{"id":3696,"date":"2019-07-22T15:13:16","date_gmt":"2019-07-22T07:13:16","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=3696"},"modified":"2019-07-22T15:13:16","modified_gmt":"2019-07-22T07:13:16","slug":"%e6%95%b0%e6%8d%ae%e5%ba%93%e8%ae%be%e8%ae%a1%e4%b8%89%e8%8c%83%e5%bc%8f%e5%92%8c%e5%8f%8d%e8%8c%83%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/3696","title":{"rendered":"\u6570\u636e\u5e93\u8bbe\u8ba1\u4e09\u8303\u5f0f\u548c\u53cd\u8303\u5f0f"},"content":{"rendered":"<div class=\"meta\"><a href=\"https:\/\/www.jianshu.com\/p\/bd1f6a712d41\">\u539f\u6587\u5730\u5740<\/a><\/div>\n<div><\/div>\n<div class=\"show-content\" data-note-content=\"\">\n<div class=\"show-content-free\">\n<p><strong>\u8303\u5f0f\u7684\u7ea7\u522b<\/strong><br \/>\n\u8bbe\u8ba1\u5173\u7cfb\u6570\u636e\u5e93\u65f6\uff0c\u9075\u4ece\u4e0d\u540c\u7684\u89c4\u8303\u8981\u6c42\uff0c\u8bbe\u8ba1\u51fa\u5408\u7406\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff0c\u8fd9\u4e9b\u4e0d\u540c\u7684\u89c4\u8303\u8981\u6c42\u88ab\u79f0\u4e3a\u4e0d\u540c\u7684\u8303\u5f0f\uff0c\u5404\u79cd\u8303\u5f0f\u5448\u9012\u6b21\u89c4\u8303\uff0c\u8d8a\u9ad8\u7684\u8303\u5f0f\u6570\u636e\u5e93\u5197\u4f59\u8d8a\u5c0f\u3002<br \/>\n\u76ee\u524d\u5173\u7cfb\u6570\u636e\u5e93\u6709\u516d\u79cd\u8303\u5f0f\uff1a<strong><em>\u7b2c\u4e00\u8303\u5f0f\uff081NF\uff09\u3001\u7b2c\u4e8c\u8303\u5f0f\uff082NF\uff09\u3001\u7b2c\u4e09\u8303\u5f0f\uff083NF\uff09\u3001\u5df4\u65af-\u79d1\u5fb7\u8303\u5f0f\uff08BCNF\uff09\u3001\u7b2c\u56db\u8303\u5f0f(4NF\uff09\u548c\u7b2c\u4e94\u8303\u5f0f\uff085NF\uff0c\u53c8\u79f0\u5b8c\u7f8e\u8303\u5f0f\uff09\u3002<\/em><\/strong><br 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data-original-width=\"1092\" data-original-height=\"429\" data-original-format=\"image\/jpeg\" data-original-filesize=\"36439\" \/><\/div>\n<\/div>\n<div class=\"image-caption\">\u7b2c\u4e00\u8303\u5f0f<\/div>\n<\/div>\n<p>\u4f46\u662f\u5177\u4f53\u5730\u5740\u5230\u5e95\u8981\u4e0d\u8981\u62c6\u5206 \u8fd8\u8981\u770b\u5177\u4f53\u60c5\u5f62\uff0c\u6bd4\u5982\u770b\u770b\u5c06\u6765\u4f1a\u4e0d\u4f1a\u6309\u56fd\u5bb6\u6216\u8005\u7701\u5e02\u8fdb\u884c\u5206\u7c7b\u6c47\u603b\u6216\u8005\u6392\u5e8f\uff0c\u5982\u679c\u9700\u8981\uff0c\u6700\u597d\u5c31\u62c6\uff0c\u5982\u679c\u4e0d\u9700\u8981\u800c\u4ec5\u4ec5\u8d77\u5b57\u7b26\u4e32\u7684\u4f5c\u7528\uff0c\u53ef\u4ee5\u4e0d\u62c6\uff0c\u64cd\u4f5c\u8d77\u6765\u66f4\u65b9\u4fbf\u3002<\/p>\n<p><strong>\u7b2c\u4e8c\u8303\u5f0f:\u975e\u952e\u5b57\u6bb5\u5fc5\u987b\u4f9d\u8d56\u4e8e\u952e\u5b57\u6bb5<\/strong><br 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class=\"image-caption\">\u7b2c\u4e8c\u8303\u5f0f<\/div>\n<\/div>\n<p><strong>\u7b2c\u4e09\u8303\u5f0f\uff1a\u57281NF\u57fa\u7840\u4e0a\uff0c\u9664\u4e86\u4e3b\u952e\u4ee5\u5916\u7684\u5176\u5b83\u5217\u90fd\u4e0d\u4f20\u9012\u4f9d\u8d56\u4e8e\u4e3b\u952e\u5217\uff0c\u6216\u8005\u8bf4\uff1a \u4efb\u4f55\u975e\u4e3b\u5c5e\u6027\u4e0d\u4f9d\u8d56\u4e8e\u5176\u5b83\u975e\u4e3b\u5c5e\u6027<\/strong>\uff08\u57282NF\u57fa\u7840\u4e0a\u6d88\u9664\u4f20\u9012\u4f9d\u8d56\uff09<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"1093\" data-height=\"604\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/10175660-5b56907b6a719772.JPG?