{"id":5433,"date":"2025-07-29T20:35:39","date_gmt":"2025-07-29T11:35:39","guid":{"rendered":"https:\/\/sky-peace.net\/?p=5433"},"modified":"2025-07-29T20:35:39","modified_gmt":"2025-07-29T11:35:39","slug":"er-howto-solve","status":"publish","type":"post","link":"https:\/\/sky-peace.net\/certified\/er-howto-solve\/","title":{"rendered":"ER\u56f3\u201c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u2010\u52d5\u8a5e\u201d\u554f\u984c\u653b\u7565\uff1a\u95a2\u9023\u8a18\u53f7\u3092\u8aad\u307f\u89e3\u304f4\u30b9\u30c6\u30c3\u30d7"},"content":{"rendered":"<p><!-- \u5c0e\u5165\u6587\uff08H2-0 \u76f8\u5f53\uff09 --><\/p>\n<p>IPA \u5fdc\u7528\u60c5\u5831\u30fb\u9ad8\u5ea6\u8a66\u9a13\u3067\u306f\u3001ER \u56f3\u306e \u201c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u2010\u52d5\u8a5e\u2010\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u201d \u304b\u3089 1:1 \u3084 1:N \u306a\u3069\u306e\u95a2\u9023\u8a18\u53f7\u3092\u9078\u3076\u8a2d\u554f\u304c\u983b\u51fa\u3067\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u95a2\u9023\u8a18\u53f7\u306e\u610f\u5473\u3068\u8aad\u307f\u53d6\u308a\u624b\u9806\u3092\u6574\u7406\u3057\u3001\u904e\u53bb\u554f\u306b\u5b66\u3073\u306a\u304c\u3089\u6b63\u89e3\u7387\u3092\u7740\u5b9f\u306b\u9ad8\u3081\u308b\u30b3\u30c4\u3092\u3084\u3055\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<p><!-- H2-1 --><\/p>\n<h2>\u57fa\u790e\u77e5\u8b58\uff1aER \u56f3\u306e\u95a2\u9023\u8a18\u53f7\u3068\u8aad\u307f\u65b9<\/h2>\n<h3>1. \u300c\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u300d\u3068\u300c\u30aa\u30d7\u30b7\u30e7\u30ca\u30ea\u30c6\u30a3\u300d\u3092\u5206\u3051\u3066\u8003\u3048\u308b<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u8a18\u53f7<\/th>\n<th>\u610f\u5473<\/th>\n<th>\u5178\u578b\u7684\u30d5\u30ec\u30fc\u30ba\u4f8b<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>1\uff1a1<\/strong><\/td>\n<td>\u53cc\u65b9\u304c\u3061\u3087\u3046\u3069 1 \u4ef6\u305a\u3064<\/td>\n<td>\u300c\u5bfe\u5fdc\u3059\u308b\u300d\u300c\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u300d<\/td>\n<\/tr>\n<tr>\n<td><strong>1\uff1aN<\/strong><\/td>\n<td>\u5de6\u304c 1\u3001\u53f3\u304c 0\u200a\uff5e\u200a\u591a<\/td>\n<td>\u300c\u6301\u3064\u300d\u300c\u542b\u3080\u300d\u300c\u6240\u5c5e\u3059\u308b\u300d<\/td>\n<\/tr>\n<tr>\n<td><strong>N\uff1aM<\/strong><\/td>\n<td>\u53cc\u65b9\u304c\u591a\u5bfe\u591a<\/td>\n<td>\u300c\u95a2\u9023\u3059\u308b\u300d\u300c\u7d10\u4ed8\u304f\u300d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>\u203b \u8a18\u53f7\u306e\u5de6\u53f3\u306f\u5fc5\u305a<strong>\u52d5\u8a5e\u3092\u66f8\u304f\u65b9\u5411<\/strong>\u3067\u5224\u65ad\u3057\u307e\u3059\u3002\u4e3b\u8a9e \u2192 \u8ff0\u8a9e \u2192 \u76ee\u7684\u8a9e\u306e\u6d41\u308c\u3092\u77e2\u5370\u306b\u7f6e\u304d\u63db\u3048\u308b\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u3002<\/em><\/p>\n<h3>2. \u52d5\u8a5e\u30d5\u30ec\u30fc\u30ba\u304b\u3089\u77ac\u6642\u306b\u63a8\u6e2c\u3059\u308b\u30b3\u30c4<\/h3>\n<ul>\n<li><strong>\u300c\u5404\u300d\u300c\u4e00\u3064\u306e\u300d<\/strong>\u306a\u3069\u6570\u91cf\u9650\u5b9a\u30ef\u30fc\u30c9\u304c\u3042\u308c\u3070 1 \u5074\u3092\u793a\u5506<br \/>\n      \u4f8b\uff1a<em>\u300c\u5404\u793e\u54e1\u306f1\u53f0\u306e PC \u3092\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u300d<\/em> \u2192 \u793e\u54e1 1\uff1a1 PC<\/li>\n<li><strong>\u8907\u6570\u5f62\u30fb\u300c\u8907\u6570\u306e\u300d<\/strong>\u304c\u51fa\u308c\u3070 N \u5074\u304c\u6fc3\u539a<br \/>\n      \u4f8b\uff1a<em>\u300c\u9867\u5ba2\u306f\u8907\u6570\u306e\u6ce8\u6587\u3092\u51fa\u3059\u300d<\/em> \u2192 \u9867\u5ba2 1\uff1aN \u6ce8\u6587<\/li>\n<li><strong>\u300c\u7d50\u3073\u4ed8\u304f\u300d\u300c\u95a2\u9023\u4ed8\u3051\u308b\u300d<\/strong>\u306f\u591a\u5bfe\u591a\u306e\u5178\u578b\u8a9e<br \/>\n      \uff08\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\u3092\u610f\u8b58\u3059\u308b\u3068\u899a\u3048\u3084\u3059\u3044\uff09<\/li>\n<\/ul>\n<h3>3. \u5fc5\u9808\uff0f\u4efb\u610f\uff08\u5b9f\u7dda\u30fb\u7834\u7dda\uff09\u306e\u5224\u5b9a\u30dd\u30a4\u30f3\u30c8<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u7dda\u7a2e<\/th>\n<th>\u610f\u5473<\/th>\n<th>\u30d2\u30f3\u30c8\u30ef\u30fc\u30c9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u5b9f\u7dda<\/strong><\/td>\n<td>0 \u3067\u306f\u306a\u304f\u5fc5\u305a 1 \u4ee5\u4e0a<\/td>\n<td>\u300c\u5fc5\u305a\u300d\u300c\u5fc5\u9808\u300d\u300c\u5e38\u306b\u300d<\/td>\n<\/tr>\n<tr>\n<td><strong>\u7834\u7dda<\/strong><\/td>\n<td>0 \u4ef6\u3082\u8a31\u5bb9\uff08\u4efb\u610f\uff09<\/td>\n<td>\u300c\u5834\u5408\u304c\u3042\u308b\u300d\u300c\u672a\u767b\u9332\u300d\u300c\u307e\u3060\u300d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6570\u91cf\u3068\u7dda\u7a2e\u306e 2 \u8ef8\u3067\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u306f<strong>\u6700\u5927 6 \u30d1\u30bf\u30fc\u30f3<\/strong>\u3002\u8a2d\u554f\u306f\u3053\u3053\u3092\u63fa\u3055\u3076\u308b\u306e\u3067\u3001<strong>\u6570\u91cf \u2192 \u7dda\u7a2e<\/strong>\u306e\u9806\u306b\u4e8c\u6bb5\u968e\u63a8\u8ad6\u3059\u308b\u3068\u30df\u30b9\u304c\u6e1b\u308a\u307e\u3059\u3002<\/p>\n<h3>4. \u56f3\u3067\u30a4\u30e1\u30fc\u30b8\u3092\u56fa\u3081\u308b<\/h3>\n<pre><code class=\"language-mermaid\">\nerDiagram\n  \u9867\u5ba2 ||--o{ \u6ce8\u6587 : \"\u767a\u6ce8\u3059\u308b\"\n  \u6ce8\u6587 ||--|{ \u6ce8\u6587\u660e\u7d30 : \"\u542b\u3080\"\n<\/code><\/pre>\n<ul>\n<li><strong>\u9867\u5ba2 ||&#8211;o{ \u6ce8\u6587<\/strong>\uff1a\u9867\u5ba2\u306f 