{"id":61777,"date":"2024-10-13T13:38:17","date_gmt":"2024-10-13T05:38:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/61777\/"},"modified":"2024-10-13T13:38:17","modified_gmt":"2024-10-13T05:38:17","slug":"innodb-b-tree%e7%b4%a2%e5%bc%95%e6%80%8e%e9%ba%bc%e8%a8%88%e7%ae%97where%e6%a2%9d%e4%bb%b6%e7%af%84%e5%9c%8d%e5%85%a7%e6%9c%89%e5%a4%9a%e5%b0%91%e6%a2%9d%e8%a8%98%e9%8c%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/61777\/","title":{"rendered":"InnoDB B-TREE\u7d22\u5f15\u600e\u9ebc\u8a08\u7b97WHERE\u689d\u4ef6\u7bc4\u570d\u5167\u6709\u591a\u5c11\u689d\u8a18\u9304\uff1f"},"content":{"rendered":"

InnoDB B-TREE\u7d22\u5f15\u600e\u9ebc\u8a08\u7b97WHERE\u689d\u4ef6\u7bc4\u570d\u5167\u6709\u591a\u5c11\u689d\u8a18\u9304\uff1f<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u6578\u64da\u7d50\u69cb\uff0c\u7528\u65bc\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002MySQL\u7684InnoDB\u5b58\u5132\u5f15\u64ce\u4f7f\u7528B-TREE\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u8a62\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u8a08\u7b97\u5728WHERE\u689d\u4ef6\u7bc4\u570d\u5167\u7684\u8a18\u9304\u6578\u91cf\uff0c\u4e26\u6df1\u5165\u4e86\u89e3B-TREE\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n

B-TREE\u7d22\u5f15\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

B-TREE\uff08\u5e73\u8861\u6a39\uff09\u662f\u4e00\u7a2e\u81ea\u5e73\u8861\u7684\u6a39\u5f62\u6578\u64da\u7d50\u69cb\uff0c\u80fd\u5920\u4fdd\u6301\u6578\u64da\u6709\u5e8f\u4e26\u652f\u6301\u9ad8\u6548\u7684\u63d2\u5165\u3001\u522a\u9664\u548c\u67e5\u8a62\u64cd\u4f5c\u3002\u5728InnoDB\u4e2d\uff0cB-TREE\u7d22\u5f15\u7684\u6bcf\u500b\u7bc0\u9ede\u53ef\u4ee5\u5305\u542b\u591a\u500b\u9375\u503c\uff0c\u4e26\u4e14\u6bcf\u500b\u9375\u503c\u90fd\u6307\u5411\u76f8\u61c9\u7684\u6578\u64da\u884c\u3002\u9019\u4f7f\u5f97B-TREE\u7d22\u5f15\u5728\u67e5\u8a62\u6642\u80fd\u5920\u5feb\u901f\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\u3002<\/p>\n

\u8a08\u7b97WHERE\u689d\u4ef6\u7bc4\u570d\u5167\u7684\u8a18\u9304\u6578\u91cf<\/h2>\n

\u8981\u8a08\u7b97\u5728\u7279\u5b9aWHERE\u689d\u4ef6\u7bc4\u570d\u5167\u7684\u8a18\u9304\u6578\u91cf\uff0c\u9996\u5148\u9700\u8981\u7406\u89e3B-TREE\u7d22\u5f15\u7684\u7d50\u69cb\u3002\u7576\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u6578\u64da\u5eab\u6703\u5229\u7528\u7d22\u5f15\u4f86\u5feb\u901f\u5b9a\u4f4d\u7b26\u5408\u689d\u4ef6\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u8a08\u7b97\u904e\u7a0b\u7684\u6b65\u9a5f\uff1a<\/p>\n

1. \u78ba\u5b9a\u67e5\u8a62\u689d\u4ef6<\/h3>\n

\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cemployees\u201d\u7684\u8868\uff0c\u4e26\u4e14\u6211\u5011\u60f3\u8981\u67e5\u8a62\u5e74\u9f61\u572830\u523040\u6b72\u4e4b\u9593\u7684\u54e1\u5de5\u6578\u91cf\u3002\u5c0d\u61c9\u7684SQL\u67e5\u8a62\u8a9e\u53e5\u5982\u4e0b\uff1a<\/p>\n

