{"id":144071,"date":"2024-11-01T04:41:31","date_gmt":"2024-10-31T20:41:31","guid":{"rendered":"https:\/\/server.hk\/cnblog\/144071\/"},"modified":"2024-11-01T04:41:31","modified_gmt":"2024-10-31T20:41:31","slug":"sql-%e8%aa%9e%e5%8f%a5%e4%bd%bf%e7%94%a8%e5%a4%96%e9%8d%b5%e4%bf%9d%e9%9a%9c%e6%95%b8%e6%93%9a%e5%ba%ab%e6%95%b8%e6%93%9a%e4%b8%80%e8%87%b4%e6%80%a7-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%a4%96%e9%8d%b5-sql","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/144071\/","title":{"rendered":"SQL \u8a9e\u53e5\u4f7f\u7528\u5916\u9375\u4fdd\u969c\u6578\u64da\u5eab\u6578\u64da\u4e00\u81f4\u6027 (\u6578\u64da\u5eab\u5916\u9375 sql \u8a9e\u53e5)"},"content":{"rendered":"<h1 id=\"sql-%e8%aa%9e%e5%8f%a5%e4%bd%bf%e7%94%a8%e5%a4%96%e9%8d%b5%e4%bf%9d%e9%9a%9c%e6%95%b8%e6%93%9a%e5%ba%ab%e6%95%b8%e6%93%9a%e4%b8%80%e8%87%b4%e6%80%a7-vqhJJCpGEF\">SQL \u8a9e\u53e5\u4f7f\u7528\u5916\u9375\u4fdd\u969c\u6578\u64da\u5eab\u6578\u64da\u4e00\u81f4\u6027<\/h1>\n<p>\u5728\u73fe\u4ee3\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u7684\u4e00\u81f4\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u70ba\u4e86\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\uff0c\u5916\u9375\uff08Foreign Key\uff09\u662f\u4e00\u500b\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5916\u9375\u7684\u6982\u5ff5\u3001\u5176\u5728 SQL \u8a9e\u53e5\u4e2d\u7684\u4f7f\u7528\uff0c\u4ee5\u53ca\u5982\u4f55\u901a\u904e\u5916\u9375\u4f86\u4fdd\u969c\u6578\u64da\u5eab\u7684\u6578\u64da\u4e00\u81f4\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%a4%96%e9%8d%b5%ef%bc%9f-vqhJJCpGEF\">\u4ec0\u9ebc\u662f\u5916\u9375\uff1f<\/h2>\n<p>\u5916\u9375\u662f\u4e00\u7a2e\u7d04\u675f\u689d\u4ef6\uff0c\u7528\u65bc\u5728\u5169\u500b\u8868\u4e4b\u9593\u5efa\u7acb\u95dc\u806f\u3002\u5b83\u6307\u5411\u53e6\u4e00\u500b\u8868\u7684\u4e3b\u9375\uff0c\u5f9e\u800c\u78ba\u4fdd\u6578\u64da\u7684\u53c3\u8003\u5b8c\u6574\u6027\u3002\u7576\u4e00\u500b\u8868\u4e2d\u7684\u67d0\u500b\u5b57\u6bb5\u88ab\u8a2d\u7f6e\u70ba\u5916\u9375\u6642\uff0c\u8a72\u5b57\u6bb5\u7684\u503c\u5fc5\u9808\u5728\u88ab\u53c3\u8003\u7684\u8868\u7684\u4e3b\u9375\u4e2d\u5b58\u5728\u3002\u9019\u6a23\u53ef\u4ee5\u9632\u6b62\u51fa\u73fe\u5b64\u7acb\u7684\u6578\u64da\uff0c\u5f9e\u800c\u7dad\u8b77\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/p>\n<h2 id=\"%e5%a4%96%e9%8d%b5%e7%9a%84%e4%bd%9c%e7%94%a8-vqhJJCpGEF\">\u5916\u9375\u7684\u4f5c\u7528<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u5916\u9375\u78ba\u4fdd\u4e86\u6578\u64da\u4e4b\u9593\u7684\u95dc\u806f\u6027\uff0c\u9632\u6b62\u4e86\u4e0d\u4e00\u81f4\u7684\u6578\u64da\u51fa\u73fe\u3002<\/li>\n<li><strong>\u6578\u64da\u7d04\u675f\uff1a<\/strong>\u901a\u904e\u5916\u9375\u7d04\u675f\uff0c\u53ef\u4ee5\u9650\u5236\u67d0\u4e9b\u64cd\u4f5c\uff0c\u4f8b\u5982\u522a\u9664\u