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justify-between\">\u6982\u5ff5\u3001\u903b\u8f91\u548c\u7269\u7406\u662f\u6570\u636e\u5efa\u6a21\u7684\u4e09\u4e2a\u4e3b\u8981\u9636\u6bb5\uff0c\u6570\u636e\u5efa\u6a21\u662f\u8bbe\u8ba1\u6570\u636e\u5e93\u4ee5\u8868\u793a\u7ec4\u7ec7\u6216\u7cfb\u7edf\u5185\u6570\u636e\u53ca\u5176\u5173\u7cfb\u7684\u8fc7\u7a0b\u3002<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"absolute bottom-0 left-0 w-full border-t md:border-t-0 dark:border-white\/20 md:border-transparent md:dark:border-transparent md:bg-vert-light-gradient bg-white dark:bg-gray-800 md:!bg-transparent dark:md:bg-vert-dark-gradient pt-2\">\n<form class=\"stretch mx-2 flex flex-row gap-3 last:mb-2 md:mx-4 md:last:mb-6 lg:mx-auto lg:max-w-3xl\">\n<div class=\"relative flex h-full flex-1 md:flex-col\">\n<div class=\"flex ml-1 md:w-full md:m-auto md:mb-2 gap-0 md:gap-2 justify-center\">\n<p>\u4ee5\u4e0b\u662f\u6bcf\u4e2a\u9636\u6bb5\u6240\u5305\u542b\u5185\u5bb9\u7684\u6982\u8ff0\uff1a<\/p>\n<ol>\n<li><strong>\u6982\u5ff5\u6570\u636e\u6a21\u578b\uff1a<\/strong> \u6b64\u9636\u6bb5\u4e13\u6ce8\u4e8e\u7406\u89e3\u6570\u636e\u7684\u9ad8\u5c42\u6b21\u89c6\u56fe\u53ca\u5176\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u5b83\u72ec\u7acb\u4e8e\u4efb\u4f55\u7279\u5b9a\u6280\u672f\u6216\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08DBMS\uff09\u3002\u4e3b\u8981\u76ee\u6807\u662f\u8bc6\u522b\u4e3b\u8981\u5b9e\u4f53\u3001\u5b83\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb\u4ee5\u53ca\u5c5e\u6027\u3002\u6b64\u9636\u6bb5\u7684\u6210\u679c\u662f\u4e00\u4e2a\u6982\u5ff5\u6570\u636e\u6a21\u578b\uff0c\u7528\u4e8e\u6307\u5bfc\u903b\u8f91\u6570\u636e\u6a21\u578b\u7684\u5f00\u53d1\u3002<\/li>\n<li><strong>\u903b\u8f91\u6570\u636e\u6a21\u578b\uff1a<\/strong> \u6b64\u9636\u6bb5\u4e13\u6ce8\u4e8e\u8be6\u7ec6\u5b9a\u4e49\u6570\u636e\u7ed3\u6784\u548c\u5173\u7cfb\u3002\u5b83\u5305\u542b\u4e00\u4e2a\u903b\u8f91\u6a21\u5f0f\uff0c\u8be5\u6a21\u5f0f\u4f7f\u7528\u5b9e\u4f53-\u5173\u7cfb\u56fe\uff08ERD\uff09\u6216\u7c7b\u4f3c\u5de5\u5177\u5c06\u6982\u5ff5\u9636\u6bb5\u8bc6\u522b\u51fa\u7684\u6570\u636e\u6a21\u578b\u6982\u5ff5\u8fdb\u884c\u6620\u5c04\u3002\u903b\u8f91\u6570\u636e\u6a21\u578b\u4ee5\u6570\u636e\u7ed3\u6784\u548c\u5173\u7cfb\u7684\u5f62\u5f0f\u8868\u793a\u4e1a\u52a1\u9700\u6c42\uff0c\u4e14\u72ec\u7acb\u4e8e\u7269\u7406\u6570\u636e\u5e93\u8bbe\u8ba1\u3002\u6b64\u9636\u6bb5\u7684\u6210\u679c\u662f\u4e00\u4e2a\u903b\u8f91\u6570\u636e\u6a21\u578b\uff0c\u7528\u4e8e\u6307\u5bfc\u7269\u7406\u6570\u636e\u6a21\u578b\u7684\u5f00\u53d1\u3002<\/li>\n<li><strong>\u7269