{"id":175083,"date":"2024-11-08T02:33:21","date_gmt":"2024-11-07T18:33:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175083\/"},"modified":"2024-11-08T02:33:21","modified_gmt":"2024-11-07T18:33:21","slug":"%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%bemysql%e9%9a%a8%e6%a9%9f%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e8%88%87mysql%e9%9a%a8%e6%a9%9f%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175083\/","title":{"rendered":"\u5982\u4f55\u5be6\u73feMySQL\u96a8\u6a5f\u67e5\u8a62\u6578\u64da\u8207MySQL\u96a8\u6a5f\u66f4\u65b0\u6578\u64da\uff1f"},"content":{"rendered":"

\u5982\u4f55\u5be6\u73feMySQL\u96a8\u6a5f\u67e5\u8a62\u6578\u64da\u8207MySQL\u96a8\u6a5f\u66f4\u65b0\u6578\u64da\uff1f<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7cfb\u7d71\u3002\u96a8\u6a5f\u67e5\u8a62\u548c\u96a8\u6a5f\u66f4\u65b0\u6578\u64da\u7684\u9700\u6c42\u5728\u8a31\u591a\u61c9\u7528\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u5e38\u898b\uff0c\u4f8b\u5982\u5728\u904a\u6232\u958b\u767c\u3001\u63a8\u85a6\u7cfb\u7d71\u548c\u6578\u64da\u5206\u6790\u4e2d\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728MySQL\u4e2d\u5be6\u73fe\u96a8\u6a5f\u67e5\u8a62\u548c\u96a8\u6a5f\u66f4\u65b0\u6578\u64da\u7684\u6280\u8853\u65b9\u6cd5\u3002<\/p>\n

\u96a8\u6a5f\u67e5\u8a62\u6578\u64da<\/h2>\n

\u96a8\u6a5f\u67e5\u8a62\u6578\u64da\u7684\u4e3b\u8981\u76ee\u7684\u662f\u5f9e\u6578\u64da\u5eab\u4e2d\u96a8\u6a5f\u9078\u64c7\u4e00\u689d\u6216\u591a\u689d\u8a18\u9304\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4f7f\u7528MySQL\u7684\u96a8\u6a5f\u51fd\u6578\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u65b9\u6cd5\uff1a<\/p>\n

\u4f7f\u7528ORDER BY RAND()<\/h3>\n

\u6700\u5e38\u898b\u7684\u96a8\u6a5f\u67e5\u8a62\u65b9\u6cd5\u662f\u4f7f\u7528 ORDER BY RAND()<\/code>\u3002\u9019\u500b\u65b9\u6cd5\u6703\u96a8\u6a5f\u6392\u5217\u67e5\u8a62\u7d50\u679c\uff0c\u7136\u5f8c\u9078\u64c7\u524d\u5e7e\u689d\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n

