{"id":188192,"date":"2024-11-11T20:35:25","date_gmt":"2024-11-11T12:35:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188192\/"},"modified":"2024-11-11T20:35:26","modified_gmt":"2024-11-11T12:35:26","slug":"%e9%9a%a8%e6%a9%9fsql%e5%87%bd%e6%95%b8%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188192\/","title":{"rendered":"\u96a8\u6a5fSQL\u51fd\u6578\u793a\u4f8b"},"content":{"rendered":"

\u96a8\u6a5fSQL\u51fd\u6578\u793a\u4f8b<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u67e5\u8a62\u548c\u64cd\u4f5c\u6578\u64da\u3002\u96a8\u6a5f\u6578\u64da\u7684\u751f\u6210\u5728\u8a31\u591a\u61c9\u7528\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u91cd\u8981\uff0c\u4f8b\u5982\u6e2c\u8a66\u3001\u6a21\u64ec\u548c\u6578\u64da\u5206\u6790\u7b49\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u5e38\u7528\u7684\u96a8\u6a5fSQL\u51fd\u6578\u793a\u4f8b\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728SQL\u4e2d\u751f\u6210\u96a8\u6a5f\u6578\u64da\u3002<\/p>\n

1. \u96a8\u6a5f\u6578\u751f\u6210\u51fd\u6578<\/h2>\n

\u5728SQL\u4e2d\uff0c\u751f\u6210\u96a8\u6a5f\u6578\u7684\u51fd\u6578\u901a\u5e38\u662f RAND()<\/code> \u6216 RANDOM()<\/code>\u3002\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u751f\u6210\u4ecb\u65bc0\u548c1\u4e4b\u9593\u7684\u96a8\u6a5f\u6d6e\u9ede\u6578\u3002<\/p>\n