\u7406\u6570\u636e\u6a21\u578b\uff1a<\/strong> \u6b64\u9636\u6bb5\u4e13\u6ce8\u4e8e\u5c06\u903b\u8f91\u6570\u636e\u6a21\u578b\u8f6c\u6362\u4e3a\u7279\u5b9a\u7684\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u540c\u65f6\u8003\u8651\u76ee\u6807DBMS\u7684\u6027\u80fd\u3001\u5b58\u50a8\u9700\u6c42\u548c\u6280\u672f\u9650\u5236\u3002\u7269\u7406\u6570\u636e\u6a21\u578b\u63cf\u8ff0\u4e86\u6570\u636e\u5e93\u5bf9\u8c61\uff08\u5982\u8868\u3001\u5217\u548c\u7d22\u5f15\uff09\u53ca\u5176\u6570\u636e\u7c7b\u578b\u3001\u5927\u5c0f\u548c\u7ea6\u675f\u3002\u6b64\u9636\u6bb5\u7684\u6210\u679c\u662f\u4e00\u4e2a\u7269\u7406\u6570\u636e\u6a21\u578b\uff0c\u7528\u4e8e\u521b\u5efa\u548c\u5b9e\u73b0\u6570\u636e\u5e93\u3002<\/li>\n<\/ol>\n<p> \u603b\u4e4b\uff0c\u6982\u5ff5\u9636\u6bb5\u5728\u9ad8\u5c42\u6b21\u4e0a\u5b9a\u4e49\u6570\u636e\u5b9e\u4f53\u53ca\u5176\u5173\u7cfb\uff0c\u903b\u8f91\u9636\u6bb5\u5b9a\u4e49\u8be6\u7ec6\u7684\u6570\u636e\u7ed3\u6784\u548c\u5173\u7cfb\uff0c\u800c\u7269\u7406\u9636\u6bb5\u5c06\u903b\u8f91\u6570\u636e\u6a21\u578b\u6620\u5c04\u5230\u7279\u5b9a\u7684\u6570\u636e\u5e93\u6280\u672f\uff0c\u5305\u62ec\u6027\u80fd\u548c\u5b58\u50a8\u65b9\u9762\u7684\u8003\u8651\u3002<\/p>\n<\/div>\n<\/div>\n<\/form>\n<\/div>\n<h2>\u4ece\u95ee\u9898\u63cf\u8ff0\u521b\u5efa\u6982\u5ff5ER\u56fe<\/h2>\n<p>ER\u56fe\u5305\u542b\u56db\u4e2a\u5b9e\u4f53\uff1a\u6c7d\u8f66\u3001\u5ba2\u6237\u3001\u79df\u8d41\u548c\u7ef4\u62a4\u3002\u6bcf\u4e2a\u5b9e\u4f53\u90fd\u6709\u5176\u5c5e\u6027\uff0c\u4f8b\u5982\u6c7d\u8f66\u5b9e\u4f53\u7684 car_id\u3001\u578b\u53f7\u3001\u54c1\u724c\u3001\u5e74\u4efd\u3001\u65e5\u79df\u91d1\u3001\u71c3\u6cb9\u7c7b\u578b\u3001\u662f\u5426\u53ef\u7528\uff1b\u5ba2\u6237\u5b9e\u4f53\u7684 first_name\u3001last_name\u3001email\u3001\u7535\u8bdd\u53f7\u7801\u548c\u5730\u5740\uff1b\u79df\u8d41\u5b9e\u4f53\u7684 start_date\u3001end_date\u3001\u79df\u8d41\u8d39\u7387\u3001\u4fdd\u9669\u8d39\u3001\u71c3\u6cb9\u8d39\uff1b\u4ee5\u53ca\u7ef4\u62a4\u5b9e\u4f53\u7684 type\u3001description\u3001cost \u548c maintenance_date\u3002<\/p>\n<p>ER\u56fe\u8fd8\u5c55\u793a\u4e86\u5b9e\u4f53\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u5305\u62ec\u6c7d\u8f66\u4e0e\u79df\u8d41\u5b9e\u4f53\u4e4b\u95f4\u7684\u79df\u8d41\u5173\u7cfb\uff0c\u79df\u8d41\u4e0e\u5ba2\u6237\u5b9e\u4f53\u4e4b\u95f4\u7684\u5ba2\u6237\u79df\u8d41\u5173\u7cfb\uff0c\u4ee5\u53ca\u6c7d\u8f66\u4e0e\u7ef4\u62a4\u5b9e\u4f53\u4e4b\u95f4\u7684\u6c7d\u8f66\u7ef4\u62a4\u5173\u7cfb\u3002<\/p>\n<div class=\"group w-full text-gray-800 dark:text-gray-100 border-b border-black\/10 dark:border-gray-900\/50 bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0 m-auto\">\n<div class=\"relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]\">\n<p><img alt=\"Car rental conceptual ERD\" class=\"alignnone size-full wp-image-1279\" decoding=\"async\" height=\"546\" src=\"https:\/\/guides.visual-paradigm.com\/wp-content\/uploads\/2023\/03\/car-rental-conceptual-erd.png\" width=\"358\"\/><\/p>\n<h2 id=\"adCJKkW\">\u5c06\u6982\u5ff5ER\u56fe\u4f18\u5316\u4e3a\u903b\u8f91ER\u56fe<\/h2>\n<p>\u903b\u8f91ER\u56fe\u91c7\u7528\u66f4\u6b63\u5f0f\u3001\u66f4\u8be6\u7ec6\u7684\u8868\u793a\u6cd5\uff0c\u5f3a\u8c03\u8868\u3001\u5217\u3001\u952e\u548c\u5173\u7cfb\u3002\u5177\u4f53\u800c\u8a00\uff0c\u5217\u7684\u6570\u636e\u7c7b\u578b\u88ab\u660e\u786e\u5217\u51fa\u3002\u6b64\u5916\uff0c\u4e3a\u5173\u7cfb\u6dfb\u52a0\u4e86\u6807\u7b7e\uff08\u201c\u79df\u8d41\u201d\u3001\u201c\u88ab\u79df\u8d41\u201d\u548c\u201c\u9700\u8981\u201d\uff09\uff0c\u4ee5\u8868\u660e\u6bcf\u79cd\u5173\u7cfb\u7684\u6027\u8d28\u3002<\/p>\n<p><img alt=\"Car rental logical ERD\" class=\"alignnone size-full wp-image-1277\" decoding=\"async\" height=\"549\" src=\"https:\/\/guides.visual-paradigm.com\/wp-content\/uploads\/2023\/03\/car-rental-logical-erd.png\" width=\"496\"\/><\/p>\n<h2 id=\"adCJKkW\">\u5c06\u903b\u8f91ER\u56fe\u4f18\u5316\u4e3a\u7269\u7406ER\u56fe<\/h2>\n<p>\u7269\u7406ER\u56fe\u662f\u4e00\u79cd\u201c\u6570\u636e\u5e93\u6a21\u5f0f\u56fe\u201d\uff0c\u63d0\u4f9b\u4e86\u8db3\u591f\u8be6\u7ec6\u7684\u7ec6\u8282\uff0c\u4ee5\u4fbf\u5728\u7279\u5b9a\u7684DBMS\u4e2d\u5b9e\u73b0\u6570\u636e\u5e93\u3002\u5b9e\u4f53\u548c\u5217\u7684\u547d\u540d\u88ab\u4fee\u6539\u4e3a\uff1a<\/p>\n<ul>\n<li>\u652f\u6301DBMS\u7279\u5b9a\u7684\u8bed\u6cd5\u3002<\/li>\n<li>\u786e\u4fdd\u4f7f\u7528\u975e\u4fdd\u7559\u5b57\uff08\u4f8b\u5982\uff1aorder \u2192 purchase_order\uff0cdesc \u2192 description\uff09<\/li>\n<li>\u7b26\u5408\u7ec4\u7ec7\u7279\u5b9a\u7684\u547d\u540d\u89c4\u8303<\/li>\n<\/ul>\n<p>\u5c06\u7ef4\u62a4\u5b9e\u4f53\u4e2d\u7684\u5217\u2018desc\u2019\u91cd\u547d\u540d\u4e3a\u2018description\u2019\u3002<\/p>\n<p><img loading=\"lazy\" alt=\"Car rental physical ERD\" class=\"alignnone size-full wp-image-1278\" decoding=\"async\" height=\"553\" loading=\"lazy\" src=\"https:\/\/guides.visual-paradigm.com\/wp-content\/uploads\/2023\/03\/car-rental-physical-erd.png\" width=\"485\"\/><\/p>\n<h2>\u6570\u636e\u5e93\u6a21\u5f0f\u751f\u6210\uff1a\u5c06ER\u56fe\u8f6c\u6362\u4e3a\u7269\u7406\u6a21\u5f0f<\/h2>\n<p>\u6570\u636e\u5e93\u6a21\u5f0f\u662f\u6570\u636e\u5e93\u7ed3\u6784\u7684\u53ef\u89c6\u5316\u8868\u793a\uff0c\u5b9a\u4e49\u4e86\