{"id":162877,"date":"2024-11-04T18:46:21","date_gmt":"2024-11-04T10:46:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162877\/"},"modified":"2024-11-04T18:46:21","modified_gmt":"2024-11-04T10:46:21","slug":"%e6%95%99%e6%82%a8mysql-alter%e8%aa%9e%e5%8f%a5%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162877\/","title":{"rendered":"\u6559\u60a8MySQL alter\u8a9e\u53e5\u7684\u4f7f\u7528\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"%e6%95%99%e6%82%a8mysql-alter%e8%aa%9e%e5%8f%a5%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95-ajsxzwXpFB\">\u6559\u60a8MySQL alter\u8a9e\u53e5\u7684\u4f7f\u7528\u65b9\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u975e\u5e38\u6d41\u884c\u7684\u9078\u64c7\uff0c\u56e0\u70ba\u5b83\u7684\u9748\u6d3b\u6027\u548c\u5f37\u5927\u7684\u529f\u80fd\u3002\u7576\u6211\u5011\u9700\u8981\u5c0d\u5df2\u5b58\u5728\u7684\u6578\u64da\u8868\u9032\u884c\u4fee\u6539\u6642\uff0c<code>ALTER<\/code> \u8a9e\u53e5\u4fbf\u662f\u6211\u5011\u7684\u597d\u5e6b\u624b\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e <code>ALTER<\/code> \u8a9e\u53e5\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u60a8\u7684\u6578\u64da\u5eab\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afalter%e8%aa%9e%e5%8f%a5%ef%bc%9f-ajsxzwXpFB\">\u4ec0\u9ebc\u662fALTER\u8a9e\u53e5\uff1f<\/h2>\n<p><code>ALTER<\/code> \u8a9e\u53e5\u662f\u7528\u4f86\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u5df2\u5b58\u5728\u7684\u8868\u7d50\u69cb\u7684SQL\u8a9e\u53e5\u3002\u901a\u904e\u9019\u500b\u8a9e\u53e5\uff0c\u60a8\u53ef\u4ee5\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u8868\u4e2d\u7684\u5217\uff0c\u751a\u81f3\u53ef\u4ee5\u6539\u8b8a\u8868\u7684\u540d\u7a31\u6216\u6578\u64da\u985e\u578b\u3002<\/p>\n<h2 id=\"alter%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-ajsxzwXpFB\">ALTER\u8a9e\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u4ee5\u4e0b\u662f <code>ALTER<\/code> \u8a9e\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    [ADD | DROP | MODIFY] column_name column_definition;\n<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>table_name<\/code> \u662f\u60a8\u8981\u4fee\u6539\u7684\u8868\u7684\u540d\u7a31\uff0c<code>column_name<\/code> \u662f\u60a8\u8981\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u7684\u5217\u540d\uff0c\u800c <code>column_definition<\/code> \u5247\u662f\u8a72\u5217\u7684\u65b0\u5b9a\u7fa9\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8alter%e8%aa%9e%e5%8f%a5%e7%9a%84%e7%a4%ba%e4%be%8b-ajsxzwXpFB\">\u4f7f\u7528ALTER\u8a9e\u53e5\u7684\u793a\u4f8b<\/h2>\n<h3 id=\"1-%e6%b7%bb%e5%8a%a0%e6%96%b0%e5%88%97-ajsxzwXpFB\">1. \u6dfb\u52a0\u65b0\u5217<\/h3>\n<p>\u5982\u679c\u60a8\u60f3\u8981\u5728\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\u4e2d\u6dfb\u52a0\u4e00\u500b\u540d\u70ba <code>birthdate<\/code> \u7684\u65b0\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE employees\nADD birthdate DATE;\n<\/code><\/pre>\n<h3 id=\"2-%e5%88%aa%e9%99%a4%e5%88%97-ajsxzwXpFB\">2. \u522a\u9664\u5217<\/h3>\n<p>\u5982\u679c\u60a8\u9700\u8981\u522a\u9664 <code>birthdate<\/code> \u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE employees\nDROP COLUMN birthdate;\n<\/code><\/pre>\n<h3 id=\"3-%e4%bf%ae%e6%94%b9%e5%88%97%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-ajsxzwXpFB\">3. \u4fee\u6539\u5217\u7684\u6578\u64da\u985e\u578b<\/h3>\n<p>\u5047\u8a2d\u60a8\u60f3\u8981\u5c07 <code>salary<\/code> \u5217\u7684\u6578\u64da\u985e\u578b\u5f9e <code>INT<\/code> \u4fee\u6539\u70ba <code>DECIMAL(10,2)<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE employees\nMODIFY salary DECIMAL(10,2);\n<\/code><\/pre>\n<h3 id=\"4-%e9%87%8d%e5%91%bd%e5%90%8d%e5%88%97-ajsxzwXpFB\">4. \u91cd\u547d\u540d\u5217<\/h3>\n<p>\u5982\u679c\u60a8\u9700\u8981\u5c07 <code>salary<\/code> \u5217\u91cd\u547d\u540d\u70ba <code>monthly_salary<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE employees\nCHANGE salary monthly_salary DECIMAL(10,2);\n<\/code><\/pre>\n<h3 id=\"5-%e9%87%8d%e5%91%bd%e5%90%8d%e6%95%b4%e5%80%8b%e8%a1%a8-ajsxzwXpFB\">5. \u91cd\u547d\u540d\u6574\u500b\u8868<\/h3>\n<p>\u5982\u679c\u60a8\u60f3\u8981\u5c07\u8868 <code>employees<\/code> \u91cd\u547d\u540d\u70ba <code>staff<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE employees\nRENAME TO staff;\n<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-ajsxzwXpFB\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5728\u57f7\u884c <code>ALTER<\/code> \u8a9e\u53e5\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<li>\u67d0\u4e9b\u64cd\u4f5c\u53ef\u80fd\u6703\u9396\u5b9a\u8868\uff0c\u5f71\u97ff\u5176\u4ed6\u7528\u6236\u7684\u8a2a\u554f\uff0c\u56e0\u6b64\u5728\u9ad8\u6d41\u91cf\u6642\u6bb5\u9032\u884c\u4fee\u6539\u6642\u9700\u8b39\u614e\u3002<\/li>\n<li>\u4e0d\u540c\u7248\u672c\u7684MySQL\u53ef\u80fd\u5c0d <code>ALTER<\/code> \u8a9e\u53e5\u7684\u652f\u6301\u6709\u6240\u4e0d\u540c\uff0c\u8acb\u53c3\u8003\u5b98\u65b9\u6587\u6a94\u4ee5\u7372\u53d6\u6700\u65b0\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ajsxzwXpFB\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684 <code>ALTER<\/code> \u8a9e\u53e5\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u9748\u6d3b\u5730\u7ba1\u7406\u6578\u64da\u5eab\u7d50\u69cb\u3002\u7121\u8ad6\u662f\u6dfb\u52a0\u3001\u522a\u9664\u9084\u662f\u4fee\u6539\u5217\uff0c\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u90fd\u80fd\u63d0\u9ad8\u6578\u64da\u5eab\u7ba1\u7406\u7684\u6548\u7387\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\u4f86\u904b\u884c\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528MySQL\u7684ALTER\u8a9e\u53e5\uff0c\u8f15\u9b06\u4fee\u6539\u8cc7\u6599\u8868\u7d50\u69cb\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-162877","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162877","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=162877"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162877\/revisions"}],"predecessor-version":[{"id":162878,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162877\/revisions\/162878"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162877"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162877"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162877"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}