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\ud83d\udeab<\/h2>\n<p>\u53c2\u7167\u6574\u5408\u6027\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u95a2\u4fc2\u304c\u4e00\u8cab\u6027\u3092\u4fdd\u3064\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u89aa\u30c6\u30fc\u30d6\u30eb\u306b\u5b58\u5728\u3057\u306a\u3044\u884c\u3092\u53c2\u7167\u3059\u308b\u300c\u5b64\u5150\u30ec\u30b3\u30fc\u30c9\u300d\u3092\u9632\u304e\u307e\u3059\u3002<\/p>\n<h3>\u554f\u984c\u70b9<\/h3>\n<p>\u30e2\u30c7\u30eb\u5316\u306e\u904e\u7a0b\u3067\u3001\u30a2\u30fc\u30ad\u30c6\u30af\u30c8\u304c\u56f3\u306b\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3092\u5fd8\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u95a2\u4fc2\u3092\u8996\u899a\u7684\u306b\u5b9a\u7fa9\u3059\u308b\u3082\u306e\u306e\u3001\u5236\u7d04\u306e\u8ad6\u7406\u3092\u7701\u7565\u3057\u3066\u3057\u307e\u3046\u306e\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304c\u7121\u52b9\u306a\u30c7\u30fc\u30bf\u5165\u529b\u306b\u5bfe\u3057\u3066\u8106\u5f31\u306b\u306a\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001<em>\u6ce8\u6587<\/em>\u304c\u3001<em>\u88fd\u54c1<\/em>ID\u304c\u3001<em>\u88fd\u54c1<\/em>\u30c6\u30fc\u30d6\u30eb\u306b\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u7d50\u679c<\/h3>\n<ul>\n<li><strong>\u9023\u9396\u7684\u306a\u30a8\u30e9\u30fc\uff1a<\/strong>\u89aa\u30ec\u30b3\u30fc\u30c9\u3092\u524a\u9664\u3059\u308b\u3068\u3001\u5b50\u30ec\u30b3\u30fc\u30c9\u304c\u6709\u52b9\u306a\u30ea\u30f3\u30af\u3092\u6301\u305f\u306a\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u30af\u30a8\u30ea\u306e\u5931\u6557\uff1a<\/strong>\u30ea\u30f3\u30af\u304c\u5207\u65ad\u3055\u308c\u305f\u5834\u5408\u3001\u7d50\u5408\u30af\u30a8\u30ea\u306f\u4e88\u671f\u3057\u306a\u3044\u7d50\u679c\u3092\u8fd4\u3059\u304b\u3001\u5b8c\u5168\u306b\u5931\u6557\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u30ec\u30dd\u30fc\u30c8\u306e\u30a8\u30e9\u30fc\uff1a<\/strong>\u3053\u308c\u3089\u306e\u95a2\u4fc2\u306b\u4f9d\u5b58\u3059\u308b\u96c6\u8a08\u30af\u30a8\u30ea\u306f\u3001\u8aa4\u3063\u305f\u5408\u8a08\u5024\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>\u89e3\u6c7a\u7b56<\/h3>\n<p>ERD\u306b\u5916\u90e8\u30ad\u30fc\u3092\u660e\u793a\u7684\u306b\u30e2\u30c7\u30eb\u5316\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u89aa\u30ec\u30b3\u30fc\u30c9\u304c\u524a\u9664\u307e\u305f\u306f\u66f4\u65b0\u3055\u308c\u305f\u3068\u304d\u306b\u53d6\u308b\u3079\u304d\u884c\u52d5\u3092\u793a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4e00\u822c\u7684\u306a\u884c\u52d5\u306b\u306f\u4ee5\u4e0b\u304c\u542b\u307e\u308c\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>CASCADE\uff1a<\/strong>\u89aa\u304c\u5909\u66f4\u3055\u308c\u305f\u3068\u304d\u306b\u3001\u5b50\u30ec\u30b3\u30fc\u30c9\u3092\u81ea\u52d5\u7684\u306b\u524a\u9664\u307e\u305f\u306f\u66f4\u65b0\u3057\u307e\u3059\u3002<\/li>\n<li><strong>SET