\u8bb0\u5f55<br \/>\n\u8be5\u7cfb\u7684\u4fe1\u606f\u4ecd\u7136\u5168\u90e8\u4e22\u5931\u3002\u2014\u2014\u65e0\u6539\u8fdb<\/li>\n<li>\u63d2\u5165\u4e00\u4e2a\u5c1a\u65e0\u5b66\u751f\u7684\u65b0\u7cfb\u7684\u4fe1\u606f\u3002<br \/>\n\u56e0\u4e3a\u5b66\u751f\u8868\u7684\u7801\u662f\u5b66\u53f7\uff0c\u4e0d\u80fd\u4e3a\u7a7a\uff0c\u6240\u4ee5\u6b64\u64cd\u4f5c\u4e0d\u88ab\u5141\u8bb8\u3002\u2014\u2014\u65e0\u6539\u8fdb<\/li>\n<\/ol>\n<p>\u6240\u4ee5\u8bf4\uff0c\u4ec5\u4ec5\u7b26\u54082NF\u7684\u8981\u6c42\uff0c\u5f88\u591a\u60c5\u51b5\u4e0b\u8fd8\u662f\u4e0d\u591f\u7684\uff0c\u800c\u51fa\u73b0\u95ee\u9898\u7684\u539f\u56e0\uff0c\u5728\u4e8e\u4ecd\u7136\u5b58\u5728\u975e\u4e3b\u5c5e\u6027<b>\u7cfb\u4e3b\u4efb<\/b>\u5bf9\u4e8e\u7801<b>\u5b66\u53f7<\/b>\u7684\u4f20\u9012\u51fd\u6570\u4f9d\u8d56\u3002\u4e3a\u4e86\u80fd\u8fdb\u4e00\u6b65\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u5c06\u7b26\u54082NF\u8981\u6c42\u7684\u6570\u636e\u8868\u6539\u8fdb\u4e3a\u7b26\u54083NF\u7684\u8981\u6c42\u3002<\/p>\n<p><b>\u7b2c\u4e09\u8303\u5f0f\uff083NF\uff09<\/b> <b>3NF\u57282NF\u7684\u57fa\u7840\u4e4b\u4e0a\uff0c\u6d88\u9664\u4e86\u975e\u4e3b\u5c5e\u6027\u5bf9\u4e8e\u7801\u7684\u4f20\u9012\u51fd\u6570\u4f9d\u8d56<\/b>\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c \u5982\u679c\u5b58\u5728\u975e\u4e3b\u5c5e\u6027\u5bf9\u4e8e\u7801\u7684\u4f20\u9012\u51fd\u6570\u4f9d\u8d56\uff0c\u5219\u4e0d\u7b26\u54083NF\u7684\u8981\u6c42\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u770b\u770b\u88684\u4e2d\u7684\u8bbe\u8ba1\uff0c\u662f\u5426\u7b26\u54083NF\u7684\u8981\u6c42\u3002<\/p>\n<p>\u5bf9\u4e8e<b>\u9009\u8bfe<\/b>\u8868\uff0c\u4e3b\u7801\u4e3a\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff09\uff0c\u4e3b\u5c5e\u6027\u4e3a<b>\u5b66\u53f7<\/b>\u548c<b>\u8bfe\u540d\uff0c<\/b>\u975e\u4e3b\u5c5e\u6027\u53ea\u6709\u4e00\u4e2a\uff0c\u4e3a\u5206\u6570\uff0c\u4e0d\u53ef\u80fd\u5b58\u5728\u4f20\u9012\u51fd\u6570\u4f9d\u8d56\uff0c\u6240\u4ee5<b>\u9009\u8bfe<\/b>\u8868\u7684\u8bbe\u8ba1\uff0c\u7b26\u54083NF\u7684\u8981\u6c42\u3002<\/p>\n<p>\u5bf9\u4e8e<b>\u5b66\u751f<\/b>\u8868\uff0c\u4e3b\u7801\u4e3a<b>\u5b66\u53f7<\/b>\uff0c\u4e3b\u5c5e\u6027\u4e3a<b>\u5b66\u53f7<\/b>\uff0c\u975e\u4e3b\u5c5e\u6027\u4e3a<b>\u59d3\u540d<\/b>\u3001<b>\u7cfb\u540d<\/b>\u548c<b>\u7cfb\u4e3b\u4efb<\/b>\u3002\u56e0\u4e3a \u5b66\u53f7 \u2192 \u7cfb\u540d\uff0c\u540c\u65f6 \u7cfb\u540d \u2192 \u7cfb\u4e3b\u4efb\uff0c\u6240\u4ee5\u5b58\u5728\u975e\u4e3b\u5c5e\u6027<b>\u7cfb\u4e3b\u4efb<\/b>\u5bf9\u4e8e\u7801<b>\u5b66\u53f7<\/b>\u7684\u4f20\u9012\u51fd\u6570\u4f9d\u8d56\uff0c\u6240\u4ee5<b>\u5b66\u751f<\/b>\u8868\u7684\u8bbe\u8ba1\uff0c\u4e0d\u7b26\u54083NF\u7684\u8981\u6c42\u3002\u3002<\/p>\n<p>\u4e3a\u4e86\u8ba9\u6570\u636e\u8868\u8bbe\u8ba1\u8fbe\u52303NF\uff0c\u6211\u4eec\u5fc5\u987b\u8fdb\u4e00\u6b65\u8fdb\u884c\u6a21\u5f0f\u5206\u89e3\u4e3a\u4ee5\u4e0b\u5f62\u5f0f\uff1a<br \/>\n\u9009\u8bfe\uff08\u5b66\u53f7\uff0c\u8bfe\u540d\uff0c\u5206\u6570\uff09<br \/>\n\u5b66\u751f\uff08\u5b66\u53f7\uff0c\u59d3\u540d\uff0c\u7cfb\u540d\uff09<br \/>\n\u7cfb\uff08\u7cfb\u540d\uff0c\u7cfb\u4e3b\u4efb\uff09<\/p>\n<p>\u5bf9\u4e8e<b>\u9009\u8bfe<\/b>\u8868\uff0c\u7b26\u54083NF\u7684\u8981\u6c42\uff0c\u4e4b\u524d\u5df2\u7ecf\u5206\u6790\u8fc7\u4e86\u3002<\/p>\n<p>\u5bf9\u4e8e<b>\u5b66\u751f<\/b>\u8868\uff0c\u7801\u4e3a<b>\u5b66\u53f7<\/b>\uff0c\u4e3b\u5c5e\u6027\u4e3a<b>\u5b66\u53f7<\/b>\uff0c\u975e\u4e3b\u5c5e\u6027\u4e3a<b>\u7cfb\u540d<\/b>\uff0c\u4e0d\u53ef\u80fd\u5b58\u5728\u975e\u4e3b\u5c5e\u6027\u5bf9\u4e8e\u7801\u7684\u4f20\u9012\u51fd\u6570\u4f9d\u8d56\uff0c\u6240\u4ee5\u7b26\u54083NF\u7684\u8981\u6c42\u3002<\/p>\n<p>\u5bf9\u4e8e<b>\u7cfb<\/b>\u8868\uff0c\u7801\u4e3a<b>\u7cfb\u540d<\/b>\uff0c\u4e3b\u5c5e\u6027\u4e3a<b>\u7cfb\u540d<\/b>\uff0c\u975e\u4e3b\u5c5e\u6027\u4e3a<b>\u7cfb\u4e3b\u4efb<\/b>\uff0c\u4e0d\u53ef\u80fd\u5b58\u5728\u975e\u4e3b\u5c5e\u6027\u5bf9\u4e8e\u7801\u7684\u4f20\u9012\u51fd\u6570\u4f9d\u8d56\uff08\u81f3\u5c11\u8981\u6709\u4e09\u4e2a\u5c5e\u6027\u624d\u53ef\u80fd\u5b58\u5728\u4f20\u9012\u51fd\u6570\u4f9d\u8d56\u5173\u7cfb\uff09\uff0c\u6240\u4ee5\u7b26\u54083NF\u7684\u8981\u6c42\u3002\u3002<\/p>\n<p>\u65b0\u7684\u51fd\u6570\u4f9d\u8d56\u5173\u7cfb\u5982\u56fe6<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/50\/5b20707ff3d9afb51ef7bfda726c3e34_hd.jpg\" data-caption=\"\" data-rawwidth=\"783\" data-rawheight=\"388\" class=\"origin_image