{"id":6102,"date":"2024-06-20T15:31:29","date_gmt":"2024-06-20T07:31:29","guid":{"rendered":"http:\/\/www.killtest.hk\/?p=6102"},"modified":"2024-06-20T15:31:29","modified_gmt":"2024-06-20T07:31:29","slug":"%e5%a6%82%e4%bd%95%e9%a9%97%e8%ad%89%e5%90%84%e5%b9%b3%e5%8f%b0618%e9%8a%b7%e5%94%ae%e9%87%8f%e6%98%af%e5%90%a6%e9%80%a0%e5%81%87%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.killtest.hk\/index.php\/killtest\/%e5%a6%82%e4%bd%95%e9%a9%97%e8%ad%89%e5%90%84%e5%b9%b3%e5%8f%b0618%e9%8a%b7%e5%94%ae%e9%87%8f%e6%98%af%e5%90%a6%e9%80%a0%e5%81%87%ef%bc%9f\/","title":{"rendered":"\u5982\u4f55\u9a57\u8b49\u5404\u5e73\u53f0618\u92b7\u552e\u91cf\u662f\u5426\u9020\u5047\uff1f"},"content":{"rendered":"

\u99ac\u807d MySQL\u8cc7\u6599\u5eab\u806f\u76df
\n\u5f88\u591a\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u6703\u8a8d\u70ba\u5728\u4e00\u5806\u6578\u64da\u4e2d\uff0c\u4ee5 1 \u70ba\u9996\u4f4d\u7684\u6578\u5b57\u51fa\u73fe\u7684\u6a5f\u7387\u70ba 1\/9\u3002<\/p>\n

\u4f46\u662f\uff0c\u5be6\u969b\u60c5\u6cc1\u537b\u6709\u4e9b\u5dee\u7570\uff0c\u9019\u5c31\u662f\u56e0\u70ba\u6709\u672c\u798f\u7279\u5b9a\u5f8b\u3002<\/p>\n

\u672c\u798f\u7279\u5b9a\u5f8b\uff0c\u4e5f\u7a31\u70ba\u672c\u798f\u7279\u6cd5\u5247\uff0c\u5728\u4e00\u5806\u5f9e\u5be6\u969b\u751f\u6d3b\u5f97\u51fa\u7684\u6578\u64da\u4e2d\uff0c\u4ee51 \u70ba\u9996\u4f4d\u7684\u6578\u5b57\u51fa\u73fe\u6a5f\u7387\u7d04\u70ba\u7e3d\u6578\u76843 \u6210\uff0c\u63a5\u8fd1\u76f4\u89ba\u5f97\u51fa\u7684\u671f\u671b\u503c1\/9 \u76843 \u500d\u3002<\/p>\n

\u901a\u4fd7\u5f97\u8aaa\uff0c\u5c31\u662f\u8d8a\u5927\u7684\u6578\uff0c\u4ee5\u5b83\u70ba\u9996\u7684\u6578\u51fa\u73fe\u7684\u6a5f\u7387\u5c31\u8d8a\u4f4e\u3002<\/p>\n

\u5728 b \u9032\u4f4d\u5236\u4e2d\uff0c\u4ee5 n \u70ba\u9996\u4f4d\u7684\u6578\u5b57\u51fa\u73fe\u7684\u6a5f\u7387\u70ba logb(n + 1) \u2212 logb(n)\u3002<\/p>\n

\u4e0b\u8868\u5c31\u662f\u5728\u5341\u9032\u5236\u9996\u4f4d\u6578\u5b57\u7684\u51fa\u73fe\u6a5f\u7387\uff08\u5176\u4e2d d \u70ba\u9996\u4f4d\u7684\u6578\u5b57\uff0cp \u70ba\u51fa\u73fe\u7684\u6a5f\u7387\uff09\uff1a
\n\"\"<\/a>
\n\u90a3\u9ebc\u5be6\u969b\u5de5\u4f5c\u751f\u6d3b\u4e2d\uff0c\u54ea\u4e9b\u6578\u64da\u771f\u7684\u7b26\u5408\u672c\u798f\u7279\u5b9a\u5f8b\u5462\uff1f<\/p>\n

