{"id":9989,"date":"2023-03-02T17:47:01","date_gmt":"2023-03-02T09:47:01","guid":{"rendered":"https:\/\/www.cybermedian.com\/ja\/10698-2\/"},"modified":"2026-04-20T09:11:35","modified_gmt":"2026-04-20T09:11:35","slug":"10698-2","status":"publish","type":"post","link":"https:\/\/www.cybermedian.com\/ja\/10698-2\/","title":{"rendered":"\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\u306e\u5b66\u7fd2\uff1a\u5305\u62ec\u7684\u306a\u30ac\u30a4\u30c9"},"content":{"rendered":"<h2>ER\u56f3\u306e\u7d39\u4ecb<\/h2>\n<p><img alt=\"What is Entity Relationship Diagram (ERD)?\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/02-er-diagram-depicts-business-entities-relationships.png\"\/><\/p>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\uff08ER\uff09\u56f3\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u30c7\u30fc\u30bf\u8981\u4ef6\u3068\u7570\u306a\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u8996\u899a\u7684\u306b\u8868\u73fe\u3059\u308b\u5f37\u529b\u306a\u65b9\u6cd5\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u7279\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u306b\u304a\u3044\u3066\u3001\u3055\u307e\u3056\u307e\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u52b9\u7387\u7684\u3067\u52b9\u679c\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3092\u69cb\u7bc9\u3059\u308b\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002ER\u56f3\u306f\u3001\u7570\u306a\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3001\u305d\u306e\u5c5e\u6027\u3001\u304a\u3088\u3073\u305d\u308c\u3089\u306e\u9593\u306e\u95a2\u4fc2\u3092\u7279\u5b9a\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u5305\u62ec\u7684\u306a\u6982\u8981\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n<p>ER\u56f3\u306f\u3001\u958b\u767a\u8005\u3001\u30c7\u30b6\u30a4\u30ca\u30fc\u3001\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u306e\u3059\u3079\u3066\u306b\u3068\u3063\u3066\u8cb4\u91cd\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u958b\u767a\u8005\u3084\u30c7\u30b6\u30a4\u30ca\u30fc\u306f\u3001ER\u56f3\u3092\u7528\u3044\u3066\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u8981\u4ef6\u3092\u7406\u89e3\u3057\u3001\u52b9\u7387\u7684\u3067\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u5bb9\u6613\u306a\u6700\u9069\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002\u4e00\u65b9\u3001\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u306fER\u56f3\u3092\u7528\u3044\u3066\u30b7\u30b9\u30c6\u30e0\u306e\u30c7\u30fc\u30bf\u8981\u4ef6\u3092\u8996\u899a\u5316\u3057\u3001\u8a2d\u8a08\u306e\u6539\u5584\u70b9\u306b\u3064\u3044\u3066\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u63d0\u4f9b\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u5168\u4f53\u7684\u306b\u898b\u3066\u3001ER\u56f3\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u306e\u91cd\u8981\u306a\u69cb\u6210\u8981\u7d20\u3067\u3042\u308a\u3001\u3055\u307e\u3056\u307e\u306a\u696d\u754c\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002ER\u56f3\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u958b\u767a\u8005\u3001\u30c7\u30b6\u30a4\u30ca\u30fc\u3001\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u306f\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u304c\u30b7\u30b9\u30c6\u30e0\u306e\u8981\u4ef6\u3092\u6e80\u305f\u3059\u3088\u3046\u306b\u8a2d\u8a08\u3055\u308c\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3067\u304d\u3001\u52b9\u7387\u7684\u3067\u52b9\u679c\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u69cb\u7bc9\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>ER\u56f3\u306e\u69cb\u6210\u8981\u7d20<\/h2>\n<div class=\"flex-1 overflow-hidden\">\n<div class=\"react-scroll-to-bottom--css-ypbly-79elbk