zh-lightbox-thumb\" width=\"783\" data-original=\"https:\/\/pic4.zhimg.com\/5b20707ff3d9afb51ef7bfda726c3e34_r.jpg\"\/><\/noscript><img decoding=\"async\" class=\"origin_image zh-lightbox-thumb lazy\" src=\"https:\/\/pic4.zhimg.com\/80\/5b20707ff3d9afb51ef7bfda726c3e34_hd.jpg\" width=\"783\" data-caption=\"\" data-rawwidth=\"783\" data-rawheight=\"388\" data-original=\"https:\/\/pic4.zhimg.com\/5b20707ff3d9afb51ef7bfda726c3e34_r.jpg\" data-actualsrc=\"https:\/\/pic4.zhimg.com\/50\/5b20707ff3d9afb51ef7bfda726c3e34_hd.jpg\" \/><\/figure>\n<p>\u56fe6<\/p>\n<p>\u65b0\u7684\u6570\u636e\u8868\u5982\u88685<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/50\/8bca802bcff92a8945bf808d18d7ec62_hd.jpg\" data-caption=\"\" data-rawwidth=\"470\" data-rawheight=\"419\" class=\"origin_image zh-lightbox-thumb\" width=\"470\" data-original=\"https:\/\/pic1.zhimg.com\/8bca802bcff92a8945bf808d18d7ec62_r.jpg\"\/><\/noscript><img decoding=\"async\" class=\"origin_image zh-lightbox-thumb lazy\" src=\"https:\/\/pic1.zhimg.com\/80\/8bca802bcff92a8945bf808d18d7ec62_hd.jpg\" width=\"470\" data-caption=\"\" data-rawwidth=\"470\" data-rawheight=\"419\" data-original=\"https:\/\/pic1.zhimg.com\/8bca802bcff92a8945bf808d18d7ec62_r.jpg\" data-actualsrc=\"https:\/\/pic1.zhimg.com\/50\/8bca802bcff92a8945bf808d18d7ec62_hd.jpg\" \/><\/figure>\n<p>\u88685<\/p>\n<p>\u73b0\u5728\u6211\u4eec\u6765\u770b\u4e00\u4e0b\uff0c\u8fdb\u884c\u540c\u6837\u7684\u64cd\u4f5c\uff0c\u662f\u5426\u8fd8\u5b58\u5728\u7740\u4e4b\u524d\u7684\u90a3\u4e9b\u95ee\u9898\uff1f<\/p>\n<ol>\n<li>\u5220\u9664\u67d0\u4e2a\u7cfb\u4e2d\u6240\u6709\u7684\u5b66\u751f\u8bb0\u5f55<br \/>\n\u8be5\u7cfb\u7684\u4fe1\u606f\u4e0d\u4f1a\u4e22\u5931\u3002\u2014\u2014\u6709\u6539\u8fdb<\/li>\n<li>\u63d2\u5165\u4e00\u4e2a\u5c1a\u65e0\u5b66\u751f\u7684\u65b0\u7cfb\u7684\u4fe1\u606f\u3002<br \/>\n\u56e0\u4e3a\u7cfb\u8868\u4e0e\u5b66\u751f\u8868\u76ee\u524d\u662f\u72ec\u7acb\u7684\u4e24\u5f20\u8868\uff0c\u6240\u4ee5\u4e0d\u5f71\u54cd\u3002\u2014\u2014\u6709\u6539\u8fdb<\/li>\n<li>\u6570\u636e\u5197\u4f59\u66f4\u52a0\u5c11\u4e86\u3002\u2014\u2014\u6709\u6539\u8fdb<\/li>\n<\/ol>\n<p><b>\u7ed3\u8bba<\/b><br \/>\n\u7531\u6b64\u53ef\u89c1\uff0c\u7b26\u54083NF\u8981\u6c42\u7684\u6570\u636e\u5e93\u8bbe\u8ba1\uff0c<b>\u57fa\u672c<\/b>\u4e0a\u89e3\u51b3\u4e86\u6570\u636e\u5197\u4f59\u8fc7\u5927\uff0c\u63d2\u5165\u5f02\u5e38\uff0c\u4fee\u6539\u5f02\u5e38\uff0c\u5220\u9664\u5f02\u5e38\u7684\u95ee\u9898\u3002\u5f53\u7136\uff0c\u5728\u5b9e\u9645\u4e2d\uff0c\u5f80\u5f80\u4e3a\u4e86\u6027\u80fd\u4e0a\u6216\u8005\u5e94\u5bf9\u6269\u5c55\u7684\u9700\u8981\uff0c\u7ecf\u5e38 \u505a\u52302NF\u6216\u80051NF\uff0c\u4f46\u662f\u4f5c\u4e3a\u6570\u636e\u5e93\u8bbe\u8ba1\u4eba\u5458\uff0c\u81f3\u5c11\u5e94\u8be5\u77e5\u9053\uff0c3NF\u7684\u8981\u6c42\u662f\u600e\u6837\u7684\u3002<\/p>\n<p>==============\u65f6\u9694\u534a\u5e74\uff0c\u7ec8\u4e8e\u51b3\u5b9a\u628a\u8fd9\u4e2a\u5751\u586b\u4e0a\uff0c\u6765\u665a\u4e86 ===========<\/p>\n<p><b>BCNF\u8303\u5f0f<\/b><\/p>\n<p>\u8981\u4e86\u89e3 BCNF \u8303\u5f0f\uff0c\u90a3\u4e48\u5148\u770b\u8fd9\u6837\u4e00\u4e2a\u95ee\u9898\uff1a<\/p>\n<p>\u82e5\uff1a<\/p>\n<ol>\n<li>\u67d0\u516c\u53f8\u6709\u82e5\u5e72\u4e2a\u4ed3\u5e93\uff1b<\/li>\n<li>\u6bcf\u4e2a\u4ed3\u5e93\u53ea\u80fd\u6709\u4e00\u540d\u7ba1\u7406\u5458\uff0c\u4e00\u540d\u7ba1\u7406\u5458\u53ea\u80fd\u5728\u4e00\u4e2a\u4ed3\u5e93\u4e2d\u5de5\u4f5c\uff1b<\/li>\n<li>\u4e00\u4e2a\u4ed3\u5e93\u4e2d\u53ef\u4ee5\u5b58\u653e\u591a\u79cd\u7269\u54c1\uff0c\u4e00\u79cd\u7269\u54c1\u4e5f\u53ef\u4ee5\u5b58\u653e\u5728\u4e0d\u540c\u7684\u4ed3\u5e93\u4e2d\u3002\u6bcf\u79cd\u7269\u54c1\u5728\u6bcf\u4e2a\u4ed3\u5e93\u4e2d\u90fd\u6709\u5bf9\u5e94\u7684\u6570\u91cf\u3002<\/li>\n<\/ol>\n<p>\u90a3\u4e48\u5173\u7cfb\u6a21\u5f0f \u4ed3\u5e93\uff08\u4ed3\u5e93\u540d\uff0c\u7ba1\u7406\u5458\uff0c\u7269\u54c1\u540d\uff0c\u6570\u91cf\uff09 \u5c5e\u4e8e\u54ea\u4e00\u7ea7\u8303\u5f0f\uff1f<\/p>\n<p>\u7b54\uff1a\u5df2\u77e5\u51fd\u6570\u4f9d\u8d56\u96c6\uff1a\u4ed3\u5e93\u540d \u2192 \u7ba1\u7406\u5458\uff0c\u7ba1\u7406\u5458 \u2192 \u4ed3\u5e93\u540d\uff0c\uff08\u4ed3\u5e93\u540d\uff0c\u7269\u54c1\u540d\uff09\u2192 \u6570\u91cf<br \/>\n\u7801\uff1a\uff08\u7ba1\u7406\u5458\uff0c\u7269\u54c1\u540d\uff09\uff0c\uff08\u4ed3\u5e93\u540d\uff0c\u7269\u54c1\u540d\uff09<br \/>\n\u4e3b\u5c5e\u6027\uff1a\u4ed3\u5e93\u540d\u3001\u7ba1\u7406\u5458\u3001\u7269\u54c1\u540d<br \/>\n\u975e\u4e3b\u5c5e\u6027\uff1a\u6570\u91cf<br \/>\n\u2235 \u4e0d\u5b58\u5728\u975e\u4e3b\u5c5e\u6027\u5bf9\u7801\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\u548c\u4f20\u9012\u51fd\u6570\u4f9d\u8d56\u3002\u2234 \u6b64\u5173\u7cfb\u6a21\u5f0f\u5c5e\u4e8e3NF\u3002<\/p>\n<p>\u57fa\u4e8e\u6b64\u5173\u7cfb\u6a21\u5f0f\u7684\u5173\u7cfb\uff08\u5177\u4f53\u7684\u6570\u636e\uff09\u53ef\u80fd\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<figure><noscript><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/50\/68d080d437732aad8cfe451b427849d6_hd.jpg\" data-caption=\"\" data-rawwidth=\"625\" data-rawheight=\"296\" class=\"origin_image zh-lightbox-thumb\" width=\"625\" data-original=\"https:\/\/pic4.zhimg.com\/68d080d437732aad8cfe451b427849d6_r.jpg\"\/><\/noscript><img decoding=\"async\" class=\"origin_image zh-lightbox-thumb lazy\" src=\"https:\/\/pic4.zhimg.com\/80\/68d080d437732aad8cfe451b427849d6_hd.jpg\" width=\"625\" data-caption=\"\" data-rawwidth=\"625\" data-rawheight=\"296\" data-original=\"https:\/\/pic4.zhimg.com\/68d080d437732aad8cfe451b427849d6_r.jpg\" data-actualsrc=\"https:\/\/pic4.zhimg.com\/50\/68d080d437732aad8cfe451b427849d6_hd.jpg\" \/><\/figure>\n<p>\u597d\uff0c\u65e2\u7136\u6b64\u5173\u7cfb\u6a21\u5f0f\u5df2\u7ecf\u5c5e\u4e8e\u4e86 3NF\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5173\u7cfb\u6a21\u5f0f\u662f\u5426\u5b58\u5728\u95ee\u9898\u5462\uff1f\u6211\u4eec\u6765\u770b\u4ee5\u4e0b\u51e0\u79cd\u64cd\u4f5c\uff1a<\/p>\n<ol>\n<li>\u5148\u65b0\u589e\u52a0\u4e00\u4e2a\u4ed3\u5e93\uff0c\u4f46\u5c1a\u672a\u5b58\u653e\u4efb\u4f55\u7269\u54c1\uff0c\u662f\u5426\u53ef\u4ee5\u4e3a\u8be5\u4ed3\u5e93\u6307\u6d3e\u7ba1\u7406\u5458\uff1f\u2014\u2014\u4e0d\u53ef\u4ee5\uff0c\u56e0\u4e3a\u7269\u54c1\u540d\u4e5f\u662f\u4e3b\u5c5e\u6027\uff0c\u6839\u636e\u5b9e\u4f53\u5b8c\u6574\u6027\u7684\u8981\u6c42\uff0c\u4e3b\u5c5e\u6027\u4e0d\u80fd\u4e3a\u7a7a\u3002<\/li>\n<li>\u67d0\u4ed3\u5e93\u88ab\u6e05\u7a7a\u540