0\u200a\uff5e\u200a\u591a\u306e\u6ce8\u6587\u3092\u767a\u6ce8\uff081\uff1aN\u3001\u9867\u5ba2\u5074\u5fc5\u9808\uff0f\u6ce8\u6587\u5074\u4efb\u610f\uff09<\/li>\n<li><strong>\u6ce8\u6587 ||&#8211;|{ \u6ce8\u6587\u660e\u7d30<\/strong>\uff1a\u6ce8\u6587\u306f 1\u200a\uff5e\u200a\u591a\u306e\u660e\u7d30\u3092\u542b\u3080\uff081\uff1aN\u3001\u53cc\u65b9\u5fc5\u9808\uff09<\/li>\n<\/ul>\n<h3>5. \u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff08\u554f\u984c\u3092\u8aad\u3080\u524d\u306b\u30bb\u30c3\u30c8\u3067\u601d\u3044\u51fa\u3059\uff09<\/h3>\n<ol>\n<li>\u4e3b\u8a9e\u2010\u52d5\u8a5e\u2010\u76ee\u7684\u8a9e\u3092\u77e2\u5370\u3067\u66f8\u304d\u63db\u3048\u308b<\/li>\n<li>\u6570\u91cf\u30ef\u30fc\u30c9\u3067 1\uff0fN \u3092\u6c7a\u5b9a<\/li>\n<li>\u5fc5\u9808\u8a9e\u3067\u5b9f\u7dda\uff0f\u7834\u7dda\u3092\u6c7a\u5b9a<\/li>\n<li>\u4e0d\u81ea\u7136\u306a\u9078\u629e\u80a2\u3092<strong>\u5148\u306b\u9664\u5916<\/strong>\uff08\u6642\u77ed\uff09<\/li>\n<\/ol>\n<p><!-- H2-2 --><\/p>\n<h2>\u904e\u53bb\u306e\u51fa\u984c\u4f8b\u3068\u8a73\u89e3<\/h2>\n<h3>\u4f8b\u984c\u2460\uff1a\u5e73\u621022\u5e74\u6625 \u5348\u524d \u554f29\u300c\u9867\u5ba2\u2010\u9280\u884c\u2010\u53e3\u5ea7\u300d<\/h3>\n<p><strong>\u8a2d\u554f\u8981\u65e8<\/strong><br \/>\n\u300c\u9867\u5ba2\u306f\u4e00\u822c\u306b\u8907\u6570\u306e\u9280\u884c\u306b\u9810\u91d1\u3059\u308b\u300d\u3068\u3044\u3046\u4e00\u6587\u3068 ER \u56f3\u304c\u4e0e\u3048\u3089\u308c\u3001<em>\u53e3\u5ea7\u8868\u306e\u5916\u90e8\u30ad\u30fc\u69cb\u6210<\/em>\u3092\u7b54\u3048\u308b\u554f\u984c\u3002<\/p>\n<h4>\u601d\u8003\u30d5\u30ed\u30fc<\/h4>\n<ol>\n<li><strong>\u4e3b\u8a9e\u2192\u76ee\u7684\u8a9e\u306e\u6570\u3092\u62bd\u51fa<\/strong><br \/>\n      \u300c\u9867\u5ba2\u306f\u2026\u8907\u6570\u306e\u9280\u884c\u306b\u2026\u300d\uff1d <em>\u9867\u5ba2 N\uff1aM \u9280\u884c<\/em>\u3002\u591a\u5bfe\u591a\u306e\u53ef\u80fd\u6027\u3092\u7591\u3046\u3002<\/li>\n<li><strong>\u4e2d\u9593\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u6709\u7121\u3092\u78ba\u8a8d<\/strong><br \/>\n      ER \u56f3\u306b\u300c\u53e3\u5ea7\u300d\u304c\u63cf\u304b\u308c\u3066\u3044\u308b \u2192 <em>\u9867\u5ba2 1\uff1aN \u53e3\u5ea7 N\uff1a1 \u9280\u884c<\/em> \u306b\u5206\u89e3\u3002<\/li>\n<li><strong>\u201c\u591a\u201d \u5074\u304c\u5916\u90e8\u30ad\u30fc<\/strong><br \/>\n      \u3088\u3063\u3066 <em>\u53e3\u5ea7\u8868\u306b\u306f\u9280\u884c\u756a\u53f7\u3068\u9867\u5ba2\u756a\u53f7\u306e 2 \u672c\u306e\u5916\u90e8\u30ad\u30fc<\/em>\u304c\u5165\u308b\u3002<\/li>\n<\/ol>\n<h4>\u30b3\u30c4<\/h4>\n<ul>\n<li>\u696d\u52d9\u6587\u306b\u300c\u8907\u6570\u306e\u2026\u300d\u304c 2 \u56de\u51fa\u305f\u3089 <strong>\u591a\u5bfe\u591a or \u9023\u95a2\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3<\/strong> \u3092\u307e\u305a\u7591\u3046\u3002<\/li>\n<li>\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u306f\u300c\u4e2d\u9593\u8868\u3092\u631f\u3081\u3070\u5fc5\u305a 