h-full dark:bg-gray-800\">\n<div class=\"react-scroll-to-bottom--css-ypbly-1n7m0yu\">\n<div class=\"flex flex-col items-center text-sm dark:bg-gray-800\">\n<div class=\"w-full border-b border-black\/10 dark:border-gray-900\/50 text-gray-800 dark:text-gray-100 group bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 m-auto md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0\">\n<div class=\"relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\">\n<div class=\"markdown prose w-full break-words dark:prose-invert dark\">\n<p>ER\u56f3\u306f\u3001\u4e3b\u306b3\u3064\u306e\u69cb\u6210\u8981\u7d20\u3067\u69cb\u6210\u3055\u308c\u3066\u3044\u307e\u3059\uff1a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3001\u5c5e\u6027\u3001\u95a2\u4fc2\u3002\u3053\u308c\u3089\u306e\u69cb\u6210\u8981\u7d20\u306f\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u304a\u3088\u3073\u7570\u306a\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u8996\u899a\u7684\u306b\u8868\u73fe\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"w-full border-b border-black\/10 dark:border-gray-900\/50 text-gray-800 dark:text-gray-100 group bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 m-auto md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0\">\n<div class=\"relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\">\n<div class=\"markdown prose w-full break-words dark:prose-invert dark\">\n<ul>\n<li><strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a<\/strong>\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306b\u8868\u73fe\u3055\u308c\u308b\u73fe\u5b9f\u4e16\u754c\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3001\u9867\u5ba2\u3084\u6ce8\u6587\u306a\u3069\u3001\u56fa\u6709\u306e\u8b58\u5225\u3092\u6301\u3064\u3082\u306e\u3002<\/li>\n<\/ul>\n<p><img alt=\"Entity Attributes\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/04-an-erd-entity-with-entities.png\"\/><\/p>\n<ul>\n<li><strong>\u5c5e\u6027\uff1a<\/strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u7279\u5fb4\u3067\u3001\u540d\u524d\u3001\u4f4f\u6240\u3001ID\u306a\u3069\u3067\u3042\u308a\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u95a2\u3059\u308b\u8ffd\u52a0\u60c5\u5831\u3092\u63d0\u4f9b\u3057\u3001\u4ed6\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u533a\u5225\u3059\u308b\u5f79\u5272\u3092\u679c\u305f\u3059\u3002<\/li>\n<li><strong>\u95a2\u4fc2\uff1a<\/strong>2\u3064\u4ee5\u4e0a\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u63a5\u7d9a\u3067\u3001\u305d\u308c\u3089\u304c\u3069\u306e\u3088\u3046\u306b\u76f8\u4e92\u306b\u95a2\u4fc2\u3057\u3066\u3044\u308b\u304b\u3092\u8aac\u660e\u3059\u308b\u3002<\/li>\n<li><strong>1\u5bfe1\u306e\u95a2\u4fc2\uff1a<\/strong>1\u3064\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u5225\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30681\u5bfe1\u306e\u95a2\u4fc2\u3067\u95a2\u9023\u4ed8\u3051\u3089\u308c\u308b\u95a2\u4fc2\u3067\u3042\u308a\u3001\u5404\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u4ed6\u306e1\u3064\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u3057\u304b\u95a2\u9023\u4ed8\u3051\u3089\u308c\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3059\u308b\u3002<\/li>\n<\/ul>\n<p><img alt=\"One-to-One cardinality example\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/07-erd-one-to-one-relationship-example.png\"\/> <img alt=\"One-to-Many cardinality