NULL\uff1a<\/strong>\u89aa\u30ec\u30b3\u30fc\u30c9\u304c\u524a\u9664\u3055\u308c\u305f\u5834\u5408\u3001\u5b50\u30ec\u30b3\u30fc\u30c9\u306e\u5916\u90e8\u30ad\u30fc\u3092null\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<li><strong>RESTRICT\uff1a<\/strong>\u5b50\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u306f\u3001\u89aa\u306e\u524a\u9664\u3092\u7981\u6b62\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u9069\u5207\u306a\u884c\u52d5\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u306f\u3001\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u6ce8\u6587\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u306f\u3001<em>\u4ed5\u5165\u5148<\/em>\u306e\u524a\u9664\u3092\u5236\u9650\u3059\u308b\u4e00\u65b9\u3067\u3001\u30a2\u30fc\u30ab\u30a4\u30d6\u6e08\u307f\u306e\u30a2\u30a4\u30c6\u30e0\u306b\u3064\u3044\u3066\u306f\u8a31\u53ef\u3059\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\ud83d\udee1\ufe0f<\/p>\n<h2>\u30df\u30b93\uff1a\u9069\u5207\u3067\u306a\u3044\u6b63\u898f\u5316\u306e\u5b9f\u8df5 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\u540c\u3058\u9867\u5ba2\u3084\u88fd\u54c1\u304c\u8907\u6570\u56de\u51fa\u73fe\u3059\u308b\u3002<\/li>\n<li><strong>\u66f4\u65b0\u306e\u6df7\u4e71\uff1a<\/strong> \u66f4\u65b0\u304c\u91cd\u8907\u30ec\u30b3\u30fc\u30c9\u306e\u3046\u30611\u3064\u306b\u306e\u307f\u9069\u7528\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/li>\n<li><strong>\u7d50\u5408\u306e\u66d6\u6627\u3055\uff1a<\/strong> \u30ad\u30fc\u306b\u57fa\u3065\u304f\u7d50\u5408\u30af\u30a8\u30ea\u304c\u3001\u4e88\u671f\u305b\u306c\u8907\u6570\u884c\u3092\u8fd4\u3059\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n<h3>\u89e3\u6c7a\u7b56<\/h3>\n<p>ERD\u306b\u5e38\u306b\u4e3b\u30ad\u30fc\u3092\u660e\u78ba\u306b\u6307\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u9375\u306e\u30a2\u30a4\u30b3\u30f3\u307e\u305f\u306f\u7279\u5b9a\u306e\u8868\u8a18\u3067\u30de\u30fc\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5217\u304cNOT NULL\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u81ea\u7136\u30ad\u30fc\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u91cd\u8907\u3092\u9632\u3050\u305f\u3081\u306b\u4e00\u610f\u5236\u7d04\u3092\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4eee\u60f3\u30ad\u30fc\u306e\u5834\u5408\u306f\u3001\u751f\u6210\u30e1\u30ab\u30cb\u30ba\u30e0\u304c\u4fe1\u983c\u6027\u304c\u3042\u308a\u3001\u7af6\u5408\u304c\u751f\u3058\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002 \ud83d\udd12<\/p>\n<h2>\u30df\u30b97\uff1a\u547d\u540d\u898f\u5247\u306e\u4e0d\u7d71\u4e00 \ud83c\udff7\ufe0f<\/h2>\n<p>\u898b\u305f\u76ee\u4e0a\u306e\u554f\u984c\u306b\u601d\u3048\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u547d\u540d\u898f\u5247\u306f\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u306b\u76f4\u63a5\u5f71\u97ff\u3057\u307e\u3059\u3002\u4e00\u8cab\u6027\u306e\u306a\u3044\u540d\u524d\u306f\u6df7\u4e71\u3092\u62db\u304d\u3001\u91cd\u8907\u3057\u305f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u4f5c\u6210\u3092\u5f15\u304d\u8d77\u3053\u3057\u307e\u3059\u3002<\/p>\n<h3>\u554f\u984c\u70b9<\/h3>\n<p>1\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u306f<code>user_id<\/code>\u3092\u4f7f\u7528\u3059\u308b\u4e00\u65b9\u3067\u3001\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u306f<code>UserID<\/code>\u307e\u305f\u306f<code>userIdentifier<\/code>\u958b\u767a\u8005\u304c\u30af\u30a8\u30ea\u3092\u69cb\u7bc9\u3059\u308b\u969b\u306b\u3001\u3053\u308c\u3089\u3092\u6df7\u540c\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u9593\u9055\u3063\u305f\u5217\u3067\u7d50\u5408\u3057\u305f\u308a\u3001\u65e2\u5b58\u306e\u30c7\u30fc\u30bf\u3092\u91cd\u8907\u3055\u305b\u308b\u65b0\u3057\u3044\u5217\u3092\u4f5c\u6210\u3057\u305f\u308a\u3059\u308b\u539f\u56e0\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