{"id":187562,"date":"2024-11-11T15:18:19","date_gmt":"2024-11-11T07:18:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187562\/"},"modified":"2024-11-11T15:18:20","modified_gmt":"2024-11-11T07:18:20","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96%ef%bc%9a%e8%a7%a3%e6%b1%ba%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%b5%90%e6%a7%8b%e5%95%8f%e9%a1%8c-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%95%b8%e6%93%9a%e9%87%8d","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187562\/","title":{"rendered":"\u6578\u64da\u5eab\u512a\u5316\uff1a\u89e3\u6c7a\u91cd\u8907\u6578\u64da\u7d50\u69cb\u554f\u984c (\u6578\u64da\u5eab\u6578\u64da\u91cd\u8907\u6578\u64da\u7d50\u69cb)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96%ef%bc%9a%e8%a7%a3%e6%b1%ba%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%b5%90%e6%a7%8b%e5%95%8f%e9%a1%8c-FQbxDVQfYx\">\u6578\u64da\u5eab\u512a\u5316\uff1a\u89e3\u6c7a\u91cd\u8907\u6578\u64da\u7d50\u69cb\u554f\u984c<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6548\u7387\u5c0d\u65bc\u4f01\u696d\u7684\u6210\u529f\u81f3\u95dc\u91cd\u8981\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u6578\u64da\u5eab\u4e2d\u91cd\u8907\u6578\u64da\u7684\u554f\u984c\u65e5\u76ca\u7a81\u51fa\uff0c\u9019\u4e0d\u50c5\u5f71\u97ff\u4e86\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u6027\u80fd\u7684\u4e0b\u964d\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u5982\u4f55\u512a\u5316\u6578\u64da\u5eab\u4ee5\u89e3\u6c7a\u91cd\u8907\u6578\u64da\u7d50\u69cb\u554f\u984c\u662f\u6bcf\u4f4d\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u548c\u958b\u767c\u8005\u5fc5\u9808\u638c\u63e1\u7684\u6280\u80fd\u3002<\/p>\n<h2 id=\"%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e5%ae%9a%e7%be%a9%e8%88%87%e5%bd%b1%e9%9f%bf-FQbxDVQfYx\">\u91cd\u8907\u6578\u64da\u7684\u5b9a\u7fa9\u8207\u5f71\u97ff<\/h2>\n<p>\u91cd\u8907\u6578\u64da\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\u5b58\u5728\u591a\u500b\u76f8\u540c\u6216\u76f8\u4f3c\u7684\u6578\u64da\u689d\u76ee\u3002\u9019\u7a2e\u60c5\u6cc1\u901a\u5e38\u767c\u751f\u5728\u6578\u64da\u8f38\u5165\u4e0d\u7576\u3001\u6578\u64da\u6574\u5408\u904e\u7a0b\u4e2d\u6216\u7f3a\u4e4f\u9069\u7576\u7684\u6578\u64da\u7ba1\u7406\u7b56\u7565\u6642\u3002\u91cd\u8907\u6578\u64da\u7684\u5b58\u5728\u6703\u5c0e\u81f4\u4ee5\u4e0b\u5e7e\u500b\u554f\u984c\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u5197\u9918\uff1a<\/strong>\u91cd\u8907\u6578\u64da\u6703\u4f54\u7528\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\uff0c\u589e\u52a0\u6578\u64da\u5eab\u7684\u5927\u5c0f\u3002<\/li>\n<li><strong>\u67e5\u8a62\u6027\u80fd\u4e0b\u964d\uff1a<\/strong>\u67e5\u8a62\u91cd\u8907\u6578\u64da\u9700\u8981\u66f4\u591a\u7684\u8a08\u7b97\u8cc7\u6e90\uff0c\u5f9e\u800c\u5f71\u97ff\u6574\u9ad4\u6027\u80fd\u3002<\/li>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\u554f\u984c\uff1a<\/strong>\u7576\u6578\u64da\u66f4\u65b0\u6642\uff0c\u91cd\u8907\u6578\u64da\u53ef\u80fd\u5c0e\u81f4\u4e0d\u540c\u7248\u672c\u7684\u6578\u64da\u5b58\u5728\uff0c\u9020\u6210\u6578\u64da\u4e0d\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%ad%98%e5%88%a5%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e6%96%b9%e6%b3%95-FQbxDVQfYx\">\u8b58\u5225\u91cd\u8907\u6578\u64da\u7684\u65b9\u6cd5<\/h2>\n<p>\u5728\u89e3\u6c7a\u91cd\u8907\u6578\u64da\u554f\u984c\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u8b58\u5225\u51fa\u91cd\u8907\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u7528\u7684\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528SQL\u67e5\u8a62\uff1a<\/strong>\u53ef\u4ee5\u901a\u904eSQL\u67e5\u8a62\u4f86\u8b58\u5225\u91cd\u8907\u6578\u64da\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u53ef\u4ee5\u627e\u51fa\u5728\u67d0\u500b\u8868\u4e2d\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff1a<\/li>\n<pre><code>SELECT