{"id":152155,"date":"2024-11-01T20:34:24","date_gmt":"2024-11-01T12:34:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152155\/"},"modified":"2024-11-01T20:34:25","modified_gmt":"2024-11-01T12:34:25","slug":"%e8%a1%a8%e6%a0%bc%e9%87%8d%e8%a4%87%ef%bc%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e6%89%be%e6%8c%87%e5%8d%97-%e6%80%8e%e9%ba%bc%e6%9f%a5%e6%89%be%e8%a1%a8%e6%a0%bc%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152155\/","title":{"rendered":"\u8868\u683c\u91cd\u8907\uff0c\u6578\u64da\u5eab\u67e5\u627e\u6307\u5357 (\u600e\u9ebc\u67e5\u627e\u8868\u683c\u91cd\u8907\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e8%a1%a8%e6%a0%bc%e9%87%8d%e8%a4%87%ef%bc%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e6%89%be%e6%8c%87%e5%8d%97-%e6%80%8e%e9%ba%bc%e6%9f%a5%e6%89%be%e8%a1%a8%e6%a0%bc%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-IPujaTArsQ\">\u8868\u683c\u91cd\u8907\uff0c\u6578\u64da\u5eab\u67e5\u627e\u6307\u5357 (\u600e\u9ebc\u67e5\u627e\u8868\u683c\u91cd\u8907\u6578\u64da\u5eab)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\u3002\u7121\u8ad6\u662f\u56e0\u70ba\u6578\u64da\u8f38\u5165\u932f\u8aa4\u3001\u7cfb\u7d71\u6574\u5408\u9084\u662f\u5176\u4ed6\u539f\u56e0\uff0c\u91cd\u8907\u7684\u6578\u64da\u90fd\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff0c\u5f71\u97ff\u5831\u544a\u7684\u6e96\u78ba\u6027\u548c\u696d\u52d9\u6c7a\u7b56\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u5982\u4f55\u67e5\u627e\u548c\u8655\u7406\u91cd\u8907\u6578\u64da\u662f\u6bcf\u4f4d\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u5fc5\u5099\u7684\u6280\u80fd\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e6%9f%a5%e6%89%be%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-IPujaTArsQ\">\u70ba\u4ec0\u9ebc\u9700\u8981\u67e5\u627e\u91cd\u8907\u6578\u64da<\/h2>\n<p>\u91cd\u8907\u6578\u64da\u53ef\u80fd\u6703\u5c0e\u81f4\u591a\u7a2e\u554f\u984c\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff1a\u540c\u4e00\u689d\u6578\u64da\u7684\u591a\u500b\u7248\u672c\u53ef\u80fd\u5c0e\u81f4\u6df7\u6dc6\u3002<\/li>\n<li>\u6027\u80fd\u554f\u984c\uff1a\u91cd\u8907\u6578\u64da\u6703\u589e\u52a0\u6578\u64da\u5eab\u7684\u5927\u5c0f\uff0c\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li>\u5831\u544a\u932f\u8aa4\uff1a\u5728\u751f\u6210\u5831\u544a\u6642\uff0c\u91cd\u8907\u6578\u64da\u53ef\u80fd\u6703\u5c0e\u81f4\u932f\u8aa4\u7684\u5206\u6790\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9f%a5%e6%89%be%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%96%b9%e6%b3%95-IPujaTArsQ\">\u67e5\u627e\u91cd\u8907\u6578\u64da\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>\u67e5\u627e\u91cd\u8907\u6578\u64da\u7684\u904e\u7a0b\u901a\u5e38\u6d89\u53ca\u4f7f\u7528 SQL \u67e5\u8a62\u4f86\u8b58\u5225\u91cd\u8907\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8-group-by-%e5%92%8c-having-%e5%ad%90%e5%8f%a5-IPujaTArsQ\">1. \u4f7f\u7528 GROUP BY \u548c HAVING \u5b50\u53e5<\/h3>\n<p>\u9019\u662f\u67e5\u627e\u91cd\u8907\u6578\u64da\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u4e4b\u4e00\u3002\u901a\u904e\u4f7f\u7528 <code>GROUP BY<\/code> \u5b50\u53e5\uff0c\u53ef\u4ee5\u5c07\u6578\u64da\u5206\u7d44\uff0c\u7136\u5f8c\u4f7f\u7528 <code>HAVING<\/code> \u5b50\u53e5\u4f86\u7be9\u9078\u51fa\u91cd\u8907\u7684\u8a18\u9304\u3002<\/p>\n<pre><code>SELECT column_name, COUNT(*)\nFROM table_name\nGROUP BY column_name\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>column_name<\/code> \u662f\u4f60\u60f3\u8981\u6aa2\u67e5\u91cd\u8907\u7684\u5217\u540d\uff0c<code>table_name<\/code> \u662f\u4f60\u7684\u8868\u540d\u3002\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e8%87%aa%e9%80%a3%e6%8e%a5%e6%9f%a5%e8%a9%a2-IPujaTArsQ\">2. \u4f7f\u7528\u81ea\u9023\u63a5\u67e5\u8a62<\/h3>\n<p>\u81ea\u9023\u63a5\u67e5\u8a62\u53ef\u4ee5\u7528\u4f86\u67e5\u627e\u91cd\u8907\u7684\u8a18\u9304\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u6bd4\u8f03\u540c\u4e00\u8868\u4e2d\u7684\u4e0d\u540c\u8a18\u9304\u6642\u3002<\/p>\n<pre><code>SELECT a.