{"id":172105,"date":"2024-11-07T10:21:47","date_gmt":"2024-11-07T02:21:47","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172105\/"},"modified":"2024-11-07T10:21:47","modified_gmt":"2024-11-07T02:21:47","slug":"%e5%8e%bb%e9%87%8d%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84list%e6%95%b8%e7%b5%84-list%e6%95%b8%e7%b5%84%e6%80%8e%e9%ba%bc%e5%8e%bb%e9%87%8d%e8%a4%87%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172105\/","title":{"rendered":"\u53bb\u91cd\u6578\u64da\u5eab\u4e2d\u7684list\u6578\u7d44 (list\u6578\u7d44\u600e\u9ebc\u53bb\u91cd\u8907\u7684\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e5%8e%bb%e9%87%8d%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84list%e6%95%b8%e7%b5%84-list%e6%95%b8%e7%b5%84%e6%80%8e%e9%ba%bc%e5%8e%bb%e9%87%8d%e8%a4%87%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab-CeQShDVBdD\">\u53bb\u91cd\u6578\u64da\u5eab\u4e2d\u7684list\u6578\u7d44 (list\u6578\u7d44\u600e\u9ebc\u53bb\u91cd\u8907\u7684\u6578\u64da\u5eab)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u7576\u6211\u5011\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u91cd\u8907\u7684\u6578\u64da\u6703\u5c0e\u81f4\u67e5\u8a62\u6548\u7387\u964d\u4f4e\uff0c\u4e26\u53ef\u80fd\u5f71\u97ff\u6578\u64da\u5206\u6790\u7684\u7d50\u679c\u3002\u56e0\u6b64\uff0c\u53bb\u91cd\u662f\u6578\u64da\u8655\u7406\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u6b65\u9a5f\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u53bb\u91cdlist\u6578\u7d44\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e5%8e%bb%e9%87%8d-CeQShDVBdD\">\u70ba\u4ec0\u9ebc\u9700\u8981\u53bb\u91cd<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u91cd\u8907\u7684\u6578\u64da\u53ef\u80fd\u6703\u5c0e\u81f4\u4ee5\u4e0b\u554f\u984c\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u5197\u9918\uff1a<\/strong>\u91cd\u8907\u7684\u6578\u64da\u6703\u4f54\u7528\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\uff0c\u589e\u52a0\u6578\u64da\u5eab\u7684\u8ca0\u64d4\u3002<\/li>\n<li><strong>\u67e5\u8a62\u6548\u7387\u4f4e\u4e0b\uff1a<\/strong>\u7576\u6578\u64da\u4e2d\u5b58\u5728\u91cd\u8907\u9805\u6642\uff0c\u67e5\u8a62\u7684\u6548\u7387\u6703\u53d7\u5230\u5f71\u97ff\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u805a\u5408\u64cd\u4f5c\u6642\u3002<\/li>\n<li><strong>\u6578\u64da\u5206\u6790\u4e0d\u6e96\u78ba\uff1a<\/strong>\u91cd\u8907\u7684\u6578\u64da\u53ef\u80fd\u6703\u5c0e\u81f4\u5206\u6790\u7d50\u679c\u7684\u504f\u5dee\uff0c\u5f71\u97ff\u6c7a\u7b56\u7684\u6e96\u78ba\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%8e%bb%e9%87%8dlist%e6%95%b8%e7%b5%84-CeQShDVBdD\">\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u53bb\u91cdlist\u6578\u7d44<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\u53bb\u91cdlist\u6578\u7d44\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u898b\u7684\u6280\u8853\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8sql%e8%aa%9e%e5%8f%a5%e5%8e%bb%e9%87%8d-CeQShDVBdD\">1. \u4f7f\u7528SQL\u8a9e\u53e5\u53bb\u91cd<\/h3>\n<p>\u5728\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528SQL\u8a9e\u53e5\u4f86\u53bb\u9664\u91cd\u8907\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cusers\u201d\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u67e5\u627e\u552f\u4e00\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff1a<\/p>\n<pre><code>SELECT DISTINCT email FROM users;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u201cusers\u201d\u8868\u4e2d\u6240\u6709\u552f\u4e00\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8python%e9%80%b2%e8%a1%8c%e5%8e%bb%e9%87%8d-CeQShDVBdD\">2. \u4f7f\u7528Python\u9032\u884c\u53bb\u91cd<\/h3>\n<p>\u5982\u679c\u6578\u64da\u5b58\u5132\u5728list\u6578\u7d44\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528Python\u7684\u96c6\u5408\uff08set\uff09\u4f86\u53bb\u91cd\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>emails = [\"test@example.com\", \"test@example.com\", \"user@example.com\"]\nunique_emails = list(set(emails))\nprint(unique_emails)  # \u8f38\u51fa: ['user@example.com', 'test@example.com']<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5c07list\u8f49\u63db\u70baset\uff0c\u7136\u5f8c\u518d\u8f49\u63db\u56delist\uff0c\u5f9e\u800c\u53bb\u9664\u4e86\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%8e%bb%e9%87%8d%e5%8a%9f%e8%83%bd-CeQShDVBdD\">3. \u4f7f\u7528\u6578\u64da\u5eab\u7684\u53bb\u91cd\u529f\u80fd<\/h3>\n<p>\u8a31\u591a\u6578\u64da\u5eab\u7cfb\u7d71\u63d0\u4f9b\u4e86\u5167\u5efa\u7684\u53bb\u91cd\u529f\u80fd\u3002\u4f8b\u5982\uff0c\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u201cGROUP BY\u201d\u8a9e\u53e5\u4f86\u53bb\u91cd\uff1a<\/p>\n<pre><code>SELECT email FROM users GROUP BY email;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u201cusers\u201d\u8868\u4e2d\u6240\u6709\u552f\u4e00\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u4e26\u4e14\u53ef\u4ee5\u8207\u5176\u4ed6\u805a\u5408\u51fd\u6578\u7d50\u5408\u4f7f\u7528\u3002<\/p>\n<h2 id=\"%e5%8e%bb%e9%87%8d%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-CeQShDVBdD\">\u53bb\u91cd\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u9032\u884c\u6578\u64da\u53bb\u91cd\u6642\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li><strong>\u5b9a\u671f\u6aa2\u67e5\u6578\u64da\uff1a<\/strong>\u5b9a\u671f\u6aa2\u67e5\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\uff0c\u53ca\u6642\u767c\u73fe\u4e26\u8655\u7406\u91cd\u8907\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u4f7f\u7528\u552f\u4e00\u7d04\u675f\uff1a<\/strong>\u5728\u6578\u64da\u5eab\u4e2d\u8a2d\u7f6e\u552f\u4e00\u7d04\u675f\uff0c\u4ee5\u9632\u6b62\u672a\u4f86\u63d2\u5165\u91cd\u8907\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u6578\u64da\u6e05\u7406\u5de5\u5177\uff1a<\/strong>\u8003\u616e\u4f7f\u7528\u6578\u64da\u6e05\u7406\u5de5\u5177\u4f86\u81ea\u52d5\u5316\u53bb\u91cd\u904e\u7a0b\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-CeQShDVBdD\">\u7e3d\u7d50<\/h2>\n<p>\u53bb\u91cd\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u80fd\u5920\u63d0\u9ad8\u6578\u64da\u7684\u8cea\u91cf\u548c\u67e5\u8a62\u6548\u7387\u3002\u7121\u8ad6\u662f\u4f7f\u7528SQL\u8a9e\u53e5\u3001Python\u8173\u672c\u9084\u662f\u6578\u64da\u5eab\u7684\u5167\u5efa\u529f\u80fd\uff0c\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u4f86\u53bb\u9664\u91cd\u8907\u6578\u64da\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u901a\u904e\u5b9a\u671f\u6aa2\u67e5\u548c\u8a2d\u7f6e\u552f\u4e00\u7d04\u675f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u7ba1\u7406\u60a8\u7684\u6578\u64da\u5eab\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u61c9\u5c0d\u6578\u64da\u7ba1\u7406\u7684\u6311\u6230\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u53bb\u91cdlist\u6578\u7d44\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\uff0c\u907f\u514d\u91cd\u8907\u6578\u64da\u5f71\u97ff\u67e5\u8a62\u548c\u5206\u6790\u7d50\u679c\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-172105","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172105","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=172105"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172105\/revisions"}],"predecessor-version":[{"id":172106,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172105\/revisions\/172106"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172105"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172105"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}