example\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/08-erd-one-to-many-example.png\"\/><\/p>\n<ul>\n<li><strong>1\u5bfe\u591a\u306e\u95a2\u4fc2\uff1a<\/strong>1\u3064\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u8907\u6570\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u308b\u95a2\u4fc2\u3067\u3042\u308a\u3001\u5404\u95a2\u9023\u3059\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f1\u3064\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u3057\u304b\u95a2\u9023\u4ed8\u3051\u3089\u308c\u306a\u3044\u3002<\/li>\n<li><strong>\u591a\u5bfe\u591a\u306e\u95a2\u4fc2\uff1a<\/strong>\u8907\u6570\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u8907\u6570\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u308b\u95a2\u4fc2\u3067\u3042\u308a\u3001\u5404\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u4ed6\u306e\u8907\u6570\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n<p><img alt=\"Many-to-Many cardinality example\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/09-erd-many-to-many-example.png\"\/><\/p>\n<ul>\n<li><strong>\u57fa\u6570\uff1a<\/strong>\u95a2\u4fc2\u306b\u304a\u3044\u3066\u3001\u5225\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u6570\u3002<\/li>\n<li><strong>\u53c2\u52a0\u5ea6\uff1a<\/strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u95a2\u4fc2\u306b\u304a\u3044\u3066\u53c2\u52a0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u30ec\u30d9\u30eb\u3067\u3001\u30aa\u30d7\u30b7\u30e7\u30f3\u307e\u305f\u306f\u5fc5\u9808\u306e\u3044\u305a\u308c\u304b\u3002<\/li>\n<li><strong>\u4e3b\u30ad\u30fc\uff1a<\/strong>\u4e3b\u30ad\u30fc\uff08PK\uff09\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u306b\u304a\u3051\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ERD\uff09\u306e\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u5404\u30ec\u30b3\u30fc\u30c9\u3092\u4e00\u610f\u306b\u8b58\u5225\u3059\u308b\u5c5e\u6027\u3067\u3059\u3002\u4e3b\u30ad\u30fc\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u5185\u306b\u91cd\u8907\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3057\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u8a00\u3044\u63db\u3048\u308c\u3070\u3001\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u5404\u30ec\u30b3\u30fc\u30c9\u304c\u4e00\u610f\u3067\u3042\u308a\u3001\u66d6\u6627\u3055\u306a\u304f\u8b58\u5225\u3055\u308c\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u306eERD\u306e\u4f8b\u306f\u3001\u4e3b\u30ad\u30fc\u5c5e\u6027\u3068\u3057\u3066\u300eID\u300f\u3092\u6301\u3064\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u300eProduct\u300f\u3068\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306e\u30c6\u30fc\u30d6\u30eb\u30ec\u30b3\u30fc\u30c9\u306e\u30d7\u30ec\u30d3\u30e5\u30fc\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u30023\u756a\u76ee\u306e\u30ec\u30b3\u30fc\u30c9\u306f\u7121\u52b9\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001ID\u300ePDT-0002\u300f\u306e\u5024\u304c\u4ed6\u306e\u30ec\u30b3\u30fc\u30c9\u3067\u65e2\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p><img alt=\"Primary Key\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/05-concept-of-erd-primary-key.png\"\/><\/p>\n<div class=\"space-gap-large\"><\/div>\n<p><strong>\u5916\u90e8\u30ad\u30fc\uff1a<\/strong>\u5916\u90e8\u30ad\u30fc\uff08FK\uff09\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u78ba\u7acb\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u4e3b\u30ad\u30fc\u3092\u6307\u3057\u30012\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u63a5\u7d9a\u3092\u69cb\u7bc9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u4e3b\u30ad\u30fc\u3068\u306f\u7570\u306a\u308a\u3001\u5916\u90e8\u30ad\u30fc\u306f\u91cd\u8907\u3057\u305f\u5024\u3092\u542b\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u30011\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u3001\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u540c\u3058\u30ec\u30b3\u30fc\u30c9\u3092\u53c2\u7167\u3067\u304d\u308b\u305f\u3081\u3067\u3059\u3002\u5916\u90e8\u30ad\u30fc\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u95a2\u9023\u3059\u308b\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u53c2\u7167\u6574\u5408\u6027\u3092\u4fdd\u8a3c\u3057\u3001\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3068\u4e00\u8cab\u6027\u3092\u78ba\u4fdd\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n<div><\/div>\n<div