{"id":76030,"date":"2024-10-16T03:16:16","date_gmt":"2024-10-15T19:16:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76030\/"},"modified":"2024-10-16T03:16:16","modified_gmt":"2024-10-15T19:16:16","slug":"mysql-%e7%b0%a1%e5%96%ae%e6%93%8d%e4%bd%9c%e4%b9%8balter-table%e6%94%b9%e8%ae%8a%e8%a1%a8%e7%9a%84%e7%b5%90%e6%a7%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76030\/","title":{"rendered":"MySQL \u7c21\u55ae\u64cd\u4f5c\u4e4bALTER TABLE\u6539\u8b8a\u8868\u7684\u7d50\u69cb"},"content":{"rendered":"<h1 id=\"mysql-%e7%b0%a1%e5%96%ae%e6%93%8d%e4%bd%9c%e4%b9%8balter-table%e6%94%b9%e8%ae%8a%e8%a1%a8%e7%9a%84%e7%b5%90%e6%a7%8b-WcTXYHxzwc\">MySQL \u7c21\u55ae\u64cd\u4f5c\u4e4bALTER TABLE\u6539\u8b8a\u8868\u7684\u7d50\u69cb<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL \u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u7cfb\u7d71\u3002\u7576\u6211\u5011\u9700\u8981\u4fee\u6539\u8cc7\u6599\u8868\u7684\u7d50\u69cb\u6642\uff0cALTER TABLE \u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u6307\u4ee4\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528 ALTER TABLE \u6307\u4ee4\u4f86\u6539\u8b8a\u8cc7\u6599\u8868\u7684\u7d50\u69cb\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"alter-table-%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-WcTXYHxzwc\">ALTER TABLE \u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>ALTER TABLE \u6307\u4ee4\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    action;<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>table_name<\/code> \u662f\u4f60\u8981\u4fee\u6539\u7684\u8cc7\u6599\u8868\u540d\u7a31\uff0c\u800c <code>action<\/code> \u5247\u662f\u4f60\u5e0c\u671b\u57f7\u884c\u7684\u64cd\u4f5c\u3002\u5e38\u898b\u7684\u64cd\u4f5c\u5305\u62ec\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u6b04\u4f4d\u3002<\/p>\n<h2 id=\"%e6%b7%bb%e5%8a%a0%e6%ac%84%e4%bd%8d-WcTXYHxzwc\">\u6dfb\u52a0\u6b04\u4f4d<\/h2>\n<p>\u5982\u679c\u4f60\u9700\u8981\u5728\u8cc7\u6599\u8868\u4e2d\u6dfb\u52a0\u65b0\u7684\u6b04\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    ADD column_name column_type;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u8cc7\u6599\u8868\uff0c\u4e26\u5e0c\u671b\u6dfb\u52a0\u4e00\u500b\u540d\u70ba <code>age<\/code> \u7684\u6574\u6578\u6b04\u4f4d\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    ADD age INT;<\/code><\/pre>\n<h2 id=\"%e5%88%aa%e9%99%a4%e6%ac%84%e4%bd%8d-WcTXYHxzwc\">\u522a\u9664\u6b04\u4f4d<\/h2>\n<p>\u5982\u679c\u9700\u8981\u522a\u9664\u67d0\u500b\u6b04\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>DROP<\/code> \u64cd\u4f5c\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    DROP column_name;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e <code>users<\/code> \u8cc7\u6599\u8868\u4e2d\u522a\u9664 <code>age<\/code> \u6b04\u4f4d\uff0c\u53ef\u4ee5\u9019\u6a23\u57f7\u884c\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    DROP age;<\/code><\/pre>\n<h2 id=\"%e4%bf%ae%e6%94%b9%e6%ac%84%e4%bd%8d-WcTXYHxzwc\">\u4fee\u6539\u6b04\u4f4d<\/h2>\n<p>\u82e5\u8981\u4fee\u6539\u73fe\u6709\u6b04\u4f4d\u7684\u8cc7\u6599\u985e\u578b\u6216\u540d\u7a31\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>MODIFY<\/code> \u6216 <code>CHANGE<\/code> \u64cd\u4f5c\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    MODIFY column_name new_column_type;<\/code><\/pre>\n<p>\u6216\u662f\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    CHANGE old_column_name new_column_name new_column_type;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5c07 <code>users<\/code> \u8cc7\u6599\u8868\u4e2d\u7684 <code>age<\/code> \u6b04\u4f4d\u6539\u70ba <code>VARCHAR(3)<\/code> \u985e\u578b\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    MODIFY age VARCHAR(3);<\/code><\/pre>\n<p>\u5982\u679c\u4f60\u60f3\u8981\u5c07 <code>age<\/code> \u6b04\u4f4d\u6539\u540d\u70ba <code>user_age<\/code>\uff0c\u4e26\u540c\u6642\u6539\u8b8a\u5176\u985e\u578b\uff0c\u53ef\u4ee5\u9019\u6a23\u57f7\u884c\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    CHANGE age user_age VARCHAR(3);<\/code><\/pre>\n<h2 id=\"%e6%b7%bb%e5%8a%a0%e4%b8%bb%e9%8d%b5%e5%92%8c%e7%b4%a2%e5%bc%95-WcTXYHxzwc\">\u6dfb\u52a0\u4e3b\u9375\u548c\u7d22\u5f15<\/h2>\n<p>ALTER TABLE \u4e5f\u53ef\u4ee5\u7528\u4f86\u6dfb\u52a0\u4e3b\u9375\u6216\u7d22\u5f15\u3002\u6dfb\u52a0\u4e3b\u9375\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    ADD PRIMARY KEY (column_name);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5c07 <code>id<\/code> \u6b04\u4f4d\u8a2d\u70ba <code>users<\/code> \u8cc7\u6599\u8868\u7684\u4e3b\u9375\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    ADD PRIMARY KEY (id);<\/code><\/pre>\n<p>\u6dfb\u52a0\u7d22\u5f15\u7684\u8a9e\u6cd5\u5247\u662f\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    ADD INDEX index_name (column_name);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5728 <code>email<\/code> \u6b04\u4f4d\u4e0a\u6dfb\u52a0\u7d22\u5f15\uff0c\u53ef\u4ee5\u9019\u6a23\u57f7\u884c\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    ADD INDEX idx_email (email);<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-WcTXYHxzwc\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 ALTER TABLE \u6307\u4ee4\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u7279\u5225\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5728\u9032\u884c\u7d50\u69cb\u4fee\u6539\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u8cc7\u6599\u8868\uff0c\u4ee5\u9632\u6b62\u8cc7\u6599\u907a\u5931\u3002<\/li>\n<li>\u67d0\u4e9b\u64cd\u4f5c\u53ef\u80fd\u6703\u9396\u5b9a\u8cc7\u6599\u8868\uff0c\u5f71\u97ff\u5176\u4ed6\u4f7f\u7528\u8005\u7684\u5b58\u53d6\u3002<\/li>\n<li>\u5728\u5927\u578b\u8cc7\u6599\u8868\u4e0a\u57f7\u884c ALTER TABLE \u53ef\u80fd\u9700\u8981\u8f03\u9577\u7684\u6642\u9593\uff0c\u8acb\u63d0\u524d\u8a55\u4f30\u5f71\u97ff\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-WcTXYHxzwc\">\u7e3d\u7d50<\/h2>\n<p>ALTER TABLE \u662f MySQL \u4e2d\u4e00\u500b\u5f37\u5927\u7684\u6307\u4ee4\uff0c\u80fd\u5920\u9748\u6d3b\u5730\u6539\u8b8a\u8cc7\u6599\u8868\u7684\u7d50\u69cb\u3002\u7121\u8ad6\u662f\u6dfb\u52a0\u3001\u522a\u9664\u9084\u662f\u4fee\u6539\u6b04\u4f4d\uff0c\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u5728 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u4e0a\u904b\u884c MySQL\uff0c\u6216\u662f\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u96a8\u6642\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528MySQL\u7684ALTER TABLE\u547d\u4ee4\u8f15\u9b06\u6539\u8b8a\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-76030","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76030","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=76030"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76030\/revisions"}],"predecessor-version":[{"id":76031,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76030\/revisions\/76031"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76030"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76030"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76030"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}