SELECT RAND() AS random_number;\n<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u4e00\u500b\u96a8\u6a5f\u751f\u6210\u7684\u6d6e\u9ede\u6578\u3002\u4f8b\u5982\uff0c\u53ef\u80fd\u7684\u8f38\u51fa\u70ba 0.123456<\/code>\u3002<\/p>\n
2. \u96a8\u6a5f\u6574\u6578\u751f\u6210<\/h2>\n
\u5982\u679c\u9700\u8981\u751f\u6210\u7279\u5b9a\u7bc4\u570d\u5167\u7684\u96a8\u6a5f\u6574\u6578\uff0c\u53ef\u4ee5\u4f7f\u7528 FLOOR()<\/code> \u51fd\u6578\u7d50\u5408 RAND()<\/code> \u51fd\u6578\u4f86\u5be6\u73fe\u3002<\/p>\n
SELECT FLOOR(RAND() * 100) AS random_integer;\n<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u751f\u6210\u4e00\u500b\u4ecb\u65bc0\u523099\u4e4b\u9593\u7684\u96a8\u6a5f\u6574\u6578\u3002\u901a\u904e\u8abf\u6574\u4e58\u6578\uff0c\u53ef\u4ee5\u6539\u8b8a\u751f\u6210\u6574\u6578\u7684\u7bc4\u570d\u3002<\/p>\n
3. \u96a8\u6a5f\u9078\u64c7\u6578\u64da\u884c<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u5e0c\u671b\u5f9e\u6578\u64da\u8868\u4e2d\u96a8\u6a5f\u9078\u64c7\u4e00\u884c\u6578\u64da\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4f7f\u7528 ORDER BY RAND()<\/code> \u4f86\u5be6\u73fe\u3002<\/p>\n
SELECT * FROM your_table\nORDER BY RAND()\nLIMIT 1;\n<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u5f9e your_table<\/code> \u8868\u4e2d\u96a8\u6a5f\u9078\u64c7\u4e00\u884c\u6578\u64da\u3002\u8acb\u6ce8\u610f\uff0c\u9019\u7a2e\u65b9\u6cd5\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u56e0\u70ba\u5b83\u9700\u8981\u5c0d\u6574\u500b\u8868\u9032\u884c\u6392\u5e8f\u3002<\/p>\n
4. \u96a8\u6a5f\u5b57\u7b26\u4e32\u751f\u6210<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u751f\u6210\u96a8\u6a5f\u5b57\u7b26\u4e32\uff0c\u4f8b\u5982\u7528\u65bc\u6e2c\u8a66\u7684\u96a8\u6a5f\u5bc6\u78bc\u3002\u53ef\u4ee5\u4f7f\u7528 SUBSTRING()<\/code> \u548c CHAR()<\/code> \u51fd\u6578\u4f86\u751f\u6210\u96a8\u6a5f\u5b57\u7b26\u4e32\u3002<\/p>\n
SELECT SUBSTRING(MD5(RAND()), 1, 10) AS random_string;\n<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u751f\u6210\u4e00\u500b\u96a8\u6a5f\u768410\u500b\u5b57\u7b26\u9577\u7684\u5b57\u7b26\u4e32\u3002\u9019\u662f\u901a\u904e\u751f\u6210\u4e00\u500b\u96a8\u6a5f\u7684MD5\u54c8\u5e0c\u503c\u4e26\u63d0\u53d6\u5176\u524d10\u500b\u5b57\u7b26\u4f86\u5be6\u73fe\u7684\u3002<\/p>\n
5. \u96a8\u6a5f\u65e5\u671f\u751f\u6210<\/h2>\n
\u751f\u6210\u96a8\u6a5f\u65e5\u671f\u5728\u67d0\u4e9b\u61c9\u7528\u4e2d\u4e5f\u975e\u5e38\u6709\u7528\u3002\u53ef\u4ee5\u4f7f\u7528 DATE_ADD()<\/code> \u51fd\u6578\u4f86\u751f\u6210\u96a8\u6a5f\u65e5\u671f\u3002<\/p>\n
SELECT DATE_ADD('2023-01-01', INTERVAL FLOOR(RAND() * 365) DAY) AS random_date;\n<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u751f\u6210\u4e00\u500b\u4ecb\u65bc2023\u5e741\u67081\u65e5\u52302023\u5e7412\u670831\u65e5\u4e4b\u9593\u7684\u96a8\u6a5f\u65e5\u671f\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u96a8\u6a5fSQL\u51fd\u6578\u5728\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u5177\u6709\u91cd\u8981\u7684\u61c9\u7528\u50f9\u503c\uff0c\u7121\u8ad6\u662f\u751f\u6210\u6e2c\u8a66\u6578\u64da\u9084\u662f\u9032\u884c\u6578\u64da\u5206\u6790\u3002\u901a\u904e\u4f7f\u7528 RAND()<\/code>\u3001FLOOR()<\/code>\u3001ORDER BY RAND()<\/code> \u7b49\u51fd\u6578\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u5730\u751f\u6210\u96a8\u6a5f\u6578\u64da\u3002\u9019\u4e9b\u6280\u8853\u5728\u958b\u767c\u548c\u6e2c\u8a66\u904e\u7a0b\u4e2d\u90fd\u80fd\u63d0\u4f9b\u6975\u5927\u7684\u4fbf\u5229\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc \u9999\u6e2fVPS<\/a> \u670d\u52d9\u6709\u8208\u8da3\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9748\u6d3b\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f\u9700\u8981\u9ad8\u6027\u80fd\u7684 \u4f3a\u670d\u5668<\/a> \u9084\u662f\u7a69\u5b9a\u7684 \u96f2\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u96a8\u6a5fSQL\u51fd\u6578\u793a\u4f8b\uff0c\u5b78\u7fd2\u5982\u4f55\u5728\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u751f\u6210\u96a8\u6a5f\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u8207\u6e2c\u8a66\u7684\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-188192","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188192","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=188192"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188192\/revisions"}],"predecessor-version":[{"id":188193,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188192\/revisions\/188193"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}