{"id":179914,"date":"2024-11-09T05:51:19","date_gmt":"2024-11-08T21:51:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179914\/"},"modified":"2024-11-09T05:51:19","modified_gmt":"2024-11-08T21:51:19","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8%e5%b7%b2%e6%9c%89%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e4%b8%ad%e6%96%b0%e5%a2%9e%e5%ad%97%e6%ae%b5%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179914\/","title":{"rendered":"\u5982\u4f55\u5728\u5df2\u6709\u6578\u64da\u5eab\u8868\u4e2d\u65b0\u589e\u5b57\u6bb5\u7684 SQL \u8a9e\u53e5\uff1f (\u6578\u64da\u5eab\u8868\u589e\u52a0\u5b57\u6bb5 sql)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8%e5%b7%b2%e6%9c%89%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e4%b8%ad%e6%96%b0%e5%a2%9e%e5%ad%97%e6%ae%b5%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5%ef%bc%9f-aiYotXfuOQ\">\u5982\u4f55\u5728\u5df2\u6709\u6578\u64da\u5eab\u8868\u4e2d\u65b0\u589e\u5b57\u6bb5\u7684 SQL \u8a9e\u53e5\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u5c0d\u5df2\u6709\u7684\u6578\u64da\u5eab\u8868\u9032\u884c\u4fee\u6539\uff0c\u4ee5\u9069\u61c9\u4e0d\u65b7\u8b8a\u5316\u7684\u696d\u52d9\u9700\u6c42\u3002\u65b0\u589e\u5b57\u6bb5\u662f\u6700\u5e38\u898b\u7684\u64cd\u4f5c\u4e4b\u4e00\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u5728\u5df2\u6709\u6578\u64da\u5eab\u8868\u4e2d\u65b0\u589e\u5b57\u6bb5\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-alter-table-%e8%aa%9e%e5%8f%a5-aiYotXfuOQ\">\u4f7f\u7528 ALTER TABLE \u8a9e\u53e5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u65b0\u589e\u5b57\u6bb5\u7684\u4e3b\u8981\u8a9e\u53e5\u662f <code>ALTER TABLE<\/code>\u3002\u9019\u500b\u8a9e\u53e5\u5141\u8a31\u7528\u6236\u5c0d\u73fe\u6709\u7684\u6578\u64da\u5eab\u8868\u9032\u884c\u7d50\u69cb\u4e0a\u7684\u4fee\u6539\uff0c\u5305\u62ec\u65b0\u589e\u3001\u522a\u9664\u6216\u4fee\u6539\u5b57\u6bb5\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d ADD \u65b0\u5b57\u6bb5\u540d \u6578\u64da\u985e\u578b;<\/code><\/pre>\n<h3 id=\"%e8%aa%9e%e6%b3%95%e8%a7%a3%e6%9e%90-aiYotXfuOQ\">\u8a9e\u6cd5\u89e3\u6790<\/h3>\n<ul>\n<li><strong>\u8868\u540d\uff1a<\/strong>\u9700\u8981\u4fee\u6539\u7684\u6578\u64da\u5eab\u8868\u7684\u540d\u7a31\u3002<\/li>\n<li><strong>\u65b0\u5b57\u6bb5\u540d\uff1a<\/strong>\u8981\u65b0\u589e\u7684\u5b57\u6bb5\u540d\u7a31\u3002<\/li>\n<li><strong>\u6578\u64da\u985e\u578b\uff1a<\/strong>\u65b0\u5b57\u6bb5\u7684\u6578\u64da\u985e\u578b\uff0c\u4f8b\u5982 <code>INT<\/code>\u3001<code>VARCHAR<\/code>\u3001<code>DATE<\/code> \u7b49\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%a4%ba%e4%be%8b-aiYotXfuOQ\">\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u8868\uff0c\u73fe\u5728\u9700\u8981\u65b0\u589e\u4e00\u500b\u540d\u70ba <code>age<\/code> \u7684\u6574\u6578\u578b\u5b57\u6bb5\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users ADD age INT;<\/code><\/pre>\n<p>\u57f7\u884c\u9019\u689d\u8a9e\u53e5\u5f8c\uff0c<code>users<\/code> \u8868\u4e2d\u5c07\u65b0\u589e\u4e00\u500b <code>age<\/code> \u5b57\u6bb5\uff0c\u4e26\u4e14\u8a72\u5b57\u6bb5\u7684\u6578\u64da\u985e\u578b\u70ba\u6574\u6578\u3002<\/p>\n<h3 id=\"%e6%96%b0%e5%a2%9e%e5%a4%9a%e5%80%8b%e5%ad%97%e6%ae%b5-aiYotXfuOQ\">\u65b0\u589e\u591a\u500b\u5b57\u6bb5<\/h3>\n<p>\u5982\u679c\u9700\u8981\u4e00\u6b21\u6027\u65b0\u589e\u591a\u500b\u5b57\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528\u9017\u865f\u5206\u9694\u7684\u65b9\u5f0f\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u9084\u60f3\u65b0\u589e\u4e00\u500b\u540d\u70ba <code>email<\/code> \u7684\u5b57\u7b26\u4e32\u578b\u5b57\u6bb5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users ADD age INT, ADD email VARCHAR(255);<\/code><\/pre>\n<p>\u9019\u6a23\u5c31\u53ef\u4ee5\u5728\u4e00\u6b21\u64cd\u4f5c\u4e2d\u65b0\u589e\u591a\u500b\u5b57\u6bb5\uff0c\u63d0\u5347\u4e86\u6548\u7387\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-aiYotXfuOQ\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u985e\u578b\u9078\u64c7\uff1a<\/strong>\u5728\u65b0\u589e\u5b57\u6bb5\u6642\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u975e\u5e38\u91cd\u8981\u3002\u4e0d\u540c\u7684\u6578\u64da\u985e\u578b\u6703\u5f71\u97ff\u6578\u64da\u7684\u5b58\u5132\u65b9\u5f0f\u548c\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li><strong>\u9ed8\u8a8d\u503c\uff1a<\/strong>\u53ef\u4ee5\u5728\u65b0\u589e\u5b57\u6bb5\u6642\u8a2d\u7f6e\u9ed8\u8a8d\u503c\uff0c\u9019\u6a23\u5728\u672a\u4f86\u63d2\u5165\u6578\u64da\u6642\uff0c\u5982\u679c\u6c92\u6709\u63d0\u4f9b\u8a72\u5b57\u6bb5\u7684\u503c\uff0c\u5247\u6703\u81ea\u52d5\u4f7f\u7528\u9ed8\u8a8d\u503c\u3002\u4f8b\u5982\uff1a<\/li>\n<pre><code>ALTER TABLE users ADD age INT DEFAULT 18;<\/code><\/pre>\n<li><strong>\u5f71\u97ff\u6027\u80fd\uff1a<\/strong>\u5c0d\u65bc\u5927\u578b\u6578\u64da\u8868\uff0c\u65b0\u589e\u5b57\u6bb5\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u9ad8\u4e26\u767c\u7684\u60c5\u6cc1\u4e0b\u3002\u56e0\u6b64\uff0c\u5efa\u8b70\u5728\u696d\u52d9\u4f4e\u5cf0\u671f\u9032\u884c\u6b64\u985e\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-aiYotXfuOQ\">\u7e3d\u7d50<\/h2>\n<p>\u5728\u5df2\u6709\u6578\u64da\u5eab\u8868\u4e2d\u65b0\u589e\u5b57\u6bb5\u662f\u4e00\u9805\u57fa\u672c\u800c\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u901a\u904e\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\uff0c\u53ef\u4ee5\u9748\u6d3b\u5730\u8abf\u6574\u6578\u64da\u5eab\u7d50\u69cb\u4ee5\u6eff\u8db3\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u55ae\u500b\u5b57\u6bb5\u9084\u662f\u591a\u500b\u5b57\u6bb5\u7684\u65b0\u589e\uff0c\u90fd\u9700\u8981\u8b39\u614e\u8003\u616e\u6578\u64da\u985e\u578b\u548c\u6027\u80fd\u5f71\u97ff\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u6578\u64da\u5eab\u7ba1\u7406\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u65b9\u6848\u5c07\u662f\u660e\u667a\u4e4b\u8209\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u6d41\u66a2\u6027\u548c\u5b89\u5168\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u5728\u5df2\u6709\u6578\u64da\u5eab\u8868\u4e2d\u65b0\u589e\u5b57\u6bb5\uff0c\u7c21\u55ae\u6b65\u9a5f\u52a9\u4f60\u8f15\u9b06\u64f4\u5c55\u6578\u64da\u7d50\u69cb\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-179914","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179914","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=179914"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179914\/revisions"}],"predecessor-version":[{"id":179915,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179914\/revisions\/179915"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179914"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179914"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179914"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}