email, COUNT(*) \nFROM users \nGROUP BY email \nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<li><strong>\u6578\u64da\u5206\u6790\u5de5\u5177\uff1a<\/strong>\u4f7f\u7528\u6578\u64da\u5206\u6790\u5de5\u5177\uff08\u5982Python\u7684Pandas\u5eab\uff09\u4f86\u6aa2\u67e5\u6578\u64da\u96c6\u4e2d\u7684\u91cd\u8907\u689d\u76ee\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e7%ad%96%e7%95%a5-FQbxDVQfYx\">\u89e3\u6c7a\u91cd\u8907\u6578\u64da\u7684\u7b56\u7565<\/h2>\n<p>\u4e00\u65e6\u8b58\u5225\u51fa\u91cd\u8907\u6578\u64da\uff0c\u63a5\u4e0b\u4f86\u7684\u6b65\u9a5f\u662f\u63a1\u53d6\u63aa\u65bd\u4f86\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u6709\u6548\u7684\u7b56\u7565\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u6e05\u7406\uff1a<\/strong>\u5b9a\u671f\u9032\u884c\u6578\u64da\u6e05\u7406\uff0c\u522a\u9664\u4e0d\u5fc5\u8981\u7684\u91cd\u8907\u6578\u64da\u3002\u9019\u53ef\u4ee5\u901a\u904e\u7de8\u5beb\u81ea\u52d5\u5316\u8173\u672c\u4f86\u5be6\u73fe\u3002<\/li>\n<li><strong>\u6578\u64da\u6b63\u898f\u5316\uff1a<\/strong>\u901a\u904e\u6b63\u898f\u5316\u6578\u64da\u5eab\u7d50\u69cb\u4f86\u6e1b\u5c11\u5197\u9918\u3002\u4f8b\u5982\uff0c\u5c07\u91cd\u8907\u7684\u6578\u64da\u79fb\u5230\u7368\u7acb\u7684\u8868\u4e2d\uff0c\u4e26\u4f7f\u7528\u5916\u9375\u4f86\u5efa\u7acb\u95dc\u806f\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\u5c07\u4f86\u63d2\u5165\u91cd\u8907\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u96fb\u5b50\u90f5\u4ef6\u5b57\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/li>\n<pre><code>ALTER TABLE users \nADD CONSTRAINT unique_email \nUNIQUE (email);<\/code><\/pre>\n<\/ul>\n<h2 id=\"%e6%8c%81%e7%ba%8c%e7%9b%a3%e6%8e%a7%e8%88%87%e7%b6%ad%e8%ad%b7-FQbxDVQfYx\">\u6301\u7e8c\u76e3\u63a7\u8207\u7dad\u8b77<\/h2>\n<p>\u89e3\u6c7a\u91cd\u8907\u6578\u64da\u554f\u984c\u4e26\u4e0d\u662f\u4e00\u6b21\u6027\u7684\u4efb\u52d9\uff0c\u800c\u662f\u4e00\u500b\u6301\u7e8c\u7684\u904e\u7a0b\u3002\u5b9a\u671f\u76e3\u63a7\u6578\u64da\u5eab\u7684\u5065\u5eb7\u72c0\u6cc1\uff0c\u4e26\u9032\u884c\u5fc5\u8981\u7684\u7dad\u8b77\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62\u91cd\u8907\u6578\u64da\u7684\u518d\u6b21\u51fa\u73fe\u3002\u4f7f\u7528\u6578\u64da\u5eab\u76e3\u63a7\u5de5\u5177\u4f86\u8ddf\u8e2a\u6578\u64da\u7684\u8b8a\u5316\uff0c\u4e26\u53ca\u6642\u767c\u73fe\u6f5b\u5728\u7684\u554f\u984c\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-FQbxDVQfYx\">\u7d50\u8ad6<\/h2>\n<p>\u91cd\u8907\u6578\u64da\u7d50\u69cb\u554f\u984c\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u6311\u6230\u3002\u901a\u904e\u8b58\u5225\u3001\u6e05\u7406\u548c\u9810\u9632\u91cd\u8907\u6578\u64da\uff0c\u4f01\u696d\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u63d0\u5347\u7528\u6236\u9ad4\u9a57\uff0c\u9084\u80fd\u4fc3\u9032\u696d\u52d9\u7684\u9577\u671f\u767c\u5c55\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u548c\u6578\u64da\u5eab\u512a\u5316\u7684\u8cc7\u8a0a\uff0c\u5c07\u6709\u52a9\u65bc\u60a8\u5728\u6578\u64da\u7ba1\u7406\u4e0a\u53d6\u5f97\u66f4\u5927\u7684\u6210\u529f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u6578\u64da\u5eab\u512a\u5316\u6280\u8853\uff0c\u89e3\u6c7a\u91cd\u8907\u6578\u64da\u7d50\u69cb\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u8207\u6e96\u78ba\u6027\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-187562","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187562","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=187562"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187562\/revisions"}],"predecessor-version":[{"id":187563,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187562\/revisions\/187563"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=187562"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=187562"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=187562"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}