{"id":96688,"date":"2024-10-20T11:32:19","date_gmt":"2024-10-20T03:32:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96688\/"},"modified":"2024-10-20T11:32:20","modified_gmt":"2024-10-20T03:32:20","slug":"plsql-%e8%99%95%e7%90%86%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%ef%bc%9a%e6%9f%a5%e6%89%be%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-plsql%e4%b8%ad%e6%80%8e%e9%ba%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96688\/","title":{"rendered":"PLSQL \u8655\u7406\u91cd\u8907\u8a18\u9304\uff1a\u67e5\u627e\u6578\u64da\u5eab\u4e2d\u91cd\u8907\u6578\u64da (plsql\u4e2d\u600e\u9ebc\u67e5\u91cd\u8907\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"plsql-%e8%99%95%e7%90%86%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%ef%bc%9a%e6%9f%a5%e6%89%be%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-fHvuBVGJgx\">PLSQL \u8655\u7406\u91cd\u8907\u8a18\u9304\uff1a\u67e5\u627e\u6578\u64da\u5eab\u4e2d\u91cd\u8907\u6578\u64da<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u8a18\u9304\u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\u3002\u9019\u4e9b\u91cd\u8907\u7684\u6578\u64da\u4e0d\u50c5\u6703\u5f71\u97ff\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u6548\u7387\u7684\u4e0b\u964d\u3002PLSQL\uff08Procedural Language\/SQL\uff09\u4f5c\u70baOracle\u6578\u64da\u5eab\u7684\u64f4\u5c55\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u67e5\u627e\u548c\u8655\u7406\u91cd\u8907\u8a18\u9304\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528PLSQL\u67e5\u627e\u6578\u64da\u5eab\u4e2d\u7684\u91cd\u8907\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e5%ae%9a%e7%be%a9-fHvuBVGJgx\">\u91cd\u8907\u8a18\u9304\u7684\u5b9a\u7fa9<\/h2>\n<p>\u91cd\u8907\u8a18\u9304\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\u5b58\u5728\u591a\u689d\u76f8\u540c\u6216\u76f8\u4f3c\u7684\u8a18\u9304\u3002\u9019\u4e9b\u8a18\u9304\u53ef\u80fd\u662f\u7531\u65bc\u6578\u64da\u8f38\u5165\u932f\u8aa4\u3001\u7cfb\u7d71\u6545\u969c\u6216\u6578\u64da\u6574\u5408\u904e\u7a0b\u4e2d\u7684\u554f\u984c\u800c\u7522\u751f\u7684\u3002\u91cd\u8907\u8a18\u9304\u6703\u5c0e\u81f4\u6578\u64da\u5197\u9918\uff0c\u5f71\u97ff\u6578\u64da\u5206\u6790\u7684\u6e96\u78ba\u6027\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e6%89%be%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e6%96%b9%e6%b3%95-fHvuBVGJgx\">\u67e5\u627e\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5<\/h2>\n<p>\u5728PLSQL\u4e2d\uff0c\u67e5\u627e\u91cd\u8907\u8a18\u9304\u901a\u5e38\u4f7f\u7528GROUP BY\u8a9e\u53e5\u7d50\u5408HAVING\u5b50\u53e5\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u67e5\u627e\u91cd\u8907\u8a18\u9304\u7684\u4e00\u822c\u6b65\u9a5f\uff1a<\/p>\n<ol>\n<li>\u9078\u64c7\u9700\u8981\u6aa2\u67e5\u7684\u5217\u3002<\/li>\n<li>\u4f7f\u7528GROUP BY\u8a9e\u53e5\u5c07\u76f8\u540c\u7684\u8a18\u9304\u5206\u7d44\u3002<\/li>\n<li>\u4f7f\u7528HAVING\u5b50\u53e5\u904e\u6ffe\u51fa\u51fa\u73fe\u6b21\u6578\u5927\u65bc1\u7684\u8a18\u9304\u3002<\/li>\n<\/ol>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e6%9f%a5%e6%89%be%e9%87%8d%e8%a4%87%e7%9a%84%e9%9b%bb%e5%ad%90%e9%83%b5%e4%bb%b6%e5%9c%b0%e5%9d%80-fHvuBVGJgx\">\u793a\u4f8b\uff1a\u67e5\u627e\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>users<\/code>\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002\u6211\u5011\u5e0c\u671b\u67e5\u627e\u6240\u6709\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bPLSQL\u67e5\u8a62\uff1a<\/p>\n<pre><code>\nSELECT email, COUNT(*) as count\nFROM users\nGROUP BY email\nHAVING COUNT(*) &gt; 1;\n<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u8fd4\u56de\u6240\u6709\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\u3002<\/p>\n<h3 