1:N \u00d7 N:1\u300d\u306b\u306a\u308b\u3001\u3068\u899a\u3048\u3066\u304a\u304f\u3002<\/li>\n<\/ul>\n<hr>\n<h3>\u4f8b\u984c\u2461\uff1a\u5e73\u621019\u5e74\u6625 \u5348\u524d \u554f64\u300c\u55b6\u696d\u54e1\u2010\u5730\u57df\u2010\u62c5\u5f53\u5730\u57df\u300d<\/h3>\n<p><strong>\u8a2d\u554f\u8981\u65e8<\/strong><br \/>\n\u55b6\u696d\u54e1\u3068\u5730\u57df\u3092\u7d50\u3076 ER \u56f3\u306e\u7a7a\u6b04 a\u301cd \u306b\u5165\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u540d\u3092\u9078\u3076\u554f\u984c\u3002<\/p>\n<h4>\u601d\u8003\u30d5\u30ed\u30fc<\/h4>\n<ol>\n<li><strong>\u6570\u91cf\u30ef\u30fc\u30c9\u30c1\u30a7\u30c3\u30af<\/strong><br \/>\n      \u30fb\u300c\u55b6\u696d\u54e1\u306f\u8907\u6570\u306e\u62c5\u5f53\u5730\u57df\u3092\u3082\u3064\u300d\u2192 <em>\u55b6\u696d\u54e1 1\uff1aN \u62c5\u5f53\u5730\u57df<\/em><br \/>\n      \u30fb\u300c1 \u3064\u306e\u5730\u57df\u3092\u8907\u6570\u306e\u55b6\u696d\u54e1\u304c\u62c5\u5f53\u3059\u308b\u300d\u2192 <em>\u5730\u57df 1\uff1aN \u62c5\u5f53\u5730\u57df<\/em><br \/>\n      \u2192 \u62c5\u5f53\u5730\u57df\u304c\u9023\u95a2\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3060\u3068\u78ba\u5b9a\u3002<\/li>\n<li><strong>ER \u56f3\u306e\u77e2\u5370\u3092\u6c7a\u3081\u308b<\/strong><br \/>\n      \u55b6\u696d\u54e1\u2192\u62c5\u5f53\u5730\u57df\uff1a1\u2190N \uff0f \u5730\u57df\u2192\u62c5\u5f53\u5730\u57df\uff1a1\u2190N<\/li>\n<li><strong>\u7a7a\u6b04\u3092\u57cb\u3081\u308b<\/strong><br \/>\n      \u9023\u95a2\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u631f\u3093\u3060\u300c\u55b6\u696d\u54e1\u2010\u62c5\u5f53\u5730\u57df\u2010\u5730\u57df\u300d\u304c\u5b8c\u6210\u3002<\/li>\n<\/ol>\n<h4>\u30b3\u30c4<\/h4>\n<ul>\n<li><strong>\u591a\u5bfe\u591a\u3092\u898b\u629c\u304f\u30ad\u30fc\u30ef\u30fc\u30c9<\/strong>\uff1a\u300c\u8907\u6570\u306e A \u304c\u8907\u6570\u306e B \u306b\u2026\u300d\u306f 99 % \u591a\u5bfe\u591a\u3002<\/li>\n<li>\u9023\u95a2\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u3042\u308c\u3070<strong>\u4e21\u7aef\u306f\u5fc5\u305a 1:N<\/strong>\u3002\u6570\u3092\u6570\u3048\u76f4\u3059\u5fc5\u8981\u306a\u3057\u3002<\/li>\n<\/ul>\n<h3>\u307e\u3068\u3081\uff1a\u904e\u53bb\u554f\u306b\u5171\u901a\u3059\u308b 3 \u3064\u306e\u8996\u70b9<\/h3>\n<ol>\n<li><strong>\u6570\u91cf\u8a9e<\/strong>\uff08\u5404\uff0f\u8907\u6570\uff09\u2192 \u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3<\/li>\n<li><strong>\u5fc5\u9808\u8a9e<\/strong>\uff08\u5fc5\u305a\uff0f\u5e38\u306b\uff09\u2192 \u5b9f\u7dda\u304b\u7834\u7dda\u304b<\/li>\n<li><strong>\u591a\u5bfe\u591a\u30ad\u30fc\u30ef\u30fc\u30c9<\/strong> \u2192 \u9023\u95a2\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u63a2\u3059<\/li>\n<\/ol>\n<p><!