6216\u66f4\u65b0\u64cd\u4f5c\uff0c\u5f9e\u800c\u4fdd\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002<\/li>\n<li><strong>\u6578\u64da\u95dc\u806f\uff1a<\/strong>\u5916\u9375\u4f7f\u5f97\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u53ef\u4ee5\u9032\u884c\u6709\u6548\u7684\u95dc\u806f\u67e5\u8a62\uff0c\u63d0\u5347\u4e86\u6578\u64da\u7684\u53ef\u7528\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8-sql-%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%a4%96%e9%8d%b5-vqhJJCpGEF\">\u5982\u4f55\u5728 SQL \u4e2d\u4f7f\u7528\u5916\u9375<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u5275\u5efa\u5916\u9375\u7684\u8a9e\u6cd5\u901a\u5e38\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE \u5b50\u8868 (\n    id INT PRIMARY KEY,\n    \u53c3\u8003_id INT,\n    FOREIGN KEY (\u53c3\u8003_id) REFERENCES \u7236\u8868(id)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>\u5b50\u8868<\/code>\u4e2d\u7684<code>\u53c3\u8003_id<\/code>\u5b57\u6bb5\u662f\u5916\u9375\uff0c\u5b83\u53c3\u8003\u4e86<code>\u7236\u8868<\/code>\u4e2d\u7684<code>id<\/code>\u5b57\u6bb5\u3002\u9019\u610f\u5473\u8457<code>\u5b50\u8868<\/code>\u4e2d\u7684\u6bcf\u4e00\u500b<code>\u53c3\u8003_id<\/code>\u503c\u90fd\u5fc5\u9808\u5728<code>\u7236\u8868<\/code>\u7684<code>id<\/code>\u4e2d\u5b58\u5728\u3002<\/p>\n<h3 id=\"%e5%a4%96%e9%8d%b5%e7%9a%84%e7%b4%84%e6%9d%9f%e8%a1%8c%e7%82%ba-vqhJJCpGEF\">\u5916\u9375\u7684\u7d04\u675f\u884c\u70ba<\/h3>\n<p>\u5916\u9375\u7684\u7d04\u675f\u884c\u70ba\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u9078\u9805\u4f86\u5b9a\u7fa9\uff1a<\/p>\n<ul>\n<li><strong>CASCADE\uff1a<\/strong>\u7576\u7236\u8868\u4e2d\u7684\u6578\u64da\u88ab\u522a\u9664\u6216\u66f4\u65b0\u6642\uff0c\u5b50\u8868\u4e2d\u7684\u76f8\u95dc\u6578\u64da\u4e5f\u6703\u81ea\u52d5\u522a\u9664\u6216\u66f4\u65b0\u3002<\/li>\n<li><strong>SET NULL\uff1a<\/strong>\u7576\u7236\u8868\u4e2d\u7684\u6578\u64da\u88ab\u522a\u9664\u6216\u66f4\u65b0\u6642\uff0c\u5b50\u8868\u4e2d\u7684\u5916\u9375\u5b57\u6bb5\u6703\u88ab\u8a2d\u7f6e\u70ba NULL\u3002<\/li>\n<li><strong>NO ACTION\uff1a<\/strong>\u5982\u679c\u7236\u8868\u4e2d\u7684\u6578\u64da\u88ab\u522a\u9664\u6216\u66f4\u65b0\uff0c\u800c\u5b50\u8868\u4e2d\u4ecd\u6709\u76f8\u95dc\u6578\u64da\uff0c\u5247\u64cd\u4f5c\u5c07\u88ab\u62d2\u7d55\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a4%96%e9%8d%b5%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e6%a1%88%e4%be%8b-vqhJJCpGEF\">\u5916\u9375\u7684\u5be6\u969b\u61c9\u7528\u6848\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<code>\u5b78\u751f<\/code>\u548c<code>\u8ab2\u7a0b<\/code>\u3002\u6bcf\u500b\u5b78\u751f\u53ef\u4ee5\u9078\u64c7\u591a\u9580\u8ab2\u7a0b\uff0c\u800c\u6bcf\u9580\u8ab2\u7a0b\u4e5f\u53ef\u4ee5\u6709\u591a\u500b\u5b78\u751f\u9078\u64c7\u3002\u9019\u6a23\u7684\u95dc\u4fc2\u53ef\u4ee5\u901a\u904e\u4e00\u500b\u4e2d\u4ecb\u8868<code>\u5b78\u751f\u8ab2\u7a0b<\/code>\u4f86\u5be6\u73fe\uff1a<\/p>\n<pre><code>CREATE