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/1000\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/10175660-5b56907b6a719772.JPG\" data-original-width=\"1093\" data-original-height=\"604\" data-original-format=\"image\/jpeg\" data-original-filesize=\"63366\" \/><\/div>\n<\/div>\n<div class=\"image-caption\">\u7b2c\u4e09\u8303\u5f0f<\/div>\n<\/div>\n<p>\u4e0a\u9762\u7684\u8868\uff0c\u5b66\u53f7\u548c\u59d3\u540d\u5b58\u5728\u4f20\u9012\u4f9d\u8d56\uff0c\u56e0\u4e3a(\u5b66\u53f7\uff0c\u59d3\u540d)-&gt;\u6210\u7ee9\uff0c\u5b66\u53f7-&gt;\u6210\u7ee9\uff0c\u59d3\u540d-&gt;\u6210\u7ee9\u3002\u6240\u4ee5\u5b66\u53f7\u548c\u59d3\u540d\u6709\u4e00\u4e2a\u5197\u4f59\u4e86\uff0c\u53ea\u9700\u8981\u4fdd\u7559\u4e00\u4e2a\u3002<\/p>\n<p><strong>\u8303\u5f0f\u7684\u4f18\u70b9\uff1a<\/strong><\/p>\n<pre class=\"hljs undefined\"><code>    1\uff09\u8303\u5f0f\u5316\u7684\u6570\u636e\u5e93\u66f4\u65b0\u8d77\u6765\u66f4\u52a0\u5feb\uff1b\r\n\r\n    2\uff09\u8303\u5f0f\u5316\u4e4b\u540e\uff0c\u53ea\u6709\u5f88\u5c11\u7684\u91cd\u590d\u6570\u636e\uff0c\u53ea\u9700\u8981\u4fee\u6539\u66f4\u5c11\u7684\u6570\u636e\uff1b\r\n\r\n    3\uff09\u8303\u5f0f\u5316\u7684\u8868\u66f4\u5c0f\uff0c\u53ef\u4ee5\u5728\u5185\u5b58\u4e2d\u6267\u884c\uff1b\r\n\r\n    4\uff09\u5f88\u5c11\u7684\u5197\u4f59\u6570\u636e\uff0c\u5728\u67e5\u8be2\u7684\u65f6\u5019\u9700\u8981\u66f4\u5c11\u7684distinct\u6216\u8005group by\u8bed\u53e5\u3002\r\n<\/code><\/pre>\n<p><strong>\u8303\u5f0f\u7684\u7f3a\u70b9\uff1a<\/strong><\/p>\n<pre class=\"hljs undefined\"><code>    \u8303\u5f0f\u5316\u7684\u8868\uff0c\u5728\u67e5\u8be2\u7684\u65f6\u5019\u7ecf\u5e38\u9700\u8981\u5f88\u591ajoin\u5173\u8054,\u589e\u52a0\u8ba9\u67e5\u8be2\u7684\u4ee3\u4ef7\r\n<\/code><\/pre>\n<p><strong>\u53cd\u8303\u5f0f\u7684\u4f18\u70b9\uff1a<\/strong><\/p>\n<pre class=\"hljs undefined\"><code>    1\uff09\u53ef\u4ee5\u907f\u514d\u5173\u8054\uff0c\u56e0\u4e3a\u6240\u6709\u7684\u6570\u636e\u51e0\u4e4e\u90fd\u53ef\u4ee5\u5728\u4e00\u5f20\u8868\u4e0a\u663e\u793a\uff1b\r\n\r\n    2\uff09\u53ef\u4ee5\u8bbe\u8ba1\u6709\u6548\u7684\u7d22\u5f15\uff1b\r\n<\/code><\/pre>\n<p><strong>\u53cd\u8303\u5f0f\u7684\u7f3a\u70b9\uff1a<\/strong><\/p>\n<pre class=\"hljs undefined\"><code>\u8868\u683c\u5185\u7684\u5197\u4f59\u8f83\u591a\uff0c\u5220\u9664\u6570\u636e\u65f6\u5019\u4f1a\u9020\u6210\u8868\u6709\u4e9b\u6709\u7528\u7684\u4fe1\u606f\u4e22\u5931\u3002\r\n<\/code><\/pre>\n<p>\u6240\u4ee5\u5728\u8bbe\u8ba1\u6570\u636e\u5e93\u65f6\uff0c\u8981\u6ce8\u610f\u6df7\u7528\u8303\u5f0f\u5316\u548c\u53cd\u8303\u5f0f\u5316\u3002<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740 \u8303\u5f0f\u7684\u7ea7\u522b 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