{"id":6352,"date":"2024-07-18T19:54:39","date_gmt":"2024-07-18T11:54:39","guid":{"rendered":"https:\/\/t.n-years.com\/?p=6352"},"modified":"2024-07-18T19:56:26","modified_gmt":"2024-07-18T11:56:26","slug":"%e6%95%b0%e6%8d%ae%e5%ba%93%e8%a1%a8%e7%b4%a2%e5%bc%95%e7%9a%84%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/t.n-years.com\/?p=6352","title":{"rendered":"\u6570\u636e\u5e93\u8868\u7d22\u5f15\u7684\u539f\u7406"},"content":{"rendered":"<p>\u6570\u636e\u5e93\u8868\u7d22\u5f15\u7684\u539f\u7406\u662f\u901a\u8fc7\u5728\u8868\u7684\u67d0\u4e9b\u5217\u4e0a\u521b\u5efa\u989d\u5916\u7684\u6570\u636e\u7ed3\u6784\u6765\u52a0\u5feb\u6570\u636e\u68c0\u7d22\u7684\u901f\u5ea6\u3002\u7d22\u5f15\u7684\u6838\u5fc3\u601d\u60f3\u662f\u51cf\u5c11\u9700\u8981\u626b\u63cf\u7684\u884c\u6570\uff0c\u4ece\u800c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u7684\u7d22\u5f15\u539f\u7406\u548c\u5e38\u89c1\u7684\u7d22\u5f15\u7c7b\u578b\uff1a<\/p>\n<h3>\u7d22\u5f15\u7684\u57fa\u672c\u539f\u7406<\/h3>\n<p>\u7d22\u5f15\u7c7b\u4f3c\u4e8e\u4e66\u7684\u76ee\u5f55\uff0c\u901a\u8fc7\u76ee\u5f55\u53ef\u4ee5\u5feb\u901f\u5b9a\u4f4d\u5230\u76ee\u6807\u7ae0\u8282\uff0c\u800c\u4e0d\u9700\u8981\u4ece\u5934\u5230\u5c3e\u9605\u8bfb\u6574\u672c\u4e66\u3002\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u7d22\u5f15\u662f\u57fa\u4e8e\u67d0\u5217\uff08\u6216\u591a\u5217\uff09\u521b\u5efa\u7684\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u4f7f\u5f97\u6570\u636e\u5e93\u53ef\u4ee5\u5feb\u901f\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6570\u636e\u884c\uff0c\u800c\u4e0d\u5fc5\u626b\u63cf\u6574\u4e2a\u8868\u3002<\/p>\n<h3>\u5e38\u89c1\u7684\u7d22\u5f15\u7ed3\u6784<\/h3>\n<ol>\n<li>\n<p><strong>B-\u6811\uff08B-Tree\uff09\u548c 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<code>IN<\/code>\uff09\uff0c\u4f46\u4e0d\u9002\u7528\u4e8e\u8303\u56f4\u67e5\u8be2\u6216\u6392\u5e8f\u67e5\u8be2\u3002<\/li>\n<\/ul>\n<p><strong>\u4f18\u70b9<\/strong>\uff1a<\/p>\n<ul>\n<li>\u7b49\u503c\u67e5\u8be2\u6548\u7387\u9ad8\u3002<\/li>\n<\/ul>\n<p><strong>\u7f3a\u70b9<\/strong>\uff1a<\/p>\n<ul>\n<li>\u4e0d\u652f\u6301\u8303\u56f4\u67e5\u8be2\u3002<\/li>\n<li>\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u53ef\u80fd\u5bfc\u81f4\u54c8\u5e0c\u51b2\u7a81\uff0c\u5f71\u54cd\u6027\u80fd\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u5168\u6587\u7d22\u5f15<\/strong><\/p>\n<ul>\n<li>\u5168\u6587\u7d22\u5f15\u7528\u4e8e\u5bf9\u5927\u6587\u672c\u5b57\u6bb5\u8fdb\u884c\u5168\u6587\u641c\u7d22\uff0c\u57fa\u4e8e\u5012\u6392\u7d22\u5f15\u5b9e\u73b0\u3002<\/li>\n<li>\u9002\u7528\u4e8e\u641c\u7d22\u5305\u542b\u7279\u5b9a\u5173\u952e\u5b57\u7684\u6587\u672c\uff0c\u4f8b\u5982\u641c\u7d22\u5f15\u64ce\u4e2d\u7684\u5173\u952e\u8bcd\u641c\u7d22\u3002<\/li>\n<\/ul>\n<p><strong>\u4f18\u70b9<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5bf9\u6587\u672c\u641c\u7d22\u6027\u80fd\u9ad8\u3002<\/li>\n<\/ul>\n<p><strong>\u7f3a\u70b9<\/strong>\uff1a<\/p>\n<ul>\n<li>\u7d22\u5f15\u521b\u5efa\u548c\u7ef4\u62a4\u5f00\u9500\u5927\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u7a7a\u95f4\u7d22\u5f15<\/strong><\/p>\n<ul>\n<li>\u7a7a\u95f4\u7d22\u5f15\uff08\u5982 