{"id":79410,"date":"2024-10-16T13:05:15","date_gmt":"2024-10-16T05:05:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79410\/"},"modified":"2024-10-16T13:05:16","modified_gmt":"2024-10-16T05:05:16","slug":"mysql%e6%8c%87%e4%bb%a4-primary-key%ef%bc%88%e4%b8%bb%e9%8d%b5%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79410\/","title":{"rendered":"MySQL\u6307\u4ee4: PRIMARY KEY\uff08\u4e3b\u9375\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-primary-key%ef%bc%88%e4%b8%bb%e9%8d%b5%ef%bc%89-RkhjuOEYRW\">MySQL\u6307\u4ee4: PRIMARY KEY\uff08\u4e3b\u9375\uff09<\/h1>\n<p>\u5728\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u4e2d\uff0c\u4e3b\u9375\uff08PRIMARY KEY\uff09\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6982\u5ff5\u3002\u5b83\u7528\u65bc\u552f\u4e00\u6a19\u8b58\u8cc7\u6599\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u8cc7\u6599\uff0c\u78ba\u4fdd\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684\u4e3b\u9375\uff0c\u5305\u62ec\u5176\u5b9a\u7fa9\u3001\u7279\u6027\u3001\u4f7f\u7528\u65b9\u6cd5\u53ca\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e4%b8%bb%e9%8d%b5%ef%bc%9f-RkhjuOEYRW\">\u4ec0\u9ebc\u662f\u4e3b\u9375\uff1f<\/h2>\n<p>\u4e3b\u9375\u662f\u4e00\u500b\u6216\u591a\u500b\u6b04\u4f4d\u7684\u7d44\u5408\uff0c\u9019\u4e9b\u6b04\u4f4d\u7684\u503c\u5fc5\u9808\u662f\u552f\u4e00\u7684\uff0c\u4e26\u4e14\u4e0d\u80fd\u70ba\u7a7a\u3002\u4e3b\u9375\u7684\u4e3b\u8981\u529f\u80fd\u662f\u78ba\u4fdd\u8cc7\u6599\u8868\u4e2d\u6bcf\u4e00\u884c\u8cc7\u6599\u7684\u552f\u4e00\u6027\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u91cd\u8907\u7684\u8cc7\u6599\u9032\u5165\u8cc7\u6599\u5eab\u3002<\/p>\n<h2 id=\"%e4%b8%bb%e9%8d%b5%e7%9a%84%e7%89%b9%e6%80%a7-RkhjuOEYRW\">\u4e3b\u9375\u7684\u7279\u6027<\/h2>\n<ul>\n<li><strong>\u552f\u4e00\u6027\uff1a<\/strong>\u4e3b\u9375\u7684\u6bcf\u4e00\u500b\u503c\u5fc5\u9808\u662f\u552f\u4e00\u7684\uff0c\u9019\u610f\u5473\u8457\u5728\u8cc7\u6599\u8868\u4e2d\u4e0d\u6703\u6709\u5169\u884c\u8cc7\u6599\u64c1\u6709\u76f8\u540c\u7684\u4e3b\u9375\u503c\u3002<\/li>\n<li><strong>\u975e\u7a7a\u6027\uff1a<\/strong>\u4e3b\u9375\u6b04\u4f4d\u4e0d\u80fd\u5305\u542b\u7a7a\u503c\uff08NULL\uff09\uff0c\u9019\u662f\u56e0\u70ba\u7a7a\u503c\u7121\u6cd5\u7528\u4f86\u552f\u4e00\u6a19\u8b58\u4e00\u884c\u8cc7\u6599\u3002<\/li>\n<li><strong>\u7a69\u5b9a\u6027\uff1a<\/strong>\u4e3b\u9375\u7684\u503c\u61c9\u8a72\u5728\u8cc7\u6599\u7684\u751f\u547d\u9031\u671f\u5167\u4fdd\u6301\u4e0d\u8b8a\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u56e0\u70ba\u4e3b\u9375\u7684\u8b8a\u66f4\u800c\u5c0e\u81f4\u7684\u8cc7\u6599\u4e0d\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e5%ae%9a%e7%be%a9%e4%b8%bb%e9%8d%b5-RkhjuOEYRW\">\u5982\u4f55\u5728MySQL\u4e2d\u5b9a\u7fa9\u4e3b\u9375<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u5728\u5275\u5efa\u8cc7\u6599\u8868\u6642\u5b9a\u7fa9\u4e3b\u9375\uff0c\u4e5f\u53ef\u4ee5\u5728\u8cc7\u6599\u8868\u5df2\u5b58\u5728\u7684\u60c5\u6cc1\u4e0b\u6dfb\u52a0\u4e3b\u9375\u3002\u4ee5\u4e0b\u662f\u5169\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e5%89%b5%e5%bb%ba%e8%b3%87%e6%96%99%e8%a1%a8%e6%99%82%e5%ae%9a%e7%be%a9%e4%b8%bb%e9%8d%b5-RkhjuOEYRW\">1. \u5275\u5efa\u8cc7\u6599\u8868\u6642\u5b9a\u7fa9\u4e3b\u9375<\/h3>\n<pre><code>CREATE