{"id":143847,"date":"2024-11-01T01:45:20","date_gmt":"2024-10-31T17:45:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143847\/"},"modified":"2024-11-01T01:45:21","modified_gmt":"2024-10-31T17:45:21","slug":"sql-%e6%95%99%e7%a8%8b%ef%bc%9a%e5%a6%82%e4%bd%95%e7%82%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e5%a2%9e%e5%8a%a0%e6%96%b0%e5%88%97%ef%bc%9f-sql-%e7%b5%a6%e8%a1%a8%e5%a2%9e%e5%8a%a0%e4%b8%80%e5%88%97","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143847\/","title":{"rendered":"SQL \u6559\u7a0b\uff1a\u5982\u4f55\u70ba\u6578\u64da\u5eab\u8868\u589e\u52a0\u65b0\u5217\uff1f (sql \u7d66\u8868\u589e\u52a0\u4e00\u5217\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%99%e7%a8%8b%ef%bc%9a%e5%a6%82%e4%bd%95%e7%82%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e5%a2%9e%e5%8a%a0%e6%96%b0%e5%88%97%ef%bc%9f-JtDMxmIYRQ\">SQL \u6559\u7a0b\uff1a\u5982\u4f55\u70ba\u6578\u64da\u5eab\u8868\u589e\u52a0\u65b0\u5217\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u5c0d\u8868\u9032\u884c\u4fee\u6539\uff0c\u4ee5\u9069\u61c9\u4e0d\u65b7\u8b8a\u5316\u7684\u696d\u52d9\u9700\u6c42\u3002\u589e\u52a0\u65b0\u5217\u662f\u6700\u5e38\u898b\u7684\u64cd\u4f5c\u4e4b\u4e00\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5982\u4f55\u5728 SQL \u4e2d\u70ba\u6578\u64da\u5eab\u8868\u589e\u52a0\u65b0\u5217\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-sql-%e7%9a%84-alter-table-%e8%aa%9e%e5%8f%a5%ef%bc%9f-JtDMxmIYRQ\">\u4ec0\u9ebc\u662f SQL \u7684 ALTER TABLE \u8a9e\u53e5\uff1f<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c<code>ALTER TABLE<\/code> \u8a9e\u53e5\u7528\u65bc\u4fee\u6539\u5df2\u5b58\u5728\u7684\u6578\u64da\u5eab\u8868\u3002\u9019\u500b\u8a9e\u53e5\u53ef\u4ee5\u7528\u4f86\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u8868\u4e2d\u7684\u5217\u3002\u7576\u6211\u5011\u9700\u8981\u70ba\u8868\u589e\u52a0\u65b0\u5217\u6642\uff0c\u4f7f\u7528 <code>ALTER TABLE<\/code> \u662f\u6700\u5408\u9069\u7684\u9078\u64c7\u3002<\/p>\n<h2 id=\"%e5%a2%9e%e5%8a%a0%e6%96%b0%e5%88%97%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-JtDMxmIYRQ\">\u589e\u52a0\u65b0\u5217\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u589e\u52a0\u65b0\u5217\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d\nADD \u5217\u540d \u6578\u64da\u985e\u578b [\u7d04\u675f\u689d\u4ef6];<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<strong>\u8868\u540d<\/strong> \u662f\u4f60\u8981\u4fee\u6539\u7684\u8868\u7684\u540d\u7a31\uff0c<strong>\u5217\u540d<\/strong> \u662f\u4f60\u8981\u6dfb\u52a0\u7684\u65b0\u5217\u7684\u540d\u7a31\uff0c<strong>\u6578\u64da\u985e\u578b<\/strong> \u662f\u65b0\u5217\u7684\u6578\u64da\u985e\u578b\uff08\u5982 <code>VARCHAR<\/code>, <code>INT<\/code>, <code>DATE<\/code> \u7b49\uff09\uff0c\u800c <strong>\u7d04\u675f\u689d\u4ef6<\/strong> \u662f\u53ef\u9078\u7684\uff0c\u7528\u65bc\u5b9a\u7fa9\u8a72\u5217\u7684\u7d04\u675f\uff08\u5982 <code>NOT NULL<\/code>, <code>UNIQUE<\/code> \u7b49\uff09\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e7%82%ba%e7%94%a8%e6%88%b6%e8%a1%a8%e5%a2%9e%e5%8a%a0%e6%96%b0%e5%88%97-JtDMxmIYRQ\">\u793a\u4f8b\uff1a\u70ba\u7528\u6236\u8868\u589e\u52a0\u65b0\u5217<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u8868\uff0c\u73fe\u5728\u6211\u5011\u60f3\u8981\u70ba\u9019\u500b\u8868\u589e\u52a0\u4e00\u500b\u540d\u70ba <code>age<\/code> \u7684\u65b0\u5217\uff0c\u6578\u64da\u985e\u578b\u70ba <code>INT<\/code>\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users\nADD age INT;<\/code><\/pre>\n<p>\u57f7\u884c\u9019\u689d\u8a9e\u53e5\u5f8c\uff0c<code>users<\/code> \u8868\u4e2d\u5c07\u6703\u65b0\u589e\u4e00\u500b\u540d\u70ba <code>age<\/code> \u7684\u6574\u6578\u985e\u578b\u5217\u3002<\/p>\n<h2 id=\"%e5%a2%9e%e5%8a%a0%e5%a4%9a%e5%80%8b%e5%88%97-JtDMxmIYRQ\">\u589e\u52a0\u591a\u500b\u5217<\/h2>\n<p>\u5982\u679c\u9700\u8981\u4e00\u6b21\u6027\u589e\u52a0\u591a\u500b\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u9017\u865f\u5206\u9694\u7684\u65b9\u5f0f\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u9084\u60f3\u70ba <code>users<\/code> \u8868\u589e\u52a0\u4e00\u500b\u540d\u70ba <code>email<\/code> \u7684\u65b0\u5217\uff0c\u6578\u64da\u985e\u578b\u70ba <code>VARCHAR(255)<\/code>\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users\nADD age INT,\nADD email VARCHAR(255);<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-JtDMxmIYRQ\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u985e\u578b\u9078\u64c7\uff1a<\/strong>\u5728\u9078\u64c7\u6578\u64da\u985e\u578b\u6642\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u985e\u578b\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u5b8c\u6574\u6027\u3002<\/li>\n<li><strong>\u7d04\u675f\u689d\u4ef6\uff1a<\/strong>\u5982\u679c\u65b0\u5217\u9700\u8981\u7279\u5b9a\u7684\u7d04\u675f\u689d\u4ef6\uff0c\u61c9\u5728\u6dfb\u52a0\u5217\u6642\u4e00\u4f75\u6307\u5b9a\uff0c\u4ee5\u907f\u514d\u5f8c\u7e8c\u7684\u6578\u64da\u4e0d\u4e00\u81f4\u554f\u984c\u3002<\/li>\n<li><strong>\u5099\u4efd\u6578\u64da\uff1a<\/strong>\u5728\u5c0d\u6578\u64da\u5eab\u9032\u884c\u7d50\u69cb\u4fee\u6539\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u60c5\u6cc1\u5c0e\u81f4\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-JtDMxmIYRQ\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u53ef\u4ee5\u65b9\u4fbf\u5730\u70ba\u6578\u64da\u5eab\u8868\u589e\u52a0\u65b0\u5217\u3002\u7121\u8ad6\u662f\u55ae\u500b\u5217\u9084\u662f\u591a\u500b\u5217\u7684\u6dfb\u52a0\uff0c\u6b63\u78ba\u7684\u8a9e\u6cd5\u548c\u6ce8\u610f\u4e8b\u9805\u90fd\u80fd\u5e6b\u52a9\u6211\u5011\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u7d50\u69cb\u3002\u5c0d\u65bc\u9700\u8981\u9748\u6d3b\u64f4\u5c55\u7684\u61c9\u7528\uff0c\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u7db2\u7ad9\u6258\u7ba1\uff0c\u6211\u5011\u7684\u670d\u52d9\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728 SQL \u4e2d\u70ba\u6578\u64da\u5eab\u8868\u589e\u52a0\u65b0\u5217\uff0c\u638c\u63e1 ALTER TABLE \u8a9e\u53e5\u7684\u4f7f\u7528\uff0c\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-143847","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143847","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=143847"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143847\/revisions"}],"predecessor-version":[{"id":143848,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143847\/revisions\/143848"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143847"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143847"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143847"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}