R-Tree\uff09\u7528\u4e8e\u5730\u7406\u7a7a\u95f4\u6570\u636e\u7684\u5b58\u50a8\u548c\u67e5\u8be2\u3002<\/li>\n<li>\u9002\u7528\u4e8e\u5b58\u50a8\u548c\u67e5\u8be2\u4e8c\u7ef4\u3001\u4e09\u7ef4\u7a7a\u95f4\u6570\u636e\uff0c\u5982\u5730\u7406\u4f4d\u7f6e\u5750\u6807\u3002<\/li>\n<\/ul>\n<p><strong>\u4f18\u70b9<\/strong>\uff1a<\/p>\n<ul>\n<li>\u9ad8\u6548\u7684\u7a7a\u95f4\u6570\u636e\u67e5\u8be2\u3002<\/li>\n<\/ul>\n<p><strong>\u7f3a\u70b9<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5b9e\u73b0\u548c\u7ef4\u62a4\u590d\u6742\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3>\u7d22\u5f15\u7684\u4f5c\u7528<\/h3>\n<ol>\n<li><strong>\u52a0\u901f\u6570\u636e\u68c0\u7d22<\/strong>\uff1a\u7d22\u5f15\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u6570\u636e\u5e93\u9700\u8981\u626b\u63cf\u7684\u884c\u6570\uff0c\u4ece\u800c\u52a0\u5feb\u6570\u636e\u68c0\u7d22\u901f\u5ea6\u3002<\/li>\n<li><strong>\u786e\u4fdd\u6570\u636e\u552f\u4e00\u6027<\/strong>\uff1a\u552f\u4e00\u7d22\u5f15\uff08UNIQUE INDEX\uff09\u53ef\u4ee5\u4fdd\u8bc1\u4e00\u5217\u6216\u591a\u5217\u7684\u503c\u5728\u8868\u4e2d\u552f\u4e00\u3002<\/li>\n<li><strong>\u4f18\u5316\u6392\u5e8f\u548c\u5206\u7ec4\u64cd\u4f5c<\/strong>\uff1a\u901a\u8fc7\u7d22\u5f15\uff0c\u6570\u636e\u5e93\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u8fdb\u884c\u6392\u5e8f\uff08ORDER BY\uff09\u548c\u5206\u7ec4\uff08GROUP BY\uff09\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u52a0\u901f\u8fde\u63a5\u64cd\u4f5c<\/strong>\uff1a\u5728\u591a\u8868\u8fde\u63a5\uff08JOIN\uff09\u64cd\u4f5c\u4e2d\uff0c\u7d22\u5f15\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u8fde\u63a5\u6027\u80fd\u3002<\/li>\n<\/ol>\n<h3>\u7d22\u5f15\u7684\u521b\u5efa\u4e0e\u4f7f\u7528<\/h3>\n<ul>\n<li>\n<p><strong>\u521b\u5efa\u7d22\u5f15<\/strong>\uff1a\u53ef\u4ee5\u5728\u8868\u7684\u521b\u5efa\u65f6\u6216\u4e4b\u540e\u6dfb\u52a0\u7d22\u5f15\u3002\u5e38\u7528\u7684 SQL \u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"language-sql\">-- \u521b\u5efa\u8868\u65f6\u6dfb\u52a0\u7d22\u5f15\nCREATE TABLE example (\n    id INT PRIMARY KEY,\n    name VARCHAR(100),\n    age INT,\n    INDEX (name)\n);\n\n-- \u5728\u73b0\u6709\u8868\u4e0a\u6dfb\u52a0\u7d22\u5f15\nCREATE INDEX index_name ON example (name);<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u4f7f\u7528\u7d22\u5f15<\/strong>\uff1a\u6570\u636e\u5e93\u67e5\u8be2\u4f18\u5316\u5668\u4f1a\u81ea\u52a8\u9009\u62e9\u6700\u4f18\u7684\u7d22\u5f15\u6765\u6267\u884c\u67e5\u8be2\uff0c\u901a\u5e38\u65e0\u9700\u624b\u52a8\u6307\u5b9a\u4f7f\u7528\u54ea\u4e2a\u7d22\u5f15\u3002\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>FORCE INDEX<\/code> 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fa-angle-double-right\"><\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[123],"tags":[126,108],"class_list":["post-6352","post","type-post","status-publish","format-standard","hentry","category-123","tag-mysql","tag-108"],"_links":{"self":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6352","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6352"}],"version-history":[{"count":1,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6352\/revisions"}],"predecessor-version":[{"id":6353,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6352\/revisions\/6353"}],"wp:attachment":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6352"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6352"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6352"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}