u540c\u7fa9\u8a9e\u306b\u6c17\u3065\u3044\u3066\u3044\u306a\u3044\u305f\u3081\u3067\u3059\u3002<\/p>\n<h3>\u7d50\u679c<\/h3>\n<ul>\n<li><strong>\u7d71\u5408\u5931\u6557\uff1a<\/strong>\u7570\u306a\u308b\u30e2\u30b8\u30e5\u30fc\u30eb\u304b\u3089\u306e\u30c7\u30fc\u30bf\u3092\u6b63\u3057\u304f\u7d50\u5408\u3067\u304d\u307e\u305b\u3093\u3002<\/li>\n<li><strong>\u4fdd\u5b88\u8ca0\u62c5\uff1a<\/strong>\u958b\u767a\u8005\u306f\u3001\u5404\u5217\u306e\u610f\u5473\u3092\u89e3\u8aad\u3059\u308b\u306e\u306b\u6642\u9593\u3092\u8cbb\u3084\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u30b9\u30ad\u30fc\u30de\u306e\u305a\u308c\uff1a<\/strong>\u6642\u9593\u3068\u3068\u3082\u306b\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u306f\u65ad\u7247\u5316\u3055\u308c\u3001\u4e00\u8cab\u6027\u3092\u5931\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>\u89e3\u6c7a\u7b56<\/h3>\n<p>\u53b3\u683c\u306a\u547d\u540d\u898f\u5247\u3092\u8a2d\u3051\u307e\u3057\u3087\u3046\u3002\u5217\u540d\u306b\u306f\u5c0f\u6587\u5b57\u3068\u30a2\u30f3\u30c0\u30fc\u30b9\u30b3\u30a2\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30c6\u30fc\u30d6\u30eb\u540d\u306b\u306f\u8907\u6570\u5f62\u306e\u540d\u8a5e\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\uff08\u4f8b\uff1a<code>orders<\/code>\u3001<code>order<\/code>\u306a\u3069\uff09\u3002\u95a2\u9023\u3059\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u540c\u3058\u5916\u90e8\u30ad\u30fc\u540d\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u3089\u306e\u898f\u5247\u3092\u30c7\u30fc\u30bf\u8f9e\u66f8\u306b\u8a18\u9332\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u4e00\u8cab\u6027\u306b\u3088\u308a\u3001\u958b\u767a\u8005\u306e\u8a8d\u77e5\u8ca0\u8377\u304c\u8efd\u6e1b\u3055\u308c\u3001\u30a8\u30e9\u30fc\u304c\u6700\u5c0f\u9650\u306b\u6291\u3048\u3089\u308c\u307e\u3059\u3002 \ud83d\udcd6<\/p>\n<h2>\u4e00\u822c\u7684\u306a\u30e2\u30c7\u30eb\u5316\u30a8\u30e9\u30fc\u306e\u6982\u8981<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u30df\u30b9\u306e\u30ab\u30c6\u30b4\u30ea<\/th>\n<th>\u4e3b\u306a\u30ea\u30b9\u30af<\/th>\n<th>\u63a8\u5968\u3055\u308c\u308b\u4fee\u6b63<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u66d6\u6627\u306a\u57fa\u6570<\/td>\n<td>\u91cd\u8907\u307e\u305f\u306f\u30c7\u30fc\u30bf\u5236\u9650<\/td>\n<td>1:1\u30011:N\u3001M:N\u3092\u660e\u78ba\u306b\u5b9a\u7fa9\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u5916\u90e8\u30ad\u30fc\u306e\u6b20\u843d<\/td>\n<td>\u5b64\u7acb\u3057\u305f\u30ec\u30b3\u30fc\u30c9<\/td>\n<td>\u53c2\u7167\u6574\u5408\u6027\u5236\u7d04\u3092\u5f37\u5236\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u4e0d\u5341\u5206\u306a\u6b63\u898f\u5316<\/td>\n<td>\u66f4\u65b0\/\u633f\u5165\u306e\u7570\u5e38<\/td>\n<td>1NF\u30012NF\u30013NF\u306e\u30eb\u30fc\u30eb\u3092\u9069\u7528\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u8aa4\u3063\u305f\u30c7\u30fc\u30bf\u578b<\/td>\n<td>\u8a08\u7b97\u304a\u3088\u3073\u691c\u8a3c\u30a8\u30e9\u30fc<\/td>\n<td>\u660e\u78ba\u306a\u30c9\u30e1\u30a4\u30f3\u3068\u578b\u3092\u6307\u5b9a\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u518d\u5e30\u7684\u30eb\u30fc\u30d7<\/td>\n<td>\u30af\u30a8\u30ea\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8<\/td>\n<td>\u968e\u5c64\u306e\u6df1\u3055\u3092\u5236\u9650\u3057\u3001\u5faa\u74b0\u3092\u78ba\u8a8d\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u5f31\u3044\u4e3b\u30ad\u30fc<\/td>\n<td>\u91cd\u8907\u30ec\u30b3\u30fc\u30c9<\/td>\n<td>\u4e00\u610f\u6027 + NULL\u8a31\u53ef\u306a\u3057\u3092\u5f37\u5236\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u547d\u540d\u306e\u4e0d\u6574\u5408<\/td>\n<td>\u7d71\u5408\u5931\u6557<\/td>\n<td>\u53b3\u683c\u306a\u547d\u540d\u898f\u5247\u3092\u63a1\u7528\u3059\u308b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u5805\u7262\u306aERD\u8a2d\u8a08\u306e\u305f\u3081\u306e\u6226\u7565 \ud83d\udee0\ufe0f<\/h2>\n<p>\u3053\u308c\u3089\u306e\u30df\u30b9\u3092\u9632\u3050\u306b\u306f\u3001\u53b3\u683c\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u304c\u5fc5\u8981\u3067\u3059\u3002\u5358\u306b\u7dda\u3092\u5f15\u304f\u3060\u3051\u3067\u306f\u4e0d\u5341\u5206\u3067\u3059\u3002\u8ad6\u7406\u3092\u691c\u8a3c\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u30e2\u30c7\u30eb\u304c\u691c\u67fb\u306b\u8010\u3048\u3046\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306e\u6226\u7565\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u540c\u50da\u30ec\u30d3\u30e5\u30fc\uff1a<\/strong>\u5225\u306e\u30a2\u30fc\u30ad\u30c6\u30af\u30c8\u306b\u56f3\u9762\u3092\u30ec\u30d3\u30e5\u30fc\u3057\u3066\u3082\u3089\u3046\u3002\u65b0\u9bae\u306a\u76ee\u306f\u3001\u4f5c\u6210\u8005\u304c\u898b\u9003\u3059\u8ad6\u7406\u7684\u306a\u7a74\u3092\u767a\u898b\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3002<\/li>\n<li><strong>\u30e2\u30c3\u30af\u30c7\u30fc\u30bf\u30c6\u30b9\u30c8\uff1a<\/strong>\u5b9f\u88c5\u306e\u524d\u306b\u3001\u30b5\u30f3\u30d7\u30eb\u30c7\u30fc\u30bf\u3067\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u57cb\u3081\u308b\u3002\u8a2d\u8a08\u3057\u305f\u30eb\u30fc\u30eb\u3092\u7834\u308d\u3046\u3068\u8a66\u307f\u308b\u3002\u30b7\u30b9\u30c6\u30e0\u304c\u305d\u308c\u3092\u963b\u6b62\u3059\u308b\u304b\u3069\u3046\u304b\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li><strong>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u4f5c\u6210\uff1a<\/strong>ERD\u3068\u3068\u3082\u306b\u30c7\u30fc\u30bf\u8f9e\u66f8\u3092\u4f5c\u6210\u3059\u308b\u3002\u3059\u3079\u3066\u306e\u95a2\u4fc2\u6027\u3068\u5236\u7d04\u306e\u80cc\u5f8c\u306b\u3042\u308b\u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u3092\u8aac\u660e\u3059\u308b\u3002<\/li>\n<li><strong>\u53cd\u5fa9\u7684\u8a2d\u8a08\uff1a<\/strong>\u6700\u521d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u5b8c\u74a7\u3067\u3042\u308b\u3068\u671f\u5f85\u3057\u3066\u306f\u306a\u3089\u306a\u3044\u3002\u30d3\u30b8\u30cd\u30b9\u8981\u4ef6\u306e\u5909\u5316\u306b\u5fdc\u3058\u3066\u30e2\u30c7\u30eb\u3092\u6539\u5584\u3057\u7d9a\u3051\u308b\u3053\u3068\u3002<\/li>\n<\/ul>\n<h2>\u5b9f\u88c5\u524d\u306e\u691c\u8a3c\u6280\u8853 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NULL\u3068\u3057\u3066\u30de\u30fc\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ol>\n<p>\u3053\u306e\u6bb5\u968e\u3067\u306f\u3001\u8996\u899a\u7684\u306a\u56f3\u3067\u306f\u73fe\u308c\u306a\u3044\u5b9f\u88c5\u30a8\u30e9\u30fc\u3092\u767a\u898b\u3067\u304d\u307e\u3059\u3002\u7406\u8ad6\u3068\u73fe\u5b9f\u306e\u30ae\u30e3\u30c3\u30d7\u3092\u57cb\u3081\u308b\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002 \ud83d\udd2c<\/p>\n<h2>\u6642\u9593\u306e\u7d4c\u904e\u306b\u4f34\u3046\u30b9\u30ad\u30fc\u30de\u306e\u7dad\u6301 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