SELECT COUNT(*) FROM employees WHERE age BETWEEN 30 AND 40;<\/code><\/pre>\n
2. \u4f7f\u7528B-TREE\u7d22\u5f15\u67e5\u627e\u7bc4\u570d<\/h3>\n
\u5728\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u6642\uff0c\u6578\u64da\u5eab\u6703\u9996\u5148\u6aa2\u67e5\u201cage\u201d\u5217\u662f\u5426\u6709\u7d22\u5f15\u3002\u5982\u679c\u6709\uff0c\u6578\u64da\u5eab\u5c07\u4f7f\u7528B-TREE\u7d22\u5f15\u4f86\u67e5\u627e\u7b26\u5408\u689d\u4ef6\u7684\u7bc4\u570d\u3002B-TREE\u7d22\u5f15\u7684\u7279\u6027\u4f7f\u5f97\u67e5\u8a62\u53ef\u4ee5\u5728O(log n)\u7684\u6642\u9593\u5167\u627e\u5230\u7bc4\u570d\u7684\u8d77\u59cb\u548c\u7d50\u675f\u4f4d\u7f6e\u3002<\/p>\n
3. \u8a08\u7b97\u7b26\u5408\u689d\u4ef6\u7684\u8a18\u9304\u6578\u91cf<\/h3>\n
\u4e00\u65e6\u627e\u5230\u7bc4\u570d\u7684\u8d77\u59cb\u548c\u7d50\u675f\u4f4d\u7f6e\uff0c\u6578\u64da\u5eab\u5c07\u904d\u6b77\u9019\u4e9b\u4f4d\u7f6e\u4e4b\u9593\u7684\u6240\u6709\u8a18\u9304\uff0c\u4e26\u8a08\u7b97\u7b26\u5408\u689d\u4ef6\u7684\u8a18\u9304\u6578\u91cf\u3002\u9019\u500b\u904e\u7a0b\u901a\u5e38\u662f\u7dda\u6027\u7684\uff0c\u5373O(m)\uff0c\u5176\u4e2dm\u662f\u7b26\u5408\u689d\u4ef6\u7684\u8a18\u9304\u6578\u91cf\u3002<\/p>\n
\u793a\u4f8b\u5206\u6790<\/h2>\n
\u5047\u8a2d\u201cemployees\u201d\u8868\u4e2d\u6709\u4ee5\u4e0b\u6578\u64da\uff1a<\/p>\n
\n+----+-----+\n| id | age |\n+----+-----+\n| 1  | 25  |\n| 2  | 30  |\n| 3  | 35  |\n| 4  | 40  |\n| 5  | 45  |\n+----+-----+\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u7576\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u6642\uff0cB-TREE\u7d22\u5f15\u5c07\u5feb\u901f\u5b9a\u4f4d\u5230\u5e74\u9f61\u70ba30\u548c40\u7684\u8a18\u9304\uff0c\u7136\u5f8c\u8a08\u7b97\u51fa\u7b26\u5408\u689d\u4ef6\u7684\u8a18\u9304\u6578\u91cf\u70ba3\uff08\u5e74\u9f6130\u300135\u548c40\uff09\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u901a\u904e\u4f7f\u7528InnoDB\u7684B-TREE\u7d22\u5f15\uff0c\u6578\u64da\u5eab\u80fd\u5920\u9ad8\u6548\u5730\u8a08\u7b97\u5728\u7279\u5b9aWHERE\u689d\u4ef6\u7bc4\u570d\u5167\u7684\u8a18\u9304\u6578\u91cf\u3002\u9019\u7a2e\u7d22\u5f15\u7d50\u69cb\u4e0d\u50c5\u63d0\u9ad8\u4e86\u67e5\u8a62\u6027\u80fd\uff0c\u9084\u80fd\u5920\u5728\u5927\u6578\u64da\u96c6\u4e0a\u5feb\u901f\u5b9a\u4f4d\u6240\u9700\u7684\u6578\u64da\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u6aa2\u7d22\u7684\u61c9\u7528\u4f86\u8aaa\uff0c\u7406\u89e3B-TREE\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u6027\u80fd\u512a\u5316\u6216\u5176\u4ed6\u6280\u8853\u554f\u984c\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\uff0c\u7279\u5225\u662f\u6211\u5011\u7684VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u80fd\u5920\u70ba\u60a8\u7684\u61c9\u7528\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u8a08\u7b97InnoDB B-TREE\u7d22\u5f15\u4e2d\u7b26\u5408WHERE\u689d\u4ef6\u7bc4\u570d\u7684\u8a18\u9304\u6578\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u8207\u6027\u80fd\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-61777","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61777","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=61777"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61777\/revisions"}],"predecessor-version":[{"id":61778,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61777\/revisions\/61778"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=61777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=61777"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=61777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}