{"id":177141,"date":"2024-11-08T13:41:16","date_gmt":"2024-11-08T05:41:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/177141\/"},"modified":"2024-11-08T13:41:17","modified_gmt":"2024-11-08T05:41:17","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41060-sql%e7%8b%80%e6%85%8b%ef%bc%9a42s21%ef%bc%88er_dup_fieldname%ef%bc%89%e9%87%8d%e8%a4%87%e7%9a%84%e5%88%97%e5%90%8d%ef%bc%85s","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/177141\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41060 &#8211; SQL\u72c0\u614b\uff1a42S21\uff08ER_DUP_FIELDNAME\uff09\u91cd\u8907\u7684\u5217\u540d\u201c\uff05s\u201d"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41060-sql%e7%8b%80%e6%85%8b%ef%bc%9a42s21%ef%bc%88er_dup_fieldname%ef%bc%89%e9%87%8d%e8%a4%87%e7%9a%84%e5%88%97%e5%90%8d%ef%bc%85s-uFwxYWwnVO\">\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41060 &#8211; SQL\u72c0\u614b\uff1a42S21\uff08ER_DUP_FIELDNAME\uff09\u91cd\u8907\u7684\u5217\u540d\u201c\uff05s\u201d<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u4fbf\u662f\u932f\u8aa41060\uff0c\u8a72\u932f\u8aa4\u7684SQL\u72c0\u614b\u70ba42S21\uff0c\u8868\u793a\u51fa\u73fe\u4e86\u91cd\u8907\u7684\u5217\u540d\u3002\u9019\u7a2e\u60c5\u6cc1\u901a\u5e38\u767c\u751f\u5728\u5275\u5efa\u6216\u4fee\u6539\u8868\u683c\u6642\uff0c\u7576\u4f60\u5617\u8a66\u6dfb\u52a0\u4e00\u500b\u5df2\u7d93\u5b58\u5728\u7684\u5217\u540d\u6642\uff0cMySQL\u6703\u8fd4\u56de\u6b64\u932f\u8aa4\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u8a72\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e5%8e%9f%e5%9b%a0-uFwxYWwnVO\">\u932f\u8aa4\u539f\u56e0<\/h2>\n<p>MySQL\u932f\u8aa41060\u7684\u4e3b\u8981\u539f\u56e0\u662fSQL\u8a9e\u53e5\u4e2d\u5305\u542b\u4e86\u91cd\u8907\u7684\u5217\u540d\u3002\u9019\u53ef\u80fd\u767c\u751f\u5728\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\u4e2d\uff1a<\/p>\n<ul>\n<li><strong>\u5275\u5efa\u8868\u683c\u6642\uff1a<\/strong>\u7576\u4f60\u4f7f\u7528CREATE TABLE\u8a9e\u53e5\u5275\u5efa\u4e00\u500b\u65b0\u8868\u683c\uff0c\u4e26\u4e14\u5728\u5217\u5b9a\u7fa9\u4e2d\u91cd\u8907\u4e86\u67d0\u500b\u5217\u540d\u3002<\/li>\n<li><strong>\u4fee\u6539\u8868\u683c\u6642\uff1a<\/strong>\u7576\u4f60\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u6dfb\u52a0\u65b0\u5217\u6642\uff0c\u5982\u679c\u65b0\u5217\u7684\u540d\u7a31\u8207\u73fe\u6709\u5217\u7684\u540d\u7a31\u76f8\u540c\uff0c\u5247\u6703\u5f15\u767c\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>\u5408\u4f75\u67e5\u8a62\u6642\uff1a<\/strong>\u5728\u4f7f\u7528JOIN\u8a9e\u53e5\u6642\uff0c\u5982\u679c\u5169\u500b\u8868\u4e2d\u6709\u76f8\u540c\u7684\u5217\u540d\u800c\u672a\u4f7f\u7528\u5225\u540d\uff0c\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u6b64\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e9%8c%af%e8%aa%a41060-uFwxYWwnVO\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa41060<\/h2>\n<p>\u4fee\u5fa9MySQL\u932f\u8aa41060\u7684\u95dc\u9375\u5728\u65bc\u6aa2\u67e5SQL\u8a9e\u53e5\u4e26\u78ba\u4fdd\u6240\u6709\u5217\u540d\u90fd\u662f\u552f\u4e00\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5177\u9ad4\u7684\u89e3\u6c7a\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5create-table%e8%aa%9e%e5%8f%a5-uFwxYWwnVO\">1. \u6aa2\u67e5CREATE TABLE\u8a9e\u53e5<\/h3>\n<pre><code>CREATE TABLE example (\n    id INT PRIMARY KEY,\n    name VARCHAR(100),\n    name VARCHAR(100)  -- \u9019\u88e1\u6703\u5f15\u767c\u932f\u8aa41060\n);<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u5217\u540d\u201cname\u201d\u88ab\u91cd\u8907\u5b9a\u7fa9\u3002\u8981\u4fee\u5fa9\u6b64\u932f\u8aa4\uff0c\u53ea\u9700\u522a\u9664\u91cd\u8907\u7684\u5217\u540d\u6216\u66f4\u6539\u5176\u540d\u7a31\uff1a<\/p>\n<pre><code>CREATE TABLE example (\n    id INT PRIMARY KEY,\n    name VARCHAR(100),\n    description VARCHAR(100)  -- \u4fee\u6539\u70ba\u4e0d\u540c\u7684\u5217\u540d\n);<\/code><\/pre>\n<h3 id=\"2-%e6%aa%a2%e6%9f%a5alter-table%e8%aa%9e%e5%8f%a5-uFwxYWwnVO\">2. \u6aa2\u67e5ALTER TABLE\u8a9e\u53e5<\/h3>\n<pre><code>ALTER TABLE example ADD COLUMN name VARCHAR(100);  -- \u5982\u679c\u201cname\u201d\u5df2\u5b58\u5728\uff0c\u5247\u6703\u5f15\u767c\u932f\u8aa4\n<\/code><\/pre>\n<p>\u5728\u57f7\u884cALTER TABLE\u8a9e\u53e5\u4e4b\u524d\uff0c\u61c9\u5148\u6aa2\u67e5\u8a72\u5217\u662f\u5426\u5df2\u5b58\u5728\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u6aa2\u67e5\uff1a<\/p>\n<pre><code>SHOW COLUMNS FROM example;<\/code><\/pre>\n<p>\u5982\u679c\u201cname\u201d\u5df2\u5b58\u5728\uff0c\u5247\u61c9\u9078\u64c7\u4e0d\u540c\u7684\u5217\u540d\u4f86\u6dfb\u52a0\u65b0\u5217\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e5%88%a5%e5%90%8d%e8%a7%a3%e6%b1%bajoin%e5%95%8f%e9%a1%8c-uFwxYWwnVO\">3. \u4f7f\u7528\u5225\u540d\u89e3\u6c7aJOIN\u554f\u984c<\/h3>\n<p>\u5728\u9032\u884cJOIN\u64cd\u4f5c\u6642\uff0c\u82e5\u5169\u500b\u8868\u4e2d\u6709\u76f8\u540c\u7684\u5217\u540d\uff0c\u61c9\u4f7f\u7528\u5225\u540d\u4f86\u907f\u514d\u885d\u7a81\uff1a<\/p>\n<pre><code>SELECT a.id, a.name AS a_name, b.name AS b_name\nFROM table_a a\nJOIN table_b b ON a.id = b.id;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-uFwxYWwnVO\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u932f\u8aa41060\uff08\u91cd\u8907\u7684\u5217\u540d\uff09\u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u901a\u5e38\u53ef\u4ee5\u901a\u904e\u4ed4\u7d30\u6aa2\u67e5SQL\u8a9e\u53e5\u4f86\u8f15\u9b06\u89e3\u6c7a\u3002\u78ba\u4fdd\u5728\u5275\u5efa\u6216\u4fee\u6539\u8868\u683c\u6642\uff0c\u6240\u6709\u5217\u540d\u90fd\u662f\u552f\u4e00\u7684\uff0c\u4e26\u5728\u9032\u884cJOIN\u64cd\u4f5c\u6642\u4f7f\u7528\u5225\u540d\u4f86\u907f\u514d\u885d\u7a81\u3002\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u6b64\u932f\u8aa4\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u9806\u5229\u9032\u884c\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u66f4\u591a\u6709\u95dc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u652f\u6301\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\uff0c\u4e86\u89e3\u66f4\u591a\u6709\u95dc\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u670d\u52d9\u548c\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4fee\u5fa9MySQL\u932f\u8aa41060\uff08ER_DUP_FIELDNAME\uff09\u7684\u65b9\u6cd5\uff0c\u89e3\u6c7a\u91cd\u8907\u5217\u540d\u554f\u984c\uff0c\u78ba\u4fddSQL\u67e5\u8a62\u6b63\u78ba\u57f7\u884c\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-177141","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177141","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=177141"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177141\/revisions"}],"predecessor-version":[{"id":177142,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177141\/revisions\/177142"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=177141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=177141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=177141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}