class=\"markdown prose w-full break-words dark:prose-invert dark\">\u4ee5\u4e0b\u306eER\u56f3\u306e\u4f8b\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u5217\u3092\u6301\u3064\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u793a\u3057\u3066\u304a\u308a\u3001\u305d\u306e\u3046\u3061\u306e1\u3064\u304c\u5225\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u53c2\u7167\u3059\u308b\u305f\u3081\u306b\u5916\u90e8\u30ad\u30fc\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/div>\n<div><\/div>\n<div class=\"markdown prose w-full break-words dark:prose-invert dark\"><img alt=\"Foreign Key\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/06-concept-of-erd-foreign-key.png\"\/><\/div>\n<\/div>\n<\/div>\n<div class=\"flex justify-between\">\n<div class=\"text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-3 md:gap-4 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible\">ER\u56f3\u306e\u69cb\u6210\u8981\u7d20\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3001\u5c5e\u6027\u3001\u95a2\u4fc2\u3067\u3059\u3002\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u56fa\u6709\u306e\u8b58\u5225\u3092\u6301\u3064\u73fe\u5b9f\u4e16\u754c\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308a\u3001\u5c5e\u6027\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u95a2\u3059\u308b\u8ffd\u52a0\u60c5\u5831\u3092\u63d0\u4f9b\u3057\u3001\u95a2\u4fc2\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u63a5\u7d9a\u3092\u8aac\u660e\u3057\u307e\u3059\u3002\u57fa\u6570\u3068\u53c2\u52a0\u5ea6\u306f\u3001\u95a2\u4fc2\u306e\u5177\u4f53\u7684\u306a\u7279\u5fb4\u3092\u8a18\u8ff0\u3057\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u5168\u4f53\u50cf\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/div>\n<\/div>\n<div><\/div>\n<div><\/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\">\n<form class=\"stretch mx-2 flex flex-row gap-3 pt-2 last:mb-2 md:last:mb-6 lg:mx-auto lg:max-w-3xl lg:pt-6\">\n<div class=\"relative flex h-full flex-1 md:flex-col\">\n<div class=\"flex ml-1 mt-1.5 md:w-full md:m-auto md:mb-2 gap-0 md:gap-2 justify-center\">\n<h2>ER\u56f3\u306e\u7a2e\u985e<\/h2>\n<div class=\"flex-1 overflow-hidden\">\n<div class=\"react-scroll-to-bottom--css-ypbly-79elbk h-full dark:bg-gray-800\">\n<div class=\"react-scroll-to-bottom--css-ypbly-1n7m0yu\">\n<div class=\"flex flex-col items-center text-sm dark:bg-gray-800\">\n<div class=\"w-full border-b border-black\/10 dark:border-gray-900\/50 text-gray-800 dark:text-gray-100 group bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 m-auto md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0\">\n<div class=\"relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\">\n<div class=\"markdown prose w-full break-words dark:prose-invert dark\">\n<p>ER\u56f3\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u306b\u304a\u3051\u308b\u91cd\u8981\u306a\u30c4\u30fc\u30eb\u3067\u3042\u308a\u3001\u4e3b\u306b\u6982\u5ff5\u7684\u3001\u8ad6\u7406\u7684\u3001\u7269\u7406\u7684\u306e3\u3064\u306e\u30bf\u30a4\u30d7\u306b\u5206\u3051\u3089\u308c\u308b\u3002\u305d\u308c\u305e\u308c\u306e\u56f3\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u30d7\u30ed\u30bb\u30b9\u306e\u7570\u306a\u308b\u6bb5\u968e\u3067\u4f7f\u7528\u3055\u308c\u3001\u7570\u306a\u308b\u8a73\u7d30\u5ea6\u3092\u63d0\u4f9b\u3059\u308b\u3002<\/p>\n<ol>