e\uff0c\u9700\u8981\u5220\u9664\u6240\u6709\u4e0e\u8fd9\u4e2a\u4ed3\u5e93\u76f8\u5173\u7684\u7269\u54c1\u5b58\u653e\u8bb0\u5f55\uff0c\u4f1a\u5e26\u6765\u4ec0\u4e48\u95ee\u9898\uff1f\u2014\u2014\u4ed3\u5e93\u672c\u8eab\u4e0e\u7ba1\u7406\u5458\u7684\u4fe1\u606f\u4e5f\u88ab\u968f\u4e4b\u5220\u9664\u4e86\u3002<\/li>\n<li>\u5982\u679c\u67d0\u4ed3\u5e93\u66f4\u6362\u4e86\u7ba1\u7406\u5458\uff0c\u4f1a\u5e26\u6765\u4ec0\u4e48\u95ee\u9898\uff1f\u2014\u2014\u8fd9\u4e2a\u4ed3\u5e93\u6709\u51e0\u6761\u7269\u54c1\u5b58\u653e\u8bb0\u5f55\uff0c\u5c31\u8981\u4fee\u6539\u591a\u5c11\u6b21\u7ba1\u7406\u5458\u4fe1\u606f\u3002<\/li>\n<\/ol>\n<p>\u4ece\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u5f97\u51fa\u7ed3\u8bba\uff0c\u5728\u67d0\u4e9b\u7279\u6b8a\u60c5\u51b5\u4e0b\uff0c\u5373\u4f7f\u5173\u7cfb\u6a21\u5f0f\u7b26\u5408 3NF \u7684\u8981\u6c42\uff0c\u4ecd\u7136\u5b58\u5728\u7740\u63d2\u5165\u5f02\u5e38\uff0c\u4fee\u6539\u5f02\u5e38\u4e0e\u5220\u9664\u5f02\u5e38\u7684\u95ee\u9898\uff0c\u4ecd\u7136\u4e0d\u662f \u201d\u597d\u201c \u7684\u8bbe\u8ba1\u3002<\/p>\n<p>\u9020\u6210\u6b64\u95ee\u9898\u7684\u539f\u56e0\uff1a\u5b58\u5728\u7740<b>\u4e3b\u5c5e\u6027<\/b>\u5bf9\u4e8e\u7801\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\u4e0e\u4f20\u9012\u51fd\u6570\u4f9d\u8d56\u3002\uff08\u5728\u6b64\u4f8b\u4e2d\u5c31\u662f\u5b58\u5728\u4e3b\u5c5e\u6027\u3010\u4ed3\u5e93\u540d\u3011\u5bf9\u4e8e\u7801\u3010\uff08\u7ba1\u7406\u5458\uff0c\u7269\u54c1\u540d\uff09\u3011\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\u3002<\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\u5c31\u662f\u8981\u5728 3NF \u7684\u57fa\u7840\u4e0a\u6d88\u9664<b>\u4e3b\u5c5e\u6027<\/b>\u5bf9\u4e8e\u7801\u7684\u90e8\u5206\u4e0e\u4f20\u9012\u51fd\u6570\u4f9d\u8d56\u3002<\/p>\n<p>\u4ed3\u5e93\uff08\u4ed3\u5e93\u540d\uff0c\u7ba1\u7406\u5458\uff09<br \/>\n\u5e93\u5b58\uff08\u4ed3\u5e93\u540d\uff0c\u7269\u54c1\u540d\uff0c\u6570\u91cf\uff09<\/p>\n<p>\u8fd9\u6837\uff0c\u4e4b\u524d\u7684\u63d2\u5165\u5f02\u5e38\uff0c\u4fee\u6539\u5f02\u5e38\u4e0e\u5220\u9664\u5f02\u5e38\u7684\u95ee\u9898\u5c31\u88ab\u89e3\u51b3\u4e86\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5173\u4e8e