\u5834\u666f\u4e00\uff1aMySQL<\/a>\u7684\u8868\u683c\u8cc7\u6599\u91cf<\/p>\n

\u4f8b\u5982MySQL\u7684\u8868\u683c\u8cc7\u6599\u91cf\uff0c\u5982\u679c\u8868\u683c\u5920\u591a\uff0c\u90a3\u4e5f\u662f\u6eff\u8db3\u672c\u798f\u7279\u5b9a\u5f8b\u7684\u3002<\/p>\n

\u6211\u5011\u53ef\u4ee5\u5617\u8a66\u8b93\u67d0\u6b3eAI\u5de5\u5177\u7522\u751fSQL\u8a9e\u53e5\uff0c\u4f86\u5224\u65b7\u8868\u683c\u8cc7\u6599\u91cf\u662f\u5426\u6eff\u8db3\u9019\u500b\u5b9a\u5f8b\u3002<\/p>\n

\u63d0\u793a\u8a5e\uff1a<\/p>\n

\u900f\u904e\u4e00\u500bSQL\u8a9e\u53e5\uff0c\u5224\u65b7MySQL\u8868\u8cc7\u6599\u91cf\u662f\u5426\u6eff\u8db3\u672c\u798f\u7279\u5b9a\u5f8b\uff0c\u67e5\u8a62\u7684\u662finformation_schema.tables\uff0cTABLE_ROWS\u662f\u6bcf\u5f35\u8868\u7684\u884c\u6578\uff0c\u589e\u52a0\u986f\u793a\u6a5f\u7387\u3002<\/p>\n

\u7522\u751f\u7684SQL\u8a9e\u53e5\u5982\u4e0b\uff1a<\/p>\n

SELECT
\n LEFT(CAST(TABLE_ROWS AS CHAR), 1) AS first_digit,
\n COUNT(*) AS frequency,
\n CONCAT(ROUND((COUNT(*) \/ (SELECT COUNT(*) FROM information_schema.tables WHERE TABLE_TYPE = ‘BASE TABLE’ AND TABLE_ROWS > 9) * 100), 2), ‘%’) AS probability
\nFROM
\n information_schema.tables
\nWHERE
\n TABLE_TYPE = ‘BASE TABLE’ AND TABLE_ROWS > 9 — \u5ffd\u7565\u884c\u6570\u5c0f\u4e8e10\u7684\u8868
\nGROUP BY
\n first_digit
\nORDER BY
\n first_digit;
\n\u6211\u81ea\u5df1\u6e2c\u8a66\uff0c\u767c\u73fe\u5e7e\u500b\u5be6\u4f8b\u57fa\u672c\u4e0a\u6eff\u8db3\u672c\u798f\u7279\u5b9a\u5f8b\uff0c\u53ea\u662f\u6a5f\u7387\u7a0d\u5fae\u6709\u9ede\u504f\u5dee\uff0c\u5927\u5bb6\u4e5f\u53ef\u4ee5\u8a66\u8a66\u770b\u3002<\/p>\n

\u5834\u666f\u4e8c\uff1a\u8ca1\u52d9\u6578\u64da<\/p>\n

2001\u5e74\uff0c\u7f8e\u570b\u6700\u5927\u80fd\u6e90\u4ea4\u6613\u5546\u5b89\u7136\u516c\u53f8\u7a81\u7136\u5ba3\u5e03\u7834\u7522\uff0c\u540c\u6642\u50b3\u51fa\u53ef\u80fd\u6709\u8ca1\u52d9\u9020\u5047\u7684\u6d88\u606f\u3002<\/p>\n