\n<li>ER\u56f3\u306e\u6700\u521d\u306e\u7a2e\u985e\u306f<strong>\u6982\u5ff5\u7684DFD<\/strong>\u30c7\u30fc\u30bf\u8981\u4ef6\u3068\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u306e\u9ad8\u30ec\u30d9\u30eb\u306a\u8996\u70b9\u3092\u63d0\u4f9b\u3059\u308b\u3002\u4e3b\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u305d\u306e\u95a2\u4fc2\u3092\u7279\u5b9a\u3057\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30e2\u30c7\u30eb\u306e\u660e\u78ba\u3067\u7c21\u6f54\u306a\u6982\u8981\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u3002\u6982\u5ff5\u7684ER\u56f3\u306f\u3001\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u3068\u958b\u767a\u8005\u9593\u306e\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u30c4\u30fc\u30eb\u3068\u3057\u3066\u3088\u304f\u4f7f\u7528\u3055\u308c\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u95a2\u4e0e\u3059\u308b\u3059\u3079\u3066\u306e\u4eba\u304c\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306b\u3064\u3044\u3066\u5171\u901a\u306e\u7406\u89e3\u3092\u6301\u3064\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306b\u7528\u3044\u3089\u308c\u308b\u3002<\/li>\n<\/ol>\n<p><img alt=\"Conceptual data model\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/10-conceptual-data-model-example.png\"\/><\/p>\n<p>2. ER\u56f3\u306e2\u756a\u76ee\u306e\u7a2e\u985e\u306f<strong>\u8ad6\u7406\u7684DFD<\/strong>\u95a2\u4fc2\u3001\u5c5e\u6027\u3001\u5236\u7d04\u3092\u542b\u3080\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u3092\u3088\u308a\u8a73\u7d30\u306b\u8868\u73fe\u3059\u308b\u3002\u8ad6\u7406\u7684ER\u56f3\u306f\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u3088\u308a\u8a73\u7d30\u306a\u8996\u70b9\u3092\u63d0\u4f9b\u3057\u3001\u6982\u5ff5\u30e2\u30c7\u30eb\u3092\u7cbe\u7dfb\u5316\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u3002\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u5177\u4f53\u7684\u306a\u5c5e\u6027\u3068\u95a2\u4fc2\u3092\u7279\u5b9a\u3057\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u3092\u652f\u914d\u3059\u308b\u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u3084\u5236\u7d04\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u7528\u3044\u3089\u308c\u308b\u3002\u8ad6\u7406\u7684ER\u56f3\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u306e\u8a2d\u8a08\u3084\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u304c\u30b7\u30b9\u30c6\u30e0\u306e\u8981\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u3002<\/p>\n<p><img alt=\"Logical data model\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/11-logical-data-model-example.png\"\/><\/p>\n<p id=\"laNpOvY\"><img alt=\"\" class=\"alignnone size-full wp-image-10711\" decoding=\"async\" height=\"218\" loading=\"lazy\" sizes=\"auto, (max-width: 703px) 100vw, 703px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/img_64006feb93eeb.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/img_64006feb93eeb.png 703w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/img_64006feb93eeb-300x93.png 300w\" width=\"703\"\/><\/p>\n<p>3. ER\u56f3\u306e3\u756a\u76ee\u306e\u7a2e\u985e\u306f<strong>\u7269\u7406\u7684DFD<\/strong>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u306e\u8a2d\u8a08\u306b\u4f7f\u7528\u3055\u308c\u3001\u7269\u7406\u7684\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u8a73\u7d30\u306a\u8868\u73fe\u3092\u63d0\u4f9b\u3059\u308b\u3002\u7269\u7406\u7684ER\u56f3\u306f\u8ad6\u7406\u7684\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u3092\u7269\u7406\u7684\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3001\u30c7\u30fc\u30bf\u578b\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3001\u30b9\u30c8\u30ec\u30fc\u30b8\u69cb\u9020\u306a\u3069\u306e\u8a73\u7d30\u3092\u542b\u3080\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u304c\u52b9\u7387\u7684\u3067\u30b9\u30b1\u30fc\u30e9\u30d6\u30eb\u3067\u3042\u308a\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u3002<\/p>\n<p><img