{"id":76190,"date":"2024-10-16T04:36:14","date_gmt":"2024-10-15T20:36:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76190\/"},"modified":"2024-10-16T04:36:15","modified_gmt":"2024-10-15T20:36:15","slug":"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8alter-table-table-drop-column-column%e5%be%9e%e8%a1%a8%e4%b8%ad%e7%a7%bb%e9%99%a4%e4%b8%80%e5%88%97%e3%80%82","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76190\/","title":{"rendered":"MySQL\u5165\u9580\uff1a\u4f7f\u7528ALTER TABLE [table] DROP COLUMN column\u5f9e\u8868\u4e2d\u79fb\u9664\u4e00\u5217\u3002"},"content":{"rendered":"<h1 id=\"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8alter-table-table-drop-column-column%e5%be%9e%e8%a1%a8%e4%b8%ad%e7%a7%bb%e9%99%a4%e4%b8%80%e5%88%97-qfZXSxccLp\">MySQL\u5165\u9580\uff1a\u4f7f\u7528ALTER TABLE [table] DROP COLUMN column\u5f9e\u8868\u4e2d\u79fb\u9664\u4e00\u5217<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u96a8\u8457\u6578\u64da\u7684\u589e\u9577\u548c\u9700\u6c42\u7684\u8b8a\u5316\uff0c\u6578\u64da\u5eab\u7d50\u69cb\u53ef\u80fd\u9700\u8981\u8abf\u6574\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528MySQL\u7684ALTER TABLE\u8a9e\u53e5\u4f86\u5f9e\u8868\u4e2d\u79fb\u9664\u4e00\u5217\uff0c\u5177\u9ad4\u4f7f\u7528DROP COLUMN\u5b50\u53e5\u3002<\/p>\n<h2 id=\"alter-table%e8%aa%9e%e5%8f%a5%e6%a6%82%e8%bf%b0-qfZXSxccLp\">ALTER TABLE\u8a9e\u53e5\u6982\u8ff0<\/h2>\n<p>ALTER TABLE\u8a9e\u53e5\u662f\u7528\u4f86\u4fee\u6539\u5df2\u5b58\u5728\u7684\u6578\u64da\u8868\u7d50\u69cb\u7684\u547d\u4ee4\u3002\u9019\u500b\u547d\u4ee4\u53ef\u4ee5\u7528\u4f86\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u8868\u4e2d\u7684\u5217\u3002\u7576\u6211\u5011\u9700\u8981\u522a\u9664\u4e00\u5217\u6642\uff0c\u4f7f\u7528DROP COLUMN\u5b50\u53e5\u662f\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8drop-column%e5%88%aa%e9%99%a4%e5%88%97-qfZXSxccLp\">\u4f7f\u7528DROP COLUMN\u522a\u9664\u5217<\/h2>\n<p>\u8981\u5f9e\u8868\u4e2d\u79fb\u9664\u4e00\u5217\uff0c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ALTER TABLE [table_name] DROP COLUMN [column_name];<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>[table_name]<\/code>\u662f\u4f60\u8981\u4fee\u6539\u7684\u8868\u7684\u540d\u7a31\uff0c\u800c<code>[column_name]<\/code>\u662f\u4f60\u60f3\u8981\u522a\u9664\u7684\u5217\u7684\u540d\u7a31\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-qfZXSxccLp\">\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>employees<\/code>\u7684\u8868\uff0c\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE employees (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    name VARCHAR(100),\n    age INT,\n    department VARCHAR(50)\n);<\/code><\/pre>\n<p>\u5982\u679c\u6211\u5011\u6c7a\u5b9a\u4e0d\u518d\u9700\u8981<code>age<\/code>\u9019\u4e00\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u522a\u9664\u5b83\uff1a<\/p>\n<pre><code>ALTER TABLE employees DROP COLUMN age;<\/code><\/pre>\n<p>\u57f7\u884c\u9019\u500b\u547d\u4ee4\u5f8c\uff0c<code>employees<\/code>\u8868\u7684\u7d50\u69cb\u5c07\u8b8a\u70ba\uff1a<\/p>\n<pre><code>CREATE TABLE employees (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    name VARCHAR(100),\n    department VARCHAR(50)\n);<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-qfZXSxccLp\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u4e1f\u5931\uff1a<\/strong>\u522a\u9664\u5217\u6703\u5c0e\u81f4\u8a72\u5217\u4e2d\u7684\u6240\u6709\u6578\u64da\u6c38\u4e45\u4e1f\u5931\uff0c\u56e0\u6b64\u5728\u57f7\u884c\u6b64\u64cd\u4f5c\u4e4b\u524d\uff0c\u5efa\u8b70\u5099\u4efd\u6578\u64da\u3002<\/li>\n<li><strong>\u5916\u9375\u7d04\u675f\uff1a<\/strong>\u5982\u679c\u8981\u522a\u9664\u7684\u5217\u662f\u5916\u9375\u7684\u4e00\u90e8\u5206\uff0c\u5247\u5fc5\u9808\u5148\u522a\u9664\u5916\u9375\u7d04\u675f\u3002<\/li>\n<li><strong>\u6027\u80fd\u5f71\u97ff\uff1a<\/strong>\u5728\u5927\u578b\u8868\u4e0a\u57f7\u884cALTER TABLE\u64cd\u4f5c\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u4f4e\u5cf0\u6642\u6bb5\u9032\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-qfZXSxccLp\">\u7d50\u8ad6<\/h2>\n<p>\u4f7f\u7528MySQL\u7684ALTER TABLE\u8a9e\u53e5\u4e2d\u7684DROP COLUMN\u5b50\u53e5\u53ef\u4ee5\u65b9\u4fbf\u5730\u5f9e\u8868\u4e2d\u79fb\u9664\u4e0d\u518d\u9700\u8981\u7684\u5217\u3002\u9019\u4e00\u904e\u7a0b\u96d6\u7136\u7c21\u55ae\uff0c\u4f46\u5728\u57f7\u884c\u4e4b\u524d\u5fc5\u9808\u8b39\u614e\u8003\u616e\u6578\u64da\u4e1f\u5931\u548c\u6027\u80fd\u5f71\u97ff\u7b49\u56e0\u7d20\u3002\u4e86\u89e3\u5982\u4f55\u6b63\u78ba\u4f7f\u7528\u9019\u4e9b\u547d\u4ee4\u5c07\u6709\u52a9\u65bc\u66f4\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u7d50\u69cb\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u7121\u8ad6\u662f\u5c0b\u627e<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u9084\u662f\u5176\u4ed6<code><a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a><\/code>\u89e3\u6c7a\u65b9\u6848\uff0cServer.HK\u90fd\u80fd\u63d0\u4f9b\u76f8\u61c9\u7684\u652f\u6301\u548c\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to remove a column from a MySQL table using the ALTER TABLE [table] DROP COLUMN column command in this beginner-friendly guide.<\/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-76190","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76190","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=76190"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76190\/revisions"}],"predecessor-version":[{"id":76191,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76190\/revisions\/76191"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76190"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76190"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76190"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}