{"id":9015,"date":"2026-01-10T08:01:51","date_gmt":"2026-01-10T00:01:51","guid":{"rendered":"https:\/\/blog.visual-paradigm.com\/ja\/beginners-guide-to-entity-relationship-er-diagrams\/"},"modified":"2026-01-10T08:01:51","modified_gmt":"2026-01-10T00:01:51","slug":"beginners-guide-to-entity-relationship-er-diagrams","status":"publish","type":"post","link":"https:\/\/blog.visual-paradigm.com\/ja\/beginners-guide-to-entity-relationship-er-diagrams\/","title":{"rendered":"\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30fb\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u30b7\u30c3\u30d7\uff08ER\uff09\u56f3\u5165\u9580\u30ac\u30a4\u30c9"},"content":{"rendered":"<h2>\u306f\u3058\u3081\u306b<\/h2>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30fb\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u30b7\u30c3\u30d7\uff08ER\uff09\u56f3\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u306b\u304a\u3044\u3066\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b7\u30b9\u30c6\u30e0\u5185\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u53ef\u8996\u5316\u3057\u3001\u30e2\u30c7\u30eb\u5316\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002ER\u56f3\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u69cb\u9020\u3084\u3001\u7570\u306a\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3069\u3046\u3057\u304c\u3069\u306e\u3088\u3046\u306b\u95a2\u4fc2\u3057\u3066\u3044\u308b\u304b\u3092\u7406\u89e3\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u3053\u306e\u5165\u9580\u30ac\u30a4\u30c9\u3067\u306f\u3001ER\u56f3\u306e\u57fa\u672c\u3092\u7d39\u4ecb\u3057\u3001\u4eba\u6c17\u306e\u3042\u308b\u56f3\u4f5c\u6210\u30c4\u30fc\u30eb\u300cVisual Paradigm Online\u300d\u3067\u5229\u7528\u53ef\u80fd\u306a\u591a\u6570\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u6d3b\u7528\u3057\u3066\u3001\u4f8b\u3092\u901a\u3058\u3066\u5b66\u3076\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h2>1. ER\u56f3\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2>\n<p>ER\u56f3\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3001\u5c5e\u6027\u3001\u95a2\u4fc2\u3092\u793a\u3059\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u306e\u8996\u899a\u7684\u8868\u73fe\u3067\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u8005\u3001\u958b\u767a\u8005\u3001\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u304c\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b7\u30b9\u30c6\u30e0\u306e\u69cb\u9020\u3068\u6319\u52d5\u3092\u7406\u89e3\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<p><img alt=\"Online ERD Tool\" decoding=\"async\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/09\/01-online-erd-tool.png\"\/><\/p>\n<h2>2. ER\u56f3\u306e\u69cb\u6210\u8981\u7d20<\/h2>\n<p>ER\u56f3\u306f\u4ee5\u4e0b\u306e\u4e3b\u306a\u69cb\u6210\u8981\u7d20\u3067\u69cb\u6210\u3055\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a<\/strong>\u5b9f\u4e16\u754c\u306e\u7269\u4f53\u3084\u6982\u5ff5\u3092\u8868\u3057\u3001\u305f\u3068\u3048\u3070\u9867\u5ba2\u3001\u88fd\u54c1\u3001\u5f93\u696d\u54e1\u306a\u3069\u3067\u3059\u3002<\/li>\n<li><strong>\u5c5e\u6027\uff1a<\/strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u6027\u8cea\u3084\u7279\u5fb4\u3092\u8868\u3057\u3001\u305f\u3068\u3048\u3070\u9867\u5ba2\u306e\u540d\u524d\u3084\u88fd\u54c1\u306e\u4fa1\u683c\u306a\u3069\u3067\u3059\u3002<\/li>\n<li><strong>\u95a2\u4fc2\uff1a<\/strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3069\u3046\u3057\u304c\u3069\u306e\u3088\u3046\u306b\u3064\u306a\u304c\u3063\u3066\u3044\u308b\u304b\u3001\u307e\u305f\u306f\u76f8\u4e92\u306b\u95a2\u4fc2\u3057\u3066\u3044\u308b\u304b\u3092\u793a\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>3. \u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u7a2e\u985e<\/h2>\n<p>ER\u56f3\u306b\u306f\u4e3b\u306b3\u3064\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u5f37\u529b\