id=\"%e6%9f%a5%e6%89%be%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e5%ae%8c%e6%95%b4%e7%a4%ba%e4%be%8b-fHvuBVGJgx\">\u67e5\u627e\u91cd\u8907\u8a18\u9304\u7684\u5b8c\u6574\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u66f4\u5b8c\u6574\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u67e5\u627e\u91cd\u8907\u8a18\u9304\u4e26\u5c07\u5176\u5b58\u5132\u5728\u4e00\u500b\u65b0\u8868\u4e2d\uff1a<\/p>\n<pre><code>\nCREATE TABLE duplicate_emails AS\nSELECT email, COUNT(*) as count\nFROM users\nGROUP BY email\nHAVING COUNT(*) &gt; 1;\n<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u5275\u5efa\u4e00\u500b\u540d\u70ba<code>duplicate_emails<\/code>\u7684\u65b0\u8868\uff0c\u4e26\u5c07\u6240\u6709\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u53ca\u5176\u51fa\u73fe\u6b21\u6578\u5b58\u5132\u5728\u5176\u4e2d\u3002<\/p>\n<h2 id=\"%e8%99%95%e7%90%86%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-fHvuBVGJgx\">\u8655\u7406\u91cd\u8907\u8a18\u9304<\/h2>\n<p>\u67e5\u627e\u91cd\u8907\u8a18\u9304\u5f8c\uff0c\u63a5\u4e0b\u4f86\u7684\u6b65\u9a5f\u662f\u5982\u4f55\u8655\u7406\u9019\u4e9b\u91cd\u8907\u7684\u6578\u64da\u3002\u5e38\u898b\u7684\u8655\u7406\u65b9\u6cd5\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u522a\u9664\u91cd\u8907\u8a18\u9304\uff1a<\/strong>\u53ef\u4ee5\u4f7f\u7528DELETE\u8a9e\u53e5\u522a\u9664\u91cd\u8907\u7684\u8a18\u9304\uff0c\u53ea\u4fdd\u7559\u4e00\u689d\u3002<\/li>\n<li><strong>\u5408\u4f75\u6578\u64da\uff1a<\/strong>\u5982\u679c\u91cd\u8907\u8a18\u9304\u4e2d\u6709\u4e0d\u540c\u7684\u4fe1\u606f\uff0c\u53ef\u4ee5\u8003\u616e\u5408\u4f75\u9019\u4e9b\u6578\u64da\u3002<\/li>\n<li><strong>\u6a19\u8a18\u91cd\u8907\u8a18\u9304\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u6a19\u8a18\u91cd\u8907\u8a18\u9304\u4ee5\u4fbf\u5f8c\u7e8c\u8655\u7406\u3002<\/li>\n<\/ul>\n<h3 id=\"%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e7%a4%ba%e4%be%8b-fHvuBVGJgx\">\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u793a\u4f8b\uff0c\u50c5\u4fdd\u7559\u6bcf\u500b\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u7684\u7b2c\u4e00\u689d\u8a18\u9304\uff1a<\/p>\n<pre><code>\nDELETE FROM users\nWHERE rowid NOT IN (\n    SELECT MIN(rowid)\n    FROM users\n    GROUP BY email\n);\n<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u522a\u9664\u6240\u6709\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u53ea\u4fdd\u7559\u6bcf\u500b\u5730\u5740\u7684\u7b2c\u4e00\u689d\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-fHvuBVGJgx\">\u7e3d\u7d50<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u67e5\u627e\u548c\u8655\u7406\u91cd\u8907\u8a18\u9304\u662f\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u7684\u91cd\u8981\u6b65\u9a5f\u3002\u4f7f\u7528PLSQL\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u5730\u67e5\u627e\u91cd\u8907\u6578\u64da\u4e26\u63a1\u53d6\u76f8\u61c9\u7684\u63aa\u65bd\u4f86\u8655\u7406\u5b83\u5011\u3002\u7121\u8ad6\u662f\u522a\u9664\u3001\u5408\u4f75\u9084\u662f\u6a19\u8a18\u91cd\u8907\u8a18\u9304\uff0c\u9019\u4e9b\u64cd\u4f5c\u90fd\u80fd\u5e6b\u52a9\u6211\u5011\u7dad\u8b77\u4e00\u500b\u4e7e\u6de8\u4e14\u9ad8\u6548\u7684\u6578\u64da\u5eab\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5b58\u5132\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u904b\u884c\uff0c\u6211\u5011\u90fd\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728PLSQL\u4e2d\u67e5\u627e\u548c\u8655\u7406\u6578\u64da\u5eab\u4e2d\u7684\u91cd\u8907\u8a18\u9304\uff0c\u63d0\u5347\u6578\u64da\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-96688","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96688","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=96688"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96688\/revisions"}],"predecessor-version":[{"id":96689,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96688\/revisions\/96689"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96688"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96688"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96688"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}