TABLE \u5b78\u751f (\n    id INT PRIMARY KEY,\n    \u59d3\u540d VARCHAR(100)\n);\n\nCREATE TABLE \u8ab2\u7a0b (\n    id INT PRIMARY KEY,\n    \u8ab2\u7a0b\u540d\u7a31 VARCHAR(100)\n);\n\nCREATE TABLE \u5b78\u751f\u8ab2\u7a0b (\n    \u5b78\u751f_id INT,\n    \u8ab2\u7a0b_id INT,\n    FOREIGN KEY (\u5b78\u751f_id) REFERENCES \u5b78\u751f(id),\n    FOREIGN KEY (\u8ab2\u7a0b_id) REFERENCES \u8ab2\u7a0b(id)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>\u5b78\u751f\u8ab2\u7a0b<\/code>\u8868\u4e2d\u7684<code>\u5b78\u751f_id<\/code>\u548c<code>\u8ab2\u7a0b_id<\/code>\u90fd\u662f\u5916\u9375\uff0c\u5206\u5225\u53c3\u8003<code>\u5b78\u751f<\/code>\u548c<code>\u8ab2\u7a0b<\/code>\u8868\u7684\u4e3b\u9375\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6bcf\u500b\u5b78\u751f\u9078\u64c7\u7684\u8ab2\u7a0b\u90fd\u662f\u6709\u6548\u7684\uff0c\u5f9e\u800c\u4fdd\u969c\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-vqhJJCpGEF\">\u7e3d\u7d50<\/h2>\n<p>\u5916\u9375\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u5b83\u4e0d\u50c5\u80fd\u5920\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9084\u80fd\u5920\u4fc3\u9032\u6578\u64da\u4e4b\u9593\u7684\u6709\u6548\u95dc\u806f\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u5916\u9375\u7d04\u675f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u767c\u751f\uff0c\u5f9e\u800c\u63d0\u5347\u6578\u64da\u5eab\u7684\u6574\u9ad4\u8cea\u91cf\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u53ef\u7528\u6027\u548c\u9ad8\u4e00\u81f4\u6027\u7684\u61c9\u7528\u5834\u666f\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u8a2d\u8a08\u548c\u5916\u9375\u4f7f\u7528\u7b56\u7565\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\uff0c\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u5176\u4ed6\u61c9\u7528\uff0c\u5747\u53ef\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4f7f\u7528 SQL \u5916\u9375\u8a9e\u53e5\u4f86\u4fdd\u969c\u6578\u64da\u5eab\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0c\u78ba\u4fdd\u6578\u64da\u4e4b\u9593\u7684\u95dc\u806f\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-144071","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144071","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=144071"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144071\/revisions"}],"predecessor-version":[{"id":144072,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144071\/revisions\/144072"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=144071"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=144071"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=144071"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}