*\nFROM table_name a, table_name b\nWHERE a.column_name = b.column_name\nAND a.id &lt;&gt; b.id;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>a<\/code> \u548c <code>b<\/code> \u662f\u540c\u4e00\u8868\u7684\u5169\u500b\u5225\u540d\uff0c\u9019\u6a23\u53ef\u4ee5\u6bd4\u8f03\u540c\u4e00\u8868\u4e2d\u7684\u4e0d\u540c\u8a18\u9304\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e7%aa%97%e5%8f%a3%e5%87%bd%e6%95%b8-IPujaTArsQ\">3. \u4f7f\u7528\u7a97\u53e3\u51fd\u6578<\/h3>\n<p>\u5728\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u7a97\u53e3\u51fd\u6578\u4f86\u67e5\u627e\u91cd\u8907\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u901a\u5e38\u66f4\u9ad8\u6548\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\u3002<\/p>\n<pre><code>SELECT column_name, COUNT(*) OVER (PARTITION BY column_name) AS count\nFROM table_name\nWHERE count &gt; 1;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u91cd\u8907\u8a18\u9304\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\uff0c\u4e26\u4e14\u4e0d\u9700\u8981\u4f7f\u7528 <code>GROUP BY<\/code>\u3002<\/p>\n<h2 id=\"%e8%99%95%e7%90%86%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-IPujaTArsQ\">\u8655\u7406\u91cd\u8907\u6578\u64da<\/h2>\n<p>\u4e00\u65e6\u67e5\u627e\u5230\u4e86\u91cd\u8907\u6578\u64da\uff0c\u63a5\u4e0b\u4f86\u7684\u6b65\u9a5f\u662f\u8655\u7406\u9019\u4e9b\u6578\u64da\u3002\u5e38\u898b\u7684\u8655\u7406\u65b9\u6cd5\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u522a\u9664\u91cd\u8907\u8a18\u9304\uff1a\u6839\u64da\u696d\u52d9\u9700\u6c42\uff0c\u9078\u64c7\u4fdd\u7559\u4e00\u689d\u8a18\u9304\u4e26\u522a\u9664\u5176\u4ed6\u91cd\u8907\u7684\u8a18\u9304\u3002<\/li>\n<li>\u5408\u4f75\u6578\u64da\uff1a\u5982\u679c\u91cd\u8907\u7684\u8a18\u9304\u5305\u542b\u4e0d\u540c\u7684\u4fe1\u606f\uff0c\u53ef\u4ee5\u8003\u616e\u5408\u4f75\u9019\u4e9b\u6578\u64da\u3002<\/li>\n<li>\u6a19\u8a18\u91cd\u8907\uff1a\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u6a19\u8a18\u91cd\u8907\u7684\u8a18\u9304\u4ee5\u4fbf\u5f8c\u7e8c\u8655\u7406\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-IPujaTArsQ\">\u7e3d\u7d50<\/h2>\n<p>\u67e5\u627e\u548c\u8655\u7406\u91cd\u8907\u6578\u64da\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u901a\u904e\u4f7f\u7528 SQL \u67e5\u8a62\u548c\u9069\u7576\u7684\u6578\u64da\u8655\u7406\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u4e2d\u7684\u91cd\u8907\u8a18\u9304\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u67e5\u627e\u548c\u8655\u7406\u8868\u683c\u4e2d\u7684\u91cd\u8907\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6548\u7387\uff0c\u78ba\u4fdd\u6578\u64da\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-152155","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152155","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=152155"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152155\/revisions"}],"predecessor-version":[{"id":152156,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152155\/revisions\/152156"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152155"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152155"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152155"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}