\u70ba\u4e86\u9a57\u8b49\u9019\u500b\u50b3\u805e\uff0c\u6709\u4eba\u4f7f\u7528\u4e86\u672c\u798f\u7279\u5b9a\u5f8b\u4f86\u5206\u6790\u5b89\u7136\u516c\u53f8\u516c\u4f48\u7684\u8ca1\u52d9\u5831\u8868\u3002<\/p>\n

\u6bd4\u8f03\u7d50\u679c\u986f\u793a\uff0c\u5728\u5de6\u5074\u7684\u5716\u8868\u4e2d\uff0c\u8ca1\u52d9\u6578\u64da\u8207\u672c\u798f\u7279\u5b9a\u5f8b\u9ad8\u5ea6\u543b\u5408\u3002<\/p>\n

\u7136\u800c\uff0c\u89c0\u5bdf\u53f3\u5074\u7684\u5716\u8868\uff0c\u53ef\u4ee5\u767c\u73fe\u5b89\u7136\u516c\u53f8\u57282000-2001\u5e74\u7684\u8ca1\u52d9\u6578\u64da\u8207\u672c\u798f\u7279\u5b9a\u5f8b\u6709\u986f\u8457\u7684\u504f\u5dee\u3002
\n\"\"<\/a>
\n\u7279\u5225\u662f\u6578\u5b571\u30018\u30019\u7684\u51fa\u73fe\u983b\u7387\u9060\u9ad8\u65bc\u672c\u798f\u7279\u5b9a\u5f8b\u7684\u9810\u6e2c\uff0c\u800c\u6578\u5b572\u30013\u30014\u30015\u30017\u7684\u51fa\u73fe\u983b\u7387\u53c8\u660e\u986f\u4f4e\u65bc\u9810\u671f\u3002<\/p>\n

\u9019\u9805\u767c\u73fe\u70ba\u5b89\u7136\u516c\u53f8\u53ef\u80fd\u6709\u8ca1\u52d9\u9020\u5047\u884c\u70ba\u63d0\u4f9b\u4e86\u6709\u529b\u7684\u8b49\u64da\u3002<\/p>\n

\u5834\u666f\u4e09\uff1a\u5546\u54c1\u92b7\u91cf<\/p>\n

\u5982\u679c\u670b\u53cb\u89ba\u5f97\u67d0\u4e9b\u7db2\u7ad9\u7684\u92b7\u552e\u6578\u64da\u9020\u5047\uff0c\u5c31\u53ef\u4ee5\u8a66\u8a66\uff0c\u7d71\u8a08\u5404\u7a2e\u5546\u54c1\u7684\u92b7\u552e\u91cf\uff0c\u770b\u662f\u5426\u7b26\u5408\u672c\u798f\u7279\u5b9a\u5f8b\u3002<\/p>\n

\u7576\u7136\uff0c\u4eba\u751f\u4e2d\uff0c\u4e00\u5b9a\u9084\u6709\u5f88\u591a\u5834\u666f\u6eff\u8db3\u672c\u798f\u7279\u5b9a\u5f8b\uff0c\u9019\u88e1\u5c31\u4e0d\u4e00\u4e00\u7d30\u8b1b\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u99ac\u807d MySQL\u8cc7\u6599\u5eab\u806f\u76df \u5f88\u591a\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u6703\u8a8d\u70ba\u5728\u4e00\u5806\u6578\u64da\u4e2d\uff0c\u4ee5 1 \u70ba\u9996\u4f4d\u7684\u6578\u5b57\u51fa\u73fe\u7684\u6a5f\u7387\u70ba 1\/9\u3002 \u4f46 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6102","post","type-post","status-publish","format-standard","hentry","category-killtest"],"_links":{"self":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/posts\/6102","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/comments?post=6102"}],"version-history":[{"count":2,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/posts\/6102\/revisions"}],"predecessor-version":[{"id":6106,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/posts\/6102\/revisions\/6106"}],"wp:attachment":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/media?parent=6102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/categories?post=6102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/tags?post=6102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}