alt=\"Physical data model\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/12-physical-data-model-example.png\"\/><\/p>\n<p>\u8981\u3059\u308b\u306b\u3001ER\u56f3\u306b\u306f3\u3064\u306e\u7a2e\u985e\u304c\u3042\u308b\uff1a\u6982\u5ff5\u7684\u3001\u8ad6\u7406\u7684\u3001\u7269\u7406\u7684\u3002\u6982\u5ff5\u7684ER\u56f3\u306f\u30c7\u30fc\u30bf\u8981\u4ef6\u3068\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u306e\u9ad8\u30ec\u30d9\u30eb\u306a\u8996\u70b9\u3092\u63d0\u4f9b\u3059\u308b\u304c\u3001\u8ad6\u7406\u7684ER\u56f3\u306f\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u3092\u3088\u308a\u8a73\u7d30\u306b\u8868\u73fe\u3057\u3001\u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u3084\u5236\u7d04\u3092\u5b9a\u7fa9\u3059\u308b\u3002\u7269\u7406\u7684ER\u56f3\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u306e\u8a2d\u8a08\u306b\u4f7f\u7528\u3055\u308c\u3001\u7269\u7406\u7684\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u8a73\u7d30\u306a\u8868\u73fe\u3092\u63d0\u4f9b\u3059\u308b\u3002\u305d\u308c\u305e\u308c\u306e\u56f3\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u30d7\u30ed\u30bb\u30b9\u306e\u7570\u306a\u308b\u6bb5\u968e\u3067\u4f7f\u7528\u3055\u308c\u3001\u7570\u306a\u308b\u8a73\u7d30\u5ea6\u3092\u63d0\u4f9b\u3059\u308b\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"flex justify-between\">\n<div class=\"text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-3 md:gap-4 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible\">\n<h2>ER\u56f3\u306e\u4f5c\u6210<\/h2>\n<p>ER\u56f3\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u306b\u304a\u3051\u308b\u91cd\u8981\u306a\u30b9\u30c6\u30c3\u30d7\u3067\u3042\u308b\u3002T<span style=\"font-size: 1.125rem;\">ER\u56f3\u3092\u4f5c\u6210\u3059\u308b\u306b\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u305d\u306e\u5c5e\u6027\u3092\u7279\u5b9a\u3057\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u5b9a\u7fa9\u3057\u3001\u57fa\u6570\u3068\u30e2\u30c0\u30ea\u30c6\u30a3\u3092\u5272\u308a\u5f53\u3066\u3001\u6700\u5f8c\u306b\u56f3\u9762\u4f5c\u6210\u30c4\u30fc\u30eb\u3084\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u4f7f\u3063\u3066ER\u56f3\u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\u3053\u308c\u3089\u306e\u624b\u9806\u306b\u5f93\u3046\u3053\u3068\u3067\u3001\u30c7\u30fc\u30bf\u8981\u4ef6\u3068\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u6b63\u78ba\u306b\u8868\u73fe\u3059\u308b\u660e\u78ba\u3067\u7c21\u6f54\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u8a2d\u8a08\u3067\u304d\u308b\u3002<\/span><\/p>\n<p><span style=\"font-size: 1.125rem;\">ER\u56f3\u3092\u4f5c\u6210\u3059\u308b\u969b\u306e\u624b\u9806\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3042\u308b\uff1a<\/span><\/p>\n<ol>\n<li><strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u305d\u306e\u5c5e\u6027\u3092\u7279\u5b9a\u3059\u308b\uff1a<\/strong>ER\u56f3\u3092\u4f5c\u6210\u3059\u308b\u6700\u521d\u306e\u30b9\u30c6\u30c3\u30d7\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u8868\u73fe\u3055\u308c\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u7279\u5b9a\u3059\u308b\u3053\u3068\u3067\u3042\u308b\u3002\u5404\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u56fa\u6709\u306e\u8b58\u5225\u5b50\u3092\u6301\u3061\u3001\u305d\u306e\u7279\u5fb4\u3092\u8aac\u660e\u3059\u308b\u5c5e\u6027\u3068\u95a2\u9023\u4ed8\u3051\u308b\u3079\u304d\u3067\u3042\u308b\u3002\u305f\u3068\u3048\u3070\u3001\u