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a<\/strong>\u72ec\u7acb\u3057\u3066\u5b58\u5728\u3059\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3067\u3001\u9577\u65b9\u5f62\u3067\u8868\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a<\/strong>\u5b58\u5728\u306e\u305f\u3081\u306b\u4ed6\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff08\u89aa\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u547c\u3070\u308c\u308b\uff09\u306b\u4f9d\u5b58\u3059\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3067\u3059\u3002\u4e8c\u91cd\u306e\u9577\u65b9\u5f62\u3067\u8868\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>\u95a2\u9023\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a<\/strong>2\u3064\u306e\u4ed6\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u591a\u5bfe\u591a\u306e\u95a2\u4fc2\u3092\u8868\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3067\u3059\u3002<\/li>\n<\/ul>\n<h2>4. ER\u56f3\u306b\u304a\u3051\u308b\u95a2\u4fc2<\/h2>\n<p>\u95a2\u4fc2\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3069\u3046\u3057\u304c\u3069\u306e\u3088\u3046\u306b\u95a2\u9023\u3057\u3066\u3044\u308b\u304b\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u95a2\u4fc2\u306e\u7a2e\u985e\u306b\u306f\u4ee5\u4e0b\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>1\u5bfe1\uff081:1\uff09\uff1a<\/strong>1\u3064\u306e\u96c6\u5408\u5185\u306e\u5358\u4e00\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u3001\u5225\u306e\u96c6\u5408\u5185\u306e\u5358\u4e00\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u95a2\u9023\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li><strong>1\u5bfe\u591a\uff081:N\uff09\uff1a<\/strong>1\u3064\u306e\u96c6\u5408\u5185\u306e\u5358\u4e00\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u3001\u5225\u306e\u96c6\u5408\u5185\u306e\u8907\u6570\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u95a2\u4fc2\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li><strong>\u591a\u5bfe1\uff08N:1\uff09\uff1a<\/strong>1\u3064\u306e\u96c6\u5408\u5185\u306e\u8907\u6570\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u3001\u5225\u306e\u96c6\u5408\u5185\u306e\u5358\u4e00\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u95a2\u4fc2\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li><strong>\u591a\u5bfe\u591a\uff08N:N\uff09\uff1a<\/strong> 1\u3064\u306e\u96c6\u5408\u5185\u306e\u8907\u6570\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u3001\u5225\u306e\u96c6\u5408\u5185\u306e\u8907\u6570\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u3066\u3044\u308b\u3002<\/li>\n<\/ul>\n<h2>5. \u5c5e\u6027<\/h2>\n<p>\u5c5e\u6027\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u95a2\u3059\u308b\u8ffd\u52a0\u60c5\u5831\u3092\u63d0\u4f9b\u3059\u308b\u3002\u305d\u308c\u3089\u306f\u3001\u4ee5\u4e0b\u306e\u7a2e\u985e\u306b\u5206\u985e\u3067\u304d\u308b\u3002<\/p>\n<ul>\n<li><strong>\u5358\u7d14\u5c5e\u6027\uff1a<\/strong> \u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u5358\u4e00\u306e\u5024\u3092\u8868\u3059\u3002<\/li>\n<li><strong>\u8907\u5408\u5c5e\u6027\uff1a<\/strong> \u8907\u6570\u306e\u5358\u7d14\u5c5e\u6027\u3092\u542b\u3080\u3002<\/li>\n<li><strong>\u5c0e\u51fa\u5c5e\u6027\uff1a<\/strong> \u4ed6\u306e\u5c5e\u6027\u304b\u3089\u8a08\u7b97\u3067\u304d\u308b\u3002<\/li>\n<li><strong>\u8907\u6570\u5024\u5c5e\u6027\uff1a<\/strong> \u5358\u4e00\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u5bfe\u3057\u3066\u8907\u6570\u306e\u5024\u3092\u4fdd\u6301\u3059\u308b\u3002<\/li>\n<li><strong>\u30ad\u30fc\u5c5e\u6027\uff1a<\/strong> \u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u305d\u306e\u96c6\u5408\u5185\u3067\u4e00\u610f\u306b\u8b58\u5225\u3059\u308b\u3002<\/li>\n<\/ul>\n<h2>6. \u5361\u30bf\u30b7\u30c6\u30a3\uff08\u57fa\u6570\uff09<\/h2>\n<p>\u57fa\u6570\u306f\u95a2\u4fc2\u306b\u53c2\u52a0\u3059\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u6570\u3092\u793a\u3059\u3002\u6700\u5c0f\u5024\u3068\u6700\u5927\u5024\u3067\u8868\u3055\u308c\u3001\u901a\u5e38 (min, max) \u306e\u5f62\u5f0f\u3067\u8a18\u8ff0\u3055\u308c\u308b\u3002<\/p>\n<h2>7. ER\u56f3\u306e\u4f8b<\/h2>\n<p>\u56f3\u66f8\u9928\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u306e\u305f\u3081\u306e\u7c21\u5358\u306aER\u56f3\u3092\u4f5c\u6210\u3057\u307e\u3057\u3087\u3046\uff1a<\/p>\n<ul>\n<li>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a<code>\u672c<\/code>, <code>\u8457\u8005<\/code>, <code>\u56f3\u66f8\u9928<\/code>, <code>\u501f\u308a\u624b<\/code><\/li>\n<li>\u95a2\u4fc2\uff1a<code>\u8457\u8005\u304c\u672c\u3092\u57f7\u7b46\u3059\u308b<\/code>, <code>\u672c\u306f\u56f3\u66f8\u9928\u306b\u3042\u308b<\/code>, <code>\u501f\u308a\u624b\u304c\u672c\u3092\u501f\u308a\u308b<\/code><\/li>\n<\/ul>\n<h2>8. Visual Paradigm Online\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u4f7f\u3063\u3066\u5b66\u3076<\/h2>\n<p><a href=\"http:\/\/online.visual-paradigm.com\">Visual Paradigm Online<\/a>\u306f\u591a\u6570\u306e<a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/data-field-entity-relationship-diagram\/\">ER\u56f3\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8<\/a>\u4f8b\u3092\u901a\u3058\u3066\u5b66\u3076\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u59cb\u3081\u65b9\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\uff1a<\/p>\n<p id=\"CfFgEwc\"><img alt=\"\" class=\"alignnone size-full wp-image-20438\" decoding=\"async\" height=\"465\" loading=\"lazy\" sizes=\"auto, (max-width: 1121px) 100vw, 1121px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/09\/img_650bd238d03c8.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/09\/img_650bd238d03c8.png 1121w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/09\/img_650bd238d03c8-300x124.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/09\/img_650bd238d03c8-1030x427.png 1030w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/09\/img_650bd238d03c8-768x319.png 768w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/09\/img_650bd238d03c8-150x62.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/09\/img_650bd238d03c8-400x166.png 400w\" width=\"1121\"\/><\/p>\n<ol>\n<li><strong>\u767b\u9332\uff1a<\/strong>Visual Paradigm Online\u3067\u7121\u6599\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u9078\u629e\uff1a<\/strong>ER\u56f3\u306e\u4f8b\u3092\u542b\u3080\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u691c\u7d22\u3057\u307e\u3059\u3002\u8ca9\u58f2\u3001\u5728\u5eab\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u5206\u91ce\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u304c\u898b\u3064\u304b\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\uff1a<\/strong>\u81ea\u5206\u306e\u30cb\u30fc\u30ba\u306b\u5408\u3063\u305f\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u9078\u629e\u3057\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3001\u5c5e\u6027\u3001\u95a2\u4fc2\u3092\u8ffd\u52a0\u307e\u305f\u306f\u5909\u66f4\u3057\u3066\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u5b66\u3076\uff1a<\/strong>\u56f3\u306e\u69cb\u9020\u3068\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u5b66\u3073\u307e\u3059\u3002\u5c5e\u6027\u306e\u5b9a\u7fa9\u3084\u57fa\u6570\u306b\u6ce8\u610f\u3092\u6255\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li><strong>\u7df4\u7fd2\uff1a<\/strong>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u304b\u3089\u5b66\u3093\u3060\u5185\u5bb9\u3092\u3082\u3068\u306b\u3001\u81ea\u5206\u3067ER\u56f3\u3092\u521d\u3081\u3066\u4f5c\u6210\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ol>\n<h2>9. \u7d50\u8ad6<\/h2>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\uff08ER\uff09\u56f3\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u304a\u3088\u3073\u30c7\u30fc\u30bf\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002Visual Paradigm 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