-- H2-3 --><\/p>\n<h2>\u3064\u307e\u305a\u304d\u30dd\u30a4\u30f3\u30c8\u5fb9\u5e95\u89e3\u8aac<\/h2>\n<h3>1. \u300c\u65b9\u5411\u300d\u3068\u300c\u6700\u5c0f\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u300d\u306e\u53d6\u308a\u9055\u3048<\/h3>\n<p><strong>\u65b9\u5411\uff08\u77e2\u5370\uff09<\/strong>\u306f\u4e3b\u8a9e\u2192\u76ee\u7684\u8a9e\u3067\u56fa\u5b9a\u3002<br \/>\n<strong>\u6700\u5c0f\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3<\/strong>\u306f\u300c\u5fc5\u305a\uff0f\u5834\u5408\u304c\u3042\u308b\u300d\u3067\u5224\u65ad\u3002<\/p>\n<pre><code>\u9867\u5ba2\u306f\u30100 \u4ee5\u4e0a\u3011\u306e\u6ce8\u6587\u3092\u51fa\u3059 \u2192 1\uff5c0\u2026N\n\u6ce8\u6587\u306f\u3010\u5fc5\u305a\u30111 \u4eba\u306e\u9867\u5ba2\u306b\u5c5e\u3059\u308b \u2192 N\uff5c1<\/code><\/pre>\n<p>\u77e2\u5370\u3092\u9006\u306b\u63cf\u3044\u3066\u3082 1\uff5c0\u2026N \u304c 0\u2026N\uff5c1 \u306b\u306f<em>\u7d76\u5bfe<\/em>\u306b\u5165\u308c\u66ff\u308f\u3089\u306a\u3044\u70b9\u304c\u843d\u3068\u3057\u7a74\u3002<\/p>\n<h3>2. \u4f3c\u305f\u52d5\u8a5e\uff08\u767b\u9332\u3059\u308b\uff0f\u7ba1\u7406\u3059\u308b\uff0f\u6301\u3064\uff09\u306e\u5fae\u5dee<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u52d5\u8a5e<\/th>\n<th>\u6697\u793a\u3059\u308b\u8a18\u53f7<\/th>\n<th>\u899a\u3048\u65b9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u767b\u9332\u3059\u308b<\/strong><\/td>\n<td>1\uff1aN\uff08\u767b\u9332\u5074\u304c N\uff09<\/td>\n<td>\u30ec\u30b3\u30fc\u30c9\u304c\u5897\u3048\u308b\u30a4\u30e1\u30fc\u30b8<\/td>\n<\/tr>\n<tr>\n<td><strong>\u7ba1\u7406\u3059\u308b<\/strong><\/td>\n<td>1\uff1aN or N\uff1aM<\/td>\n<td>\u4e3b\u4f53\u306e\u7acb\u5834\u3067\u5909\u308f\u308b<\/td>\n<\/tr>\n<tr>\n<td><strong>\u6301\u3064 (have)<\/strong><\/td>\n<td>1\uff1aN \u304c\u5927\u534a<\/td>\n<td>\u6240\u6709\u306f\u591a\u5074\u304c\u300c\u6301\u305f\u308c\u308b\u300d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Tip:<\/strong> \u52d5\u8a5e\u3092\u300c\u30c7\u30fc\u30bf\u304c\u5897\u3048\u308b\u5411\u304d\u300d\u3067\u6349\u3048\u308b\u3068 1\/N \u5224\u5b9a\u304c\u901f\u3044\u3002<\/p>\n<h3>3. \u6982\u5ff5 ER \u3068\u8ad6\u7406 ER \u3067\u8a18\u53f7\u304c\u5909\u308f\u308b\u7f60<\/h3>\n<ul>\n<li><strong>\u6982\u5ff5 ER<\/strong>\uff1a\u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u512a\u5148 \u2192 \u4f8b\u300c\u793e\u54e1\u306f\u90e8\u7f72\u306b\u6240\u5c5e\u3059\u308b\u300d\u2192 <em>\u90e8\u7f72 1\uff1aN \u793e\u54e1<\/em><\/li>\n<li><strong>\u8ad6\u7406 ER<\/strong>\uff1a\u5b9f\u88c5\u5236\u7d04\u512a\u5148 \u2192 \u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\u3092\u631f\u3080\u3068 <em>1\uff1aN \u00d7 N\uff1a1<\/em> \u306b\u5206\u89e3<\/li>\n<\/ul>\n<p>\u8a66\u9a13\u3067\u306f\u300cER \u56f3\u306f\u8ad6\u7406\u30e2\u30c7\u30eb\u300d\u3068\u660e\u793a\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001<strong>\u9023\u95a2\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3<\/strong>\u306e\u6709\u7121\u3092\u5fc5\u305a\u30c1\u30a7\u30c3\u30af\uff01<\/p>\n<h3>4. \u201c\u30c0\u30df\u30fc\u5024\u201d \u60f3\u50cf\u3067 0\/1 \u3092\u6c7a\u3081\u308b\u6642\u77ed\u30c6\u30af<\/h3>\n<ol>\n<li>\u554f\u984c\u6587\u3092\u8aad\u307f\u3001\u300c\u307e\u3060\u767b\u9332\u3057\u3066\u3044\u306a\u3044\u30b1\u30fc\u30b9\u300d\u3092\u982d\u306b\u601d\u3044\u63cf\u304f\u3002<\/li>\n<li>\u305d\u306e\u30b1\u30fc\u30b9\u304c\u6210\u7acb \u2192 <strong>\u6700\u5c0f\u5024 0<\/strong>\uff08\u7834\u7dda\uff09<\/li>\n<li>\u6210\u7acb\u3057\u306a\u3044 \u2192 <strong>\u6700\u5c0f\u5024 1<\/strong>\uff08\u5b9f\u7dda\uff09<\/li>\n<\/ol>\n<p>\u4f8b\uff1a\u300c\u6ce8\u6587\u306f\u5fc5\u305a 1 \u3064\u4ee5\u4e0a\u306e\u660e\u7d30\u3092\u542b\u3080\u300d\u2192 \u660e\u7d30 0 \u4ef6\u306e\u6ce8\u6587\u3092\u60f3\u50cf \u2192 NG \u2192 <strong>\u5b9f\u7dda<\/strong>\u3002<\/p>\n<p><!-- H2-4 --><\/p>\n<h2>\u4eca\u5f8c\u306e\u51fa\u984c\u4e88\u60f3\u3068\u7df4\u7fd2\u554f\u984c<\/h2>\n<h3>1. \u51fa\u984c\u30c8\u30ec\u30f3\u30c9\u3092\u8aad\u3080<\/h3>\n<ul>\n<li><strong>\u30af\u30e9\u30a6\u30c9\uff0fSaaS \u6642\u4ee3\u306e ER \u56f3<\/strong><br \/>\n      \u30de\u30eb\u30c1\u30c6\u30ca\u30f3\u30c8\u69cb\u6210\uff08<code>Tenant<\/code> \u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff09\u304c\u8ffd\u52a0\u3055\u308c\u3001<em>\u30e6\u30fc\u30b6 1:N \u30c6\u30ca\u30f3\u30c8 N:1 \u30c7\u30fc\u30bf<\/em> \u306a\u3069\u4e09\u6bb5\u69cb\u9020\u304c\u554f\u308f\u308c\u308b\u30b1\u30fc\u30b9\u304c\u5897\u52a0\u3002<\/li>\n<li><strong>JSON \u578b\u5217 vs. \u6b63\u898f\u5316<\/strong><br \/>\n      RDB \u306b JSON \u3092\u683c\u7d0d\u3059\u308b\u8a2d\u8a08\u3068\u5f93\u6765\u306e\u6b63\u898f\u5316\u30c6\u30fc\u30d6\u30eb\u3092\u6bd4\u8f03\u3055\u305b\u308b\u554f\u984c\u304c\u3001\u4ee4\u548c 6 \u5e74\u6625 SC \u5348\u524d\u3067\u521d\u51fa\u3002<\/li>\n<li><strong>\u30ac\u30d0\u30ca\u30f3\u30b9\u8996\u70b9\u306e\u5236\u7d04<\/strong><br \/>\n      \u300cEU \u5c45\u4f4f\u8005\u306f\u5fc5\u305a PII \u7ba1\u7406\u30c6\u30fc\u30d6\u30eb\u3068\u9023\u643a\u300d\u306a\u3069\u3001\u5730\u57df\u30fb\u6cd5\u898f\u5236\u3092\u30d2\u30f3\u30c8\u306b\u6700\u5c0f\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u3092\u9078\u3070\u305b\u308b\u50be\u5411\u3002<\/li>\n<\/ul>\n<h3>2. \u4e88\u60f3\u7df4\u7fd2\u554f\u984c\uff082 \u984c\uff09<\/h3>\n<h4>Q1. \u30de\u30eb\u30c1\u30c6\u30ca\u30f3\u30c8 SaaS<\/h4>\n<p><em>\u30c6\u30ca\u30f3\u30c8\u306f\u8907\u6570\u306e\u30e6\u30fc\u30b6\u3092\u542b\u3080\u3002\u30e6\u30fc\u30b6\u306f 0 \u500b\u4ee5\u4e0a\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u53c2\u52a0\u3057\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306f\u5fc5\u305a 1 \u3064\u306e\u30c6\u30ca\u30f3\u30c8\u306b\u5c5e\u3059\u308b\u3002<\/em><\/p>\n<ul>\n<li>A: \u30c6\u30ca\u30f3\u30c8 <strong>1\uff1aN\uff08\u5b9f\u7dda\uff09<\/strong> \u30e6\u30fc\u30b6<\/li>\n<li>B: \u30e6\u30fc\u30b6 <strong>N\uff1aM\uff08\u7834\u7dda\uff09<\/strong> \u30d7\u30ed\u30b8\u30a7\u30af\u30c8<\/li>\n<li>C: \u30c6\u30ca\u30f3\u30c8 <strong>1\uff1aN\uff08\u5b9f\u7dda\uff09<\/strong> \u30d7\u30ed\u30b8\u30a7\u30af\u30c8<\/li>\n<\/ul>\n<h4>Q2. GDPR \u6e96\u62e0\u30c7\u30fc\u30bf\u7ba1\u7406<\/h4>\n<p><em>\u9867\u5ba2\u306f 1 \u3064\u306e\u56fd\u306b\u5c45\u4f4f\u3059\u308b\u3002EU \u57df\u5185\u306e\u9867\u5ba2\u306f\u5fc5\u305a PII \u7ba1\u7406\u30c6\u30fc\u30d6\u30eb\u306b\u767b\u9332\u3055\u308c\u308b\u304c\u3001\u305d\u306e\u4ed6\u306e\u9867\u5ba2\u306f\u767b\u9332\u3055\u308c\u306a\u3044\u5834\u5408\u3082\u3042\u308b\u3002<\/em><\/p>\n<ul>\n<li>\u9867\u5ba2 <strong>1\uff1aN\uff08\u5b9f\u7dda\uff09<\/strong> \u56fd<\/li>\n<li>\u9867\u5ba2 <strong>1\uff1a0\u2006or\u20061\uff08\u7834\u7dda\uff09<\/strong> PII \u7ba1\u7406<\/li>\n<\/ul>\n<p><!-- H2-5 --><\/p>\n<h2>\u6d3e\u751f\u8a9e\u30fb\u95a2\u9023\u30ad\u30fc\u30ef\u30fc\u30c9<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u30ab\u30c6\u30b4\u30ea<\/th>\n<th>\u30ad\u30fc\u30ef\u30fc\u30c9<\/th>\n<th>\u88dc\u8db3\u30e1\u30e2<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u5236\u7d04<\/strong><\/td>\n<td>\u5916\u90e8\u30ad\u30fc\uff08FK\uff09\u3001\u53c2\u7167\u6574\u5408\u6027\u3001ON DELETE CASCADE<\/td>\n<td>ER \u8a18\u53f7\uff1d\u5b9f\u88c5\u5236\u7d04\u306e\u88cf\u4ed8\u3051<\/td>\n<\/tr>\n<tr>\n<td><strong>\u6b63\u898f\u5316<\/strong><\/td>\n<td>\u7b2c 3 \u6b63\u898f\u5f62\u3001\u975e\u6b63\u898f\u5316\u3001\u30b9\u30ce\u30fc\u30d5\u30ec\u30fc\u30af<\/td>\n<td>\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u6c7a\u5b9a\u524d\u306b\u8a2d\u8a08\u30d1\u30bf\u30fc\u30f3\u3092\u78ba\u8a8d<\/td>\n<\/tr>\n<tr>\n<td><strong>\u30af\u30e9\u30a6\u30c9<\/strong><\/td>\n<td>\u30de\u30eb\u30c1\u30c6\u30ca\u30f3\u30c8\u3001\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0\u3001\u30c7\u30fc\u30bf\u30a2\u30a4\u30bd\u30ec\u30fc\u30b7\u30e7\u30f3<\/td>\n<td>\u201cTenant\u201d \u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u983b\u51fa<\/td>\n<\/tr>\n<tr>\n<td><strong>\u6cd5\u898f\u5236<\/strong><\/td>\n<td>GDPR\u3001\u500b\u4eba\u60c5\u5831\u4fdd\u8b77\u6cd5\u3001\u30c7\u30fc\u30bf\u30ed\u30fc\u30ab\u30ea\u30c6\u30a3<\/td>\n<td>0\/1 \u5224\u5b9a\u306b\u5f71\u97ff<\/td>\n<\/tr>\n<tr>\n<td><strong>ER \u8a18\u6cd5<\/strong><\/td>\n<td>Crow\u2019s Foot\u3001IE \u8a18\u6cd5\u3001UML \u30af\u30e9\u30b9\u56f3<\/td>\n<td>\u8a18\u53f7\u306e\u5f62\u72b6\u9055\u3044\u306b\u6ce8\u610f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u691c\u7d22\u30d2\u30f3\u30c8:<\/strong> <code>\"Crow's Foot\" \u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3<\/code> \u3084 <code>\u30de\u30eb\u30c1\u30c6\u30ca\u30f3\u30c8 ER \u56f3<\/code> \u3067\u753b\u50cf\u691c\u7d22\u3059\u308b\u3068\u3001\u52d5\u8a5e\u30d5\u30ec\u30fc\u30ba\u3068\u8a18\u53f7\u306e\u30bb\u30c3\u30c8\u3092\u8996\u899a\u5b66\u7fd2\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><!-- H2-6 --><\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<ol>\n<li><strong>\u6570\u91cf\u8a9e \u2192 \u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3 \u2192 \u7dda\u7a2e<\/strong><br \/>\n      \u4e3b\u8a9e\u2010\u52d5\u8a5e\u2010\u76ee\u7684\u8a9e\u3092\u77e2\u5370\u306b\u7f6e\u304d\u63db\u3048\u3001<em>\u6570\u91cf\u8a9e<\/em>\u3067 1\uff0fN \u3092\u3001<em>\u5fc5\u9808\u8a9e<\/em>\u3067\u5b9f\u7dda\uff0f\u7834\u7dda\u3092\u5224\u5b9a\u3059\u308b 2 \u6bb5\u30b9\u30c6\u30c3\u30d7\u304c\u6700\u901f\u30fb\u6700\u5c11\u30df\u30b9\u3002<\/li>\n<li><strong>\u591a\u5bfe\u591a\u30ad\u30fc\u30ef\u30fc\u30c9\u306f \u201c\u9023\u95a2\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u201d \u3092\u5373\u691c\u7d22<\/strong><br \/>\n      \u300c\u8907\u6570\u306e A \u304c\u8907\u6570\u306e B \u306b\u2026\u300d\u304c\u51fa\u305f\u77ac\u9593\u3001\u4e2d\u9593\u8868\u3092\u7591\u3044 <em>1:N \u00d7 N:1<\/em> \u306b\u5206\u89e3\u3059\u308b\u2015\u2015\u8a66\u9a13\u983b\u51fa\u306e\u9244\u677f\u30d1\u30bf\u30fc\u30f3\u3002<\/li>\n<li><strong>\u904e\u53bb\u554f\uff0b\u30c0\u30df\u30fc\u5024\u60f3\u50cf\u6cd5\u3067\u5b9f\u6226\u8010\u6027\u3092\u4ed8\u3051\u308b<\/strong><br \/>\n      \u554f\u984c\u6587\u3067 \u201c\u672a\u767b\u9332\u30b1\u30fc\u30b9\u201d \u3092\u60f3\u50cf\u3057 0\uff0f1 \u3092\u5373\u65ad\u3059\u308b\u30af\u30bb\u3092\u4ed8\u3051\u308b\u3068\u3001\u6700\u5c0f\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u306e\u8ff7\u3044\u304c\u6fc0\u6e1b\u3002\u65b0\u50be\u5411\uff08\u30de\u30eb\u30c1\u30c6\u30ca\u30f3\u30c8\u30fb\u6cd5\u898f\u5236\uff09\u3082\u540c\u30ed\u30b8\u30c3\u30af\u3067\u7a81\u7834\u53ef\u80fd\u3002<\/li>\n<\/ol>\n<p><strong>\u5b66\u7fd2\u30ed\u30fc\u30c9\u30de\u30c3\u30d7:<\/strong><\/p>\n<ul>\n<li>\u672c\u8a18\u4e8b\u3067\u6271\u3063\u305f\u4ee3\u8868 4 \u984c\u3092\u7d19\u306b\u66f8\u3044\u3066\u624b\u89e3\u304d<\/li>\n<li>Crow\u2019s Foot \u8a18\u53f7\u4ed8\u304d\u3067\u81ea\u5206\u306e\u696d\u52d9\u30c9\u30e1\u30a4\u30f3\u3092 3 \u4f8b ER \u56f3\u5316<\/li>\n<li>JSON \u578b\u5217 or \u30de\u30eb\u30c1\u30c6\u30ca\u30f3\u30c8\u306e\u5fdc\u7528\u554f\u984c\u3092\u81ea\u4f5c\u3057\u3001\u89e3\u8aac\u307e\u3067\u66f8\u304f<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>IPA 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