{"id":76790,"date":"2024-10-16T09:57:17","date_gmt":"2024-10-16T01:57:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76790\/"},"modified":"2024-10-16T09:57:17","modified_gmt":"2024-10-16T01:57:17","slug":"mysql%e7%b4%a2%e5%bc%95%e8%a9%b3%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76790\/","title":{"rendered":"MySQL\u7d22\u5f15\u8a73\u89e3"},"content":{"rendered":"<h1 id=\"mysql%e7%b4%a2%e5%bc%95%e8%a9%b3%e8%a7%a3-qmmmZXqRpA\">MySQL\u7d22\u5f15\u8a73\u89e3<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u6578\u64da\u7d50\u69cb\uff0c\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u8cc7\u6599\u5eab\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u8b93\u958b\u767c\u8005\u80fd\u5920\u6839\u64da\u4e0d\u540c\u7684\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u7d22\u5f15\u7684\u57fa\u672c\u6982\u5ff5\u3001\u985e\u578b\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%b4%a2%e5%bc%95%ef%bc%9f-qmmmZXqRpA\">\u4ec0\u9ebc\u662f\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u65e8\u5728\u52a0\u901f\u8cc7\u6599\u5eab\u67e5\u8a62\u7684\u901f\u5ea6\u3002\u5b83\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u80fd\u5920\u5e6b\u52a9\u8cc7\u6599\u5eab\u5feb\u901f\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\u3002\u7576\u8cc7\u6599\u8868\u4e2d\u7684\u6578\u64da\u91cf\u589e\u5927\u6642\uff0c\u6c92\u6709\u7d22\u5f15\u7684\u67e5\u8a62\u53ef\u80fd\u6703\u8b8a\u5f97\u975e\u5e38\u7de9\u6162\uff0c\u56e0\u6b64\u5408\u7406\u4f7f\u7528\u7d22\u5f15\u662f\u512a\u5316\u8cc7\u6599\u5eab\u6027\u80fd\u7684\u95dc\u9375\u3002<\/p>\n<h2 id=\"mysql%e4%b8%ad%e7%9a%84%e7%b4%a2%e5%bc%95%e9%a1%9e%e5%9e%8b-qmmmZXqRpA\">MySQL\u4e2d\u7684\u7d22\u5f15\u985e\u578b<\/h2>\n<p>MySQL\u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u6bcf\u7a2e\u7d22\u5f15\u90fd\u6709\u5176\u7279\u5b9a\u7684\u7528\u9014\u548c\u512a\u7f3a\u9ede\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u898b\u7684\u7d22\u5f15\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u4e3b\u9375\u7d22\u5f15\uff08Primary Key Index\uff09<\/strong>: \u6bcf\u500b\u8cc7\u6599\u8868\u53ea\u80fd\u6709\u4e00\u500b\u4e3b\u9375\u7d22\u5f15\uff0c\u4e3b\u9375\u7d22\u5f15\u7684\u503c\u5fc5\u9808\u552f\u4e00\u4e14\u4e0d\u80fd\u70baNULL\u3002\u4e3b\u9375\u7d22\u5f15\u901a\u5e38\u7528\u65bc\u552f\u4e00\u6a19\u8b58\u8cc7\u6599\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u3002<\/li>\n<li><strong>\u552f\u4e00\u7d22\u5f15\uff08Unique Index\uff09<\/strong>: \u552f\u4e00\u7d22\u5f15\u78ba\u4fdd\u7d22\u5f15\u5217\u4e2d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u4f46\u5141\u8a31NULL\u503c\u3002\u9019\u5c0d\u65bc\u9700\u8981\u4fdd\u6301\u6578\u64da\u552f\u4e00\u6027\u7684\u60c5\u6cc1\u975e\u5e38\u6709\u7528\u3002<\/li>\n<li><strong>\u666e\u901a\u7d22\u5f15\uff08Regular Index\uff09<\/strong>: \u666e\u901a\u7d22\u5f15\u4e0d\u5f37\u5236\u552f\u4e00\u6027\uff0c\u4e3b\u8981\u7528\u65bc\u52a0\u901f\u67e5\u8a62\u3002\u5b83\u53ef\u4ee5\u5728\u4efb\u4f55\u5217\u4e0a\u5275\u5efa\uff0c\u4e26\u4e14\u53ef\u4ee5\u6709\u91cd\u8907\u7684\u503c\u3002<\/li>\n<li><strong>\u5168\u6587\u7d22\u5f15\uff08Full-Text Index\uff09<\/strong>: \u4e3b\u8981\u7528\u65bc\u6587\u672c\u641c\u7d22\uff0c\u5141\u8a31\u5728\u5927\u91cf\u6587\u672c\u4e2d\u9032\u884c\u5feb\u901f\u67e5\u8a62\u3002\u9019\u7a2e\u7d22\u5f15\u9069\u5408\u7528\u65bc\u67e5\u8a62\u5305\u542b\u7279\u5b9a\u55ae\u8a5e\u7684\u884c\u3002<\/li>\n<li><strong>\u8907\u5408\u7d22\u5f15\uff08Composite Index\uff09<\/strong>: \u8907\u5408\u7d22\u5f15\u662f\u7531\u591a\u500b\u5217\u7d44\u6210\u7684\u7d22\u5f15\uff0c\u80fd\u5920\u52a0\u901f\u57fa\u65bc\u591a\u500b\u5217\u7684\u67e5\u8a62\u3002\u4f7f\u7528\u8907\u5408\u7d22\u5f15\u6642\uff0c\u67e5\u8a62\u7684\u5217\u9806\u5e8f\u6703\u5f71\u97ff\u7d22\u5f15\u7684\u4f7f\u7528\u6548\u7387\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e7%b4%a2%e5%bc%95-qmmmZXqRpA\">\u5982\u4f55\u5275\u5efa\u7d22\u5f15<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528CREATE INDEX\u8a9e\u53e5\u4f86\u5275\u5efa\u7d22\u5f15\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u4e0d\u540c\u985e\u578b\u7d22\u5f15\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>-- \u5275\u5efa\u4e3b\u9375\u7d22\u5f15\nCREATE TABLE users (\n    id INT NOT NULL AUTO_INCREMENT,\n    username VARCHAR(50) NOT NULL,\n    email VARCHAR(100) NOT NULL,\n    PRIMARY KEY (id)\n);\n\n-- \u5275\u5efa\u552f\u4e00\u7d22\u5f15\nCREATE UNIQUE INDEX idx_email ON users(email);\n\n-- \u5275\u5efa\u666e\u901a\u7d22\u5f15\nCREATE INDEX idx_username ON users(username);\n\n-- \u5275\u5efa\u8907\u5408\u7d22\u5f15\nCREATE INDEX idx_username_email ON users(username, email);\n<\/code><\/pre>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e5%84%aa%e7%bc%ba%e9%bb%9e-qmmmZXqRpA\">\u7d22\u5f15\u7684\u512a\u7f3a\u9ede<\/h2>\n<p>\u96d6\u7136\u7d22\u5f15\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u4e5f\u6709\u5176\u7f3a\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u512a\u9ede<\/strong>:\n<ul>\n<li>\u52a0\u901f\u67e5\u8a62\uff1a\u7d22\u5f15\u80fd\u5920\u5feb\u901f\u5b9a\u4f4d\u5230\u6240\u9700\u6578\u64da\uff0c\u6e1b\u5c11\u67e5\u8a62\u6642\u9593\u3002<\/li>\n<li>\u63d0\u9ad8\u6392\u5e8f\u6027\u80fd\uff1a\u7d22\u5f15\u53ef\u4ee5\u52a0\u901fORDER BY\u548cGROUP BY\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u7f3a\u9ede<\/strong>:\n<ul>\n<li>\u589e\u52a0\u5b58\u5132\u7a7a\u9593\uff1a\u6bcf\u500b\u7d22\u5f15\u90fd\u9700\u8981\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\u3002<\/li>\n<li>\u5f71\u97ff\u5beb\u5165\u6027\u80fd\uff1a\u5728\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u6578\u64da\u6642\uff0c\u7d22\u5f15\u9700\u8981\u88ab\u66f4\u65b0\uff0c\u9019\u6703\u5f71\u97ff\u5beb\u5165\u6027\u80fd\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-qmmmZXqRpA\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7d22\u5f15\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u8cc7\u6599\u5eab\u7684\u67e5\u8a62\u6027\u80fd\u3002\u4e86\u89e3\u4e0d\u540c\u985e\u578b\u7684\u7d22\u5f15\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5728\u8a2d\u8a08\u8cc7\u6599\u5eab\u6642\u505a\u51fa\u66f4\u660e\u667a\u7684\u9078\u64c7\u3002\u5408\u7406\u4f7f\u7528\u7d22\u5f15\uff0c\u4e0d\u50c5\u80fd\u63d0\u5347\u67e5\u8a62\u901f\u5ea6\uff0c\u9084\u80fd\u512a\u5316\u6574\u9ad4\u7cfb\u7d71\u6027\u80fd\u3002\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u8cc7\u6599\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eMySQL\u7d22\u5f15\u7684\u539f\u7406\u3001\u985e\u578b\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\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-76790","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76790","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=76790"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76790\/revisions"}],"predecessor-version":[{"id":76791,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76790\/revisions\/76791"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76790"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}