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e2d\u6570\u636e\u7684\u7ec4\u7ec7\u65b9\u5f0f\u3002\u8be5\u6a21\u5f0f\u57fa\u4e8e\u7528\u4e8e\u5efa\u6a21\u7cfb\u7edf\u4e2d\u4e0d\u540c\u5b9e\u4f53\u4e4b\u95f4\u5173\u7cfb\u7684\u5b9e\u4f53-\u5173\u7cfb\u56fe\uff08ERD\uff09\u521b\u5efa\u3002<\/p>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cERD\u9996\u5148\u88ab\u7ec6\u5316\u4e3a\u4e00\u4e2a\u903b\u8f91ERD\uff0c\u8be5ERD\u5b9a\u4e49\u4e86\u8f66\u8f86\u3001\u5ba2\u6237\u3001\u79df\u8d41\u548c\u7ef4\u62a4\u7b49\u5b9e\u4f53\u53ca\u5176\u5404\u81ea\u5c5e\u6027\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u903b\u8f91ERD\u6709\u52a9\u4e8e\u5efa\u7acb\u5b9e\u4f53\u4e4b\u95f4\u7684\u5173\u7cfb\u548c\u57fa\u6570\u3002<\/p>\n<p>\u5728\u7ec6\u5316\u903b\u8f91ERD\u4e4b\u540e\uff0c\u4e0b\u4e00\u6b65\u662f\u751f\u6210\u4e00\u4e2a\u7269\u7406ERD\uff0c\u8be5ERD\u5b9a\u4e49\u4e86\u5305\u542b\u6240\u6709\u5fc5\u8981\u6570\u636e\u7c7b\u578b\u3001\u4e3b\u952e\u548c\u5916\u952e\u4ee5\u53ca\u4efb\u4f55\u7ea6\u675f\u7684\u5b9e\u9645\u6570\u636e\u5e93\u6a21\u5f0f\u3002\u7269\u7406ERD\u53cd\u6620\u4e86\u903b\u8f91ERD\uff0c\u4f46\u5bf9\u6570\u636e\u5728\u6570\u636e\u5e93\u4e2d\u7684\u5b58\u50a8\u65b9\u5f0f\u63d0\u4f9b\u4e86\u66f4\u8be6\u7ec6\u7684\u8bf4\u660e\u3002<\/p>\n<p>\u57fa\u4e8e\u7269\u7406ERD\uff0c\u7f16\u5199\u4e86SQL\u4ee3\u7801\u4ee5\u521b\u5efa\u5177\u6709\u9002\u5f53\u8868\u3001\u5217\u53ca\u5176\u4e4b\u95f4\u5173\u7cfb\u7684\u6570\u636e\u5e93\u6a21\u5f0f\u3002\u6a21\u5f0f\u4e2d\u7684\u6bcf\u4e2a\u8868\u4ee3\u8868\u7cfb\u7edf\u4e2d\u7684\u4e00\u4e2a\u5b9e\u4f53\uff0c\u5217\u4ee3\u8868\u8be5\u5b9e\u4f53\u7684\u5c5e\u6027\u3002\u4e3b\u952e\u88ab\u5b9a\u4e49\u4e3a\u552f\u4e00\u6807\u8bc6\u8868\u4e2d\u7684\u6bcf\u6761\u8bb0\u5f55\uff0c\u5916\u952e\u7528\u4e8e\u5efa\u7acb\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n<blockquote>\n<p>CREATE TABLE Car (<br \/>\ncar_id INT PRIMARY KEY,<br \/>\nmodel VARCHAR(255),<br \/>\nmake VARCHAR(255),<br \/>\nyear INT,<br \/>\ndaily_rate DECIMAL(10, 2),<br \/>\nfuel_type VARCHAR(255),<br \/>\nis_available BOOLEAN<br \/>\n);<\/p>\n<p>CREATE TABLE Customer (<br \/>\ncustomer_id INT PRIMARY KEY,<br \/>\nfirst_name VARCHAR(255),<br \/>\nlast_name VARCHAR(255),<br \/>\nemail VARCHAR(255),<br \/>\nphone_number VARCHAR(255),<br \/>\naddress VARCHAR(255)<br \/>\n);<\/p>\n<p>CREATE TABLE Rental (<br \/>\nrental_id INT PRIMARY KEY,<br \/>\nstart_date DATE,<br \/>\nend_date DATE,<br \/>\nrental_rate DECIMAL(10, 2),<br \/>\ninsurance_charge DECIMAL(10, 2),<br \/>\nfuel_charge DECIMAL(10, 2),<br \/>\ncar_id INT,<br \/>\ncustomer_id INT,<br \/>\nFOREIGN