56f3\u66f8\u9928\u7528\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u8a2d\u8a08\u3059\u308b\u5834\u5408\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u66f8\u7c4d\u3001\u501f\u308a\u624b\u3001\u8457\u8005\u306a\u3069\u306b\u306a\u308b\u3060\u308d\u3046\u3002\u66f8\u7c4d\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u5c5e\u6027\u306b\u306f\u3001\u30bf\u30a4\u30c8\u30eb\u3001\u8457\u8005\u3001\u51fa\u7248\u8005\u3001ISBN\u306a\u3069\u304c\u542b\u307e\u308c\u308b\u3002<\/li>\n<li><strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u5b9a\u7fa9\u3059\u308b\uff1a<\/strong>ER\u56f3\u3092\u4f5c\u6210\u3059\u308b2\u756a\u76ee\u306e\u30b9\u30c6\u30c3\u30d7\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3042\u308b\u3002\u95a2\u4fc2\u3068\u306f2\u3064\u4ee5\u4e0a\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u63a5\u7d9a\u3067\u3042\u308a\u30011\u5bfe1\u30011\u5bfe\u591a\u3001\u591a\u5bfe\u591a\u306e\u3044\u305a\u308c\u304b\u3067\u3042\u308b\u3002\u5404\u95a2\u4fc2\u306b\u5bfe\u3057\u3066\u57fa\u6570\u3068\u30e2\u30c0\u30ea\u30c6\u30a3\u3092\u5272\u308a\u5f53\u3066\u3001\u95a2\u4fc2\u306e\u5177\u4f53\u7684\u306a\u7279\u5fb4\u3092\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/li>\n<li><strong>\u57fa\u6570\u3068\u30e2\u30c0\u30ea\u30c6\u30a3\u3092\u5272\u308a\u5f53\u3066\u308b\uff1a<\/strong>\u57fa\u6570\u3068\u30e2\u30c0\u30ea\u30c6\u30a3\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u306e\u91cd\u8981\u306a\u7279\u5fb4\u3067\u3042\u308b\u3002\u57fa\u6570\u306f\u3001\u95a2\u4fc2\u306b\u304a\u3044\u3066\u5225\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u6570\u3092\u793a\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u66f8\u7c4d\u306f1\u4eba\u307e\u305f\u306f\u8907\u6570\u306e\u8457\u8005\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u308b\u304c\u3001\u8457\u8005\u306f\u8907\u6570\u306e\u66f8\u7c4d\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u308b\u3002\u30e2\u30c0\u30ea\u30c6\u30a3\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u95a2\u4fc2\u306b\u304a\u3044\u3066\u5fc5\u8981\u306a\u53c2\u52a0\u30ec\u30d9\u30eb\u3092\u793a\u3057\u3001\u4efb\u610f\u307e\u305f\u306f\u5fc5\u9808\u306e\u3044\u305a\u308c\u304b\u3067\u3042\u308b\u3002<\/li>\n<li><strong>ER\u56f3\u3092\u4f5c\u6210\u3059\u308b\uff1a<\/strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u7279\u5b9a\u3057\u3001\u5c5e\u6027\u3092\u5b9a\u7fa9\u3057\u3001\u57fa\u6570\u3068\u30e2\u30c0\u30ea\u30c6\u30a3\u3092\u5272\u308a\u5f53\u3066\u305f\u5f8c\u3001ER\u56f3\u3092\u4f5c\u6210\u3059\u308b\u6bb5\u968e\u3067\u3042\u308b\u3002ER\u56f3\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u30c4\u30fc\u30eb\u306f\u591a\u6570\u5b58\u5728\u3057\u3001Visual Paradigm Online\u3001Visio\u3001Visual Paradigm Desktop Edition\u306a\u3069\u304c\u6319\u3052\u3089\u308c\u308b\u3002\u3053\u308c\u3089\u306e\u30c4\u30fc\u30eb\u306f\u3001ER\u56f3\u306e\u4f5c\u6210\u3001\u7de8\u96c6\u3001\u5909\u66f4\u3092\u5bb9\u6613\u306b\u884c\u3048\u308b\u307b\u304b\u3001\u30cb\u30fc\u30ba\u306b\u5fdc\u3058\u305f\u5e45\u5e83\u3044\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u63d0\u4f9b\u3059\u308b\u3002<\/li>\n<\/ol>\n<h2>ER\u56f3\u306e\u4f8b<\/h2>\n<p><img alt=\"How to Generate Data Specification from ERD? - YouTube\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/03\/maxresdefault.jpg\"\/><\/p>\n<p>ER\u56f3\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u30b7\u30b9\u30c6\u30e0\u306b\u304a\u3051\u308b\u591a\u69d8\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u95a2\u4fc2\u3092\u8868\u73fe\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u308b\u3002<span style=\"font-size: 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