SELECT * FROM your_table ORDER BY RAND() LIMIT 1;<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u5f9e your_table<\/code> \u4e2d\u96a8\u6a5f\u9078\u64c7\u4e00\u689d\u8a18\u9304\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u9019\u7a2e\u65b9\u6cd5\u5728\u6578\u64da\u91cf\u8f03\u5927\u6642\u6027\u80fd\u8f03\u5dee\uff0c\u56e0\u70ba\u5b83\u9700\u8981\u5c0d\u6574\u500b\u7d50\u679c\u96c6\u9032\u884c\u6392\u5e8f\u3002<\/p>\n
\u4f7f\u7528LIMIT\u548cOFFSET<\/h3>\n
\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528 LIMIT<\/code> \u548c OFFSET<\/code>\u3002\u9996\u5148\uff0c\u60a8\u53ef\u4ee5\u67e5\u8a62\u8868\u4e2d\u7684\u8a18\u9304\u6578\u91cf\uff0c\u7136\u5f8c\u751f\u6210\u4e00\u500b\u96a8\u6a5f\u7684\u504f\u79fb\u91cf\uff0c\u6700\u5f8c\u4f7f\u7528\u8a72\u504f\u79fb\u91cf\u4f86\u7372\u53d6\u96a8\u6a5f\u8a18\u9304\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n
SET @rand_id = FLOOR(1 + RAND() * (SELECT COUNT(*) FROM your_table));\nSELECT * FROM your_table LIMIT 1 OFFSET @rand_id;<\/code><\/pre>\n
\u9019\u7a2e\u65b9\u6cd5\u7684\u6027\u80fd\u76f8\u5c0d\u8f03\u597d\uff0c\u56e0\u70ba\u5b83\u4e0d\u9700\u8981\u5c0d\u6574\u500b\u7d50\u679c\u96c6\u9032\u884c\u6392\u5e8f\u3002<\/p>\n
\u96a8\u6a5f\u66f4\u65b0\u6578\u64da<\/h2>\n
\u96a8\u6a5f\u66f4\u65b0\u6578\u64da\u7684\u9700\u6c42\u901a\u5e38\u51fa\u73fe\u5728\u9700\u8981\u96a8\u6a5f\u4fee\u6539\u67d0\u4e9b\u8a18\u9304\u7684\u60c5\u6cc1\u4e0b\u3002\u9019\u53ef\u4ee5\u901a\u904e\u7d50\u5408\u96a8\u6a5f\u67e5\u8a62\u548c\u66f4\u65b0\u8a9e\u53e5\u4f86\u5be6\u73fe\u3002<\/p>\n
\u96a8\u6a5f\u9078\u64c7\u4e26\u66f4\u65b0\u8a18\u9304<\/h3>\n
\u60a8\u53ef\u4ee5\u4f7f\u7528 ORDER BY RAND()<\/code> \u4f86\u96a8\u6a5f\u9078\u64c7\u4e00\u689d\u8a18\u9304\uff0c\u7136\u5f8c\u9032\u884c\u66f4\u65b0\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n
UPDATE your_table \nSET your_column = 'new_value' \nWHERE id = (SELECT id FROM your_table ORDER BY RAND() LIMIT 1);<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u96a8\u6a5f\u9078\u64c7\u4e00\u689d\u8a18\u9304\u4e26\u5c07 your_column<\/code> \u66f4\u65b0\u70ba 'new_value'<\/code>\u3002<\/p>\n
\u4f7f\u7528JOIN\u9032\u884c\u96a8\u6a5f\u66f4\u65b0<\/h3>\n
\u5982\u679c\u60a8\u9700\u8981\u66f4\u65b0\u591a\u689d\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528JOIN\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n
UPDATE your_table AS t1\nJOIN (SELECT id FROM your_table ORDER BY RAND() LIMIT 5) AS t2\nON t1.id = t2.id\nSET t1.your_column = 'new_value';<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u96a8\u6a5f\u9078\u64c75\u689d\u8a18\u9304\u4e26\u5c07\u5b83\u5011\u7684 your_column<\/code> \u66f4\u65b0\u70ba 'new_value'<\/code>\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728MySQL\u4e2d\u5be6\u73fe\u96a8\u6a5f\u67e5\u8a62\u548c\u96a8\u6a5f\u66f4\u65b0\u6578\u64da\u7684\u65b9\u6cd5\u6709\u591a\u7a2e\uff0c\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u65b9\u5f0f\u81f3\u95dc\u91cd\u8981\u3002\u4f7f\u7528 ORDER BY RAND()<\/code> \u65b9\u6cd5\u7c21\u55ae\u6613\u7528\uff0c\u4f46\u5728\u6578\u64da\u91cf\u5927\u6642\u6027\u80fd\u8f03\u5dee\uff1b\u800c\u4f7f\u7528 LIMIT<\/code> \u548c OFFSET<\/code> \u7684\u65b9\u6cd5\u5247\u80fd\u63d0\u9ad8\u6027\u80fd\u3002\u96a8\u6a5f\u66f4\u65b0\u6578\u64da\u53ef\u4ee5\u901a\u904e\u96a8\u6a5f\u9078\u64c7\u8a18\u9304\u5f8c\u9032\u884c\u66f4\u65b0\u4f86\u5be6\u73fe\uff0c\u9019\u5728\u8a31\u591a\u61c9\u7528\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\u3002<\/p>\n
\u5982\u679c\u60a8\u9700\u8981\u7a69\u5b9a\u7684\u6578\u64da\u5eab\u652f\u6301\uff0c\u8003\u616e\u4f7f\u7528 \u9999\u6e2fVPS<\/a> \u4f86\u642d\u5efa\u60a8\u7684MySQL\u74b0\u5883\uff0c\u78ba\u4fdd\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u548c\u7ba1\u7406\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u5982\u4f55\u5728MySQL\u4e2d\u5be6\u73fe\u96a8\u6a5f\u67e5\u8a62\u548c\u96a8\u6a5f\u66f4\u65b0\u6578\u64da\u7684\u6280\u5de7\u8207\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u64cd\u4f5c\u7684\u9748\u6d3b\u6027\u8207\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-175083","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175083","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=175083"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175083\/revisions"}],"predecessor-version":[{"id":175084,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175083\/revisions\/175084"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=175083"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=175083"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=175083"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}