BCNF \u7684\u89e3\u91ca\u3002<\/p>\n<p>\u6700\u8fd1\u8eab\u4f53\u4e0d\u592a\u8212\u670d\uff0c\u5199\u4e0d\u52a8\u4e86\u3002\u6709\u7a7a\u518d\u653e\u51e0\u4e2a\u5178\u578b\u4e60\u9898\u53ca\u5176\u89e3\u7b54\u5427\u3002<br \/>\n===============================<br \/>\n\u95ee\u98981\uff1a<\/p>\n<p><a class=\"internal\" href=\"http:\/\/www.zhihu.com\/people\/li-de-zhu-84\" data-za-detail-view-id=\"1043\">\u674e\u5fb7\u7af9<\/a> \uff1a\u8001\u5e08\u60a8\u597d\uff0c\u6211\u770b\u4e86\u60a8\u5173\u4e8e\u6570\u636e\u5e93\u8303\u5f0f\u7684\u56de\u7b54\uff0c\u6709\u4e00\u70b9\u4e0d\u592a\u7406\u89e3\uff0c\u5c31\u662f\u5173\u4e8e\u7801\u7684\u5b9a\u4e49\uff0c\u5982\u679c\u9664K\u4e4b\u5916\u7684\u6240\u6709\u5c5e\u6027\u90fd\u5b8c\u5168\u51fd\u6570\u4f9d\u8d56\u4e8eK\u65f6\u624d\u80fd\u79f0K\u4e3a\u7801\uff0c\u90a3\u4e48\u5728\u5224\u65ad2NF\u65f6\u53c8\u600e\u4e48\u4f1a\u5b58\u5728\u975e\u4e3b\u5c5e\u6027\u5bf9\u7801\u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\u8fd9\u79cd\u60c5\u51b5\uff1f\u5e0c\u671b\u8001\u5e08\u6709\u65f6\u95f4\u80fd\u6307\u70b9\u4e00\u4e0b\uff0c\u8c22\u8c22<\/p>\n<p>\u6211 \uff1a\u5728\u201c\u7801\u201d\u7684\u5b9a\u4e49\u4e2d\uff0c\u9664 K \u4e4b\u5916\u7684\u6240\u6709\u5c5e\u6027\u5e94\u8be5\u770b\u6210\u662f\u4e00\u4e2a\u96c6\u5408 U\uff08\u4e5f\u5c31\u662f\u4e00\u4e2a\u6574\u4f53\uff09\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ea\u6709 K \u80fd\u591f\u5b8c\u5168\u51fd\u6570\u51b3\u5b9a U \u4e2d\u7684\u6bcf\u4e00\u4e2a\u5c5e\u6027\uff0c\u90a3\u4e48 K \u624d\u662f\u7801\u3002\u5982\u679c K \u53ea\u662f\u80fd\u591f\u5b8c\u5168\u51fd\u6570\u51b3\u5b9a U \u4e2d\u7684\u4e00\u90e8\u5206\u5c5e\u6027\uff0c\u800c\u4e0d\u80fd\u5b8c\u5168\u51fd\u6570\u51b3\u5b9a\u53e6\u5916\u4e00\u90e8\u5206\u5c5e\u6027\uff0c\u90a3\u4e48 K \u4e0d\u662f\u7801\u3002<\/p>\n<p>\u6bd4\u5982\u6709\u5173\u7cfb\u6a21\u5f0f R (Sno, Sname, Cno, Cname, Sdept, Sloc, Grade)\uff0c\u5176\u4e2d\u51fd\u6570\u4f9d\u8d56\u96c6\u4e3a F= {<br \/>\nSno \u2192 Sname, Sno \u2192 Sdept, Sdept \u2192 Sloc\uff0cSno \u2192 Sloc, Cno \u2192 Cname, (Sno, Cno) \u2192 Grade }<\/p>\n<p>\u90a3\u4e48 R \u4e2d\u7684\u7801\u53ea\u80fd\u662f (Sno, Cno)\uff0cSno \u6216 Cno \u5e76\u4e0d\u80fd\u5b8c\u5168\u51fd\u6570\u51b3\u5b9a\u9664 Sno \/ Cno \u4e4b\u5916\u7684\u6240\u6709\u5176\u4ed6\u5c5e\u6027\uff08\u5176\u5b9e\u5c31\u662f\u4e0d\u80fd\u51b3\u5b9a Grade )\uff0c\u6240\u4ee5\u5355\u72ec\u7684 Sno \u4e0e Cno \u5e76\u4e0d\u80fd\u4f5c\u4e3a\u7801\u3002<\/p>\n<p>\u6240\u4ee5\u53ef\u5f97\u5230\u4e3b\u5c5e\u6027\uff1aSno, Cno<br \/>\n\u975e\u4e3b\u5c5e\u6027\uff1aSname, Cname, Sdept, Sloc, Grade<\/p>\n<p>R \u4e2d\u5b58\u5728\u975e\u4e3b\u5c5e\u6027 Cname \u5bf9\u4e8e\u7801 (Sno, Cno) \u7684\u90e8\u5206\u51fd\u6570\u4f9d\u8d56 (Cno \u2192 Cname) \u3002\uff08\u8fd8\u6709\u5f88\u591a\u522b\u7684\u4f8b\u5b50\u5c31\u4e0d\u4e00\u4e00\u5217\u4e3e\u4e86\uff09\u3002\u6240\u4ee5 R \u4e0d\u7b26\u5408 2NF \u7684\u8981\u6c42\u3002<\/p>\n<p>========================================<\/p>\n<p>\u82b1\u4e86\u597d\u51e0\u5929\u65ad\u65ad\u7eed\u7eed\u5199\u4e86\u8fd9\u4e2a\u7b54\u6848\uff0c\u7d2f\u6b7b\u6211\u4e86\u3002\u770b\u6709\u4e0d\u5c11\u4eba\u5bf9\u6b64\u6709\u7591\u95ee\uff0c\u5e72\u8106\u5199\u4e00\u4e2a\u8be6\u7ec6\u70b9\u7684\uff0c\u5e0c\u671b\u6210\u4e3a\u8fd9\u4e2a\u77e5\u8bc6\u70b9\u7684\u6743\u5a01\u56de\u7b54\u2026\u2026\u5982\u679c\u6709\u4e00\u4e9b\u7ec6\u8282\u65b9\u9762\u7684\u95ee\u9898\uff0c\u6bd4\u5982\u8868\u8fbe\u4e0a\uff0c\u8fd8\u4f1a\u8fdb\u884c\u4fee\u6539\uff0c\u5927\u7684\u65b9\u9762\uff0c\u80af\u5b9a\u662f\u6ca1\u9519\u7684\u3002<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740 \u56fd\u5185\u7edd\u5927\u591a\u6570\u9662\u6821\u7528\u7684\u738b\u73ca\u7684\u300a\u6570<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[119],"class_list":["post-3692","post","type-post","status-publish","format-standard","hentry","tag-03-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/3692","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=3692"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/3692\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=3692"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=3692"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=3692"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}