TABLE users (\n    id INT AUTO_INCREMENT,\n    username VARCHAR(50) NOT NULL,\n    email VARCHAR(100) NOT NULL,\n    PRIMARY KEY (id)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c`id`\u6b04\u4f4d\u88ab\u5b9a\u7fa9\u70ba\u4e3b\u9375\uff0c\u4e26\u4e14\u4f7f\u7528\u4e86\u81ea\u52d5\u589e\u91cf\uff08AUTO_INCREMENT\uff09\u7279\u6027\uff0c\u9019\u6a23\u6bcf\u6b21\u63d2\u5165\u65b0\u8cc7\u6599\u6642\uff0c`id`\u7684\u503c\u6703\u81ea\u52d5\u589e\u52a0\u3002<\/p>\n<h3 id=\"2-%e5%9c%a8%e5%b7%b2%e5%ad%98%e5%9c%a8%e7%9a%84%e8%b3%87%e6%96%99%e8%a1%a8%e4%b8%ad%e6%b7%bb%e5%8a%a0%e4%b8%bb%e9%8d%b5-RkhjuOEYRW\">2. \u5728\u5df2\u5b58\u5728\u7684\u8cc7\u6599\u8868\u4e2d\u6dfb\u52a0\u4e3b\u9375<\/h3>\n<pre><code>ALTER TABLE users\nADD PRIMARY KEY (username);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5c07`username`\u6b04\u4f4d\u8a2d\u7f6e\u70ba\u4e3b\u9375\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c`username`\u6b04\u4f4d\u5fc5\u9808\u662f\u552f\u4e00\u7684\uff0c\u5426\u5247\u6703\u5c0e\u81f4\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e4%b8%bb%e9%8d%b5%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-RkhjuOEYRW\">\u4e3b\u9375\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u9078\u64c7\u5408\u9069\u7684\u6b04\u4f4d\uff1a<\/strong>\u9078\u64c7\u4e00\u500b\u4e0d\u6703\u8b8a\u66f4\u7684\u6b04\u4f4d\u4f5c\u70ba\u4e3b\u9375\uff0c\u4f8b\u5982\u81ea\u52d5\u589e\u91cf\u7684\u6574\u6578\u6b04\u4f4d\uff0c\u901a\u5e38\u662f\u6700\u4f73\u9078\u64c7\u3002<\/li>\n<li><strong>\u907f\u514d\u4f7f\u7528\u8907\u96dc\u7684\u4e3b\u9375\uff1a<\/strong>\u96d6\u7136\u53ef\u4ee5\u4f7f\u7528\u591a\u500b\u6b04\u4f4d\u4f5c\u70ba\u4e3b\u9375\uff0c\u4f46\u9019\u6703\u589e\u52a0\u67e5\u8a62\u7684\u8907\u96dc\u6027\uff0c\u5efa\u8b70\u76e1\u91cf\u4f7f\u7528\u55ae\u4e00\u6b04\u4f4d\u4f5c\u70ba\u4e3b\u9375\u3002<\/li>\n<li><strong>\u5b9a\u671f\u6aa2\u67e5\u8cc7\u6599\u5b8c\u6574\u6027\uff1a<\/strong>\u78ba\u4fdd\u8cc7\u6599\u8868\u4e2d\u7684\u4e3b\u9375\u503c\u59cb\u7d42\u4fdd\u6301\u552f\u4e00\u6027\u548c\u975e\u7a7a\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-RkhjuOEYRW\">\u7e3d\u7d50<\/h2>\n<p>\u4e3b\u9375\u5728MySQL\u8cc7\u6599\u5eab\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u78ba\u4fdd\u8cc7\u6599\u7684\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\u3002\u900f\u904e\u6b63\u78ba\u7684\u5b9a\u7fa9\u548c\u4f7f\u7528\u4e3b\u9375\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u548c\u7dad\u8b77\u8cc7\u6599\u5eab\u7684\u8cc7\u6599\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u548c\u7a69\u5b9a\u6027\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u8cc7\u6599\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684PRIMARY KEY\uff08\u4e3b\u9375\uff09\u6307\u4ee4\uff0c\u78ba\u4fdd\u6578\u64da\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u67e5\u8a62\u6548\u7387\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-79410","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79410","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=79410"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79410\/revisions"}],"predecessor-version":[{"id":79411,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79410\/revisions\/79411"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}