KEY (car_id) REFERENCES Car(car_id),<br \/>\n\u5916\u952e (customer_id) \u53c2\u7167 Customer(customer_id)<br \/>\n);<\/p>\n<p>\u521b\u5efa\u8868 Maintenance (<br \/>\nmaintenance_id \u6574\u6570 \u4e3b\u952e,<br \/>\ntype \u5b57\u7b26\u4e32(255),<br \/>\ndescription \u6587\u672c,<br \/>\ncost \u5341\u8fdb\u5236(10, 2),<br \/>\nmaintenance_date \u65e5\u671f,<br \/>\ncar_id \u6574\u6570,<br \/>\n\u5916\u952e (car_id) \u53c2\u7167 Car(car_id)<br \/>\n);<\/p>\n<\/blockquote>\n<h2>\u6458\u8981<\/h2>\n<\/div>\n<p>\u672c\u6587\u8ba8\u8bba\u4e86\u901a\u8fc7\u4f18\u5316\u5b9e\u4f53-\u5173\u7cfb\u56fe\uff08ERD\uff09\u6765\u751f\u6210\u6709\u6548\u6570\u636e\u5e93\u6a21\u5f0f\u7684\u8fc7\u7a0b\u3002ERD \u4ece\u6982\u5ff5\u5c42\u9762\u9010\u6b65\u4f18\u5316\u5230\u903b\u8f91\u5c42\u9762\uff0c\u518d\u8fdb\u4e00\u6b65\u4f18\u5316\u5230\u7269\u7406\u5c42\u9762\u3002\u903b\u8f91 ERD \u786e\u5b9a\u4e86\u5b9e\u4f53\u4e4b\u95f4\u7684\u5173\u7cfb\u548c\u57fa\u6570\uff0c\u800c\u7269\u7406 ERD \u5219\u5b9a\u4e49\u4e86\u5b9e\u9645\u7684\u6570\u636e\u5e93\u6a21\u5f0f\uff0c\u5305\u62ec\u6240\u6709\u5fc5\u8981\u7684\u6570\u636e\u7c7b\u578b\u3001\u4e3b\u952e\u548c\u5916\u952e\u4ee5\u53ca\u7ea6\u675f\u6761\u4ef6\u3002<\/p>\n<p>\u968f\u540e\uff0c\u6839\u636e\u7269\u7406 ERD \u7f16\u5199 SQL \u4ee3\u7801\uff0c\u4ee5\u521b\u5efa\u5305\u542b\u9002\u5f53\u8868\u3001\u5217\u548c\u5173\u7cfb\u7684\u6570\u636e\u5e93\u6a21\u5f0f\u3002\u672c\u6587\u5f3a\u8c03\u4e86\u4f18\u5316 ERD \u5bf9\u6709\u6548\u6570\u636e\u5e93\u8bbe\u8ba1\u7684\u91cd\u8981\u6027\uff0c\u5e76\u63d0\u4f9b\u4e86\u4ece ERD \u751f\u6210\u6570\u636e\u5e93\u6a21\u5f0f\u8fc7\u7a0b\u7684\u6df1\u5165\u89c1\u89e3\u3002<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u4f18\u5316\u5b9e\u4f53-\u5173\u7cfb\u56fe\uff08ERD\uff09\u4ee5\u5b9e\u73b0\u6709\u6548\u7684\u6570\u636e\u5e93\u8bbe\u8ba1 \u95ee\u9898\u63cf\u8ff0\uff1aER\u5efa\u6a21\u2014\u2014\u4e00\u5bb6\u6c7d\u8f66\u79df\u8d41\u516c\u53f8\u7cfb\u7edf 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class=\"screen-reader-text\">\u638c\u63e1ER\u5efa\u6a21\uff1a\u7ed3\u5408\u5b9e\u9645\u6848\u4f8b\u7684\u9010\u6b65\u6307\u5357\uff08\u7b2c2\u90e8\u5206\uff0c\u51715\u90e8\u5206\uff09<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":6809,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_eb_attr":"","neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[17],"tags":[],"class_list":["post-6808","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-data-modeling-database"],"yoast_head":"<!-- This site is optimized with the Yoast 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