{"id":186618,"date":"2024-11-11T07:25:22","date_gmt":"2024-11-10T23:25:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186618\/"},"modified":"2024-11-11T07:25:23","modified_gmt":"2024-11-10T23:25:23","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%ae%a1%e7%90%86%e5%93%a1%e5%bf%85%e5%82%99%e6%8a%80%e8%83%bd%ef%bc%9a%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3alter%e6%93%8d%e4%bd%9c-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186618\/","title":{"rendered":"\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u5fc5\u5099\u6280\u80fd\uff1a\u6df1\u5165\u7406\u89e3alter\u64cd\u4f5c (\u6578\u64da\u5eab\u4e2d\u7684alter)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%ae%a1%e7%90%86%e5%93%a1%e5%bf%85%e5%82%99%e6%8a%80%e8%83%bd%ef%bc%9a%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3alter%e6%93%8d%e4%bd%9c-AjhkcoYsZk\">\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u5fc5\u5099\u6280\u80fd\uff1a\u6df1\u5165\u7406\u89e3ALTER\u64cd\u4f5c<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cALTER\u64cd\u4f5c\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6307\u4ee4\uff0c\u80fd\u5920\u5e6b\u52a9\u6578\u64da\u5eab\u7ba1\u7406\u54e1\uff08DBA\uff09\u9032\u884c\u7d50\u69cb\u4e0a\u7684\u8abf\u6574\u548c\u512a\u5316\u3002\u7121\u8ad6\u662f\u6dfb\u52a0\u65b0\u5217\u3001\u4fee\u6539\u73fe\u6709\u5217\u7684\u5c6c\u6027\uff0c\u9084\u662f\u522a\u9664\u4e0d\u518d\u9700\u8981\u7684\u5217\uff0cALTER\u64cd\u4f5c\u90fd\u80fd\u5920\u6709\u6548\u5730\u6eff\u8db3\u9019\u4e9b\u9700\u6c42\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eALTER\u64cd\u4f5c\u7684\u57fa\u672c\u6982\u5ff5\u3001\u5e38\u898b\u7528\u6cd5\u53ca\u5176\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"alter%e6%93%8d%e4%bd%9c%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-AjhkcoYsZk\">ALTER\u64cd\u4f5c\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>ALTER\u64cd\u4f5c\u662fSQL\u8a9e\u8a00\u4e2d\u7684\u4e00\u500bDDL\uff08\u6578\u64da\u5b9a\u7fa9\u8a9e\u8a00\uff09\u6307\u4ee4\uff0c\u4e3b\u8981\u7528\u65bc\u4fee\u6539\u6578\u64da\u5eab\u5c0d\u8c61\u7684\u7d50\u69cb\u3002\u9019\u4e9b\u5c0d\u8c61\u53ef\u4ee5\u662f\u8868\u3001\u7d22\u5f15\u3001\u8996\u5716\u7b49\u3002\u901a\u904eALTER\u64cd\u4f5c\uff0cDBA\u53ef\u4ee5\u9748\u6d3b\u5730\u8abf\u6574\u6578\u64da\u5eab\u7684\u7d50\u69cb\uff0c\u4ee5\u9069\u61c9\u4e0d\u65b7\u8b8a\u5316\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n<h2 id=\"alter%e6%93%8d%e4%bd%9c%e7%9a%84%e5%b8%b8%e8%a6%8b%e7%94%a8%e6%b3%95-AjhkcoYsZk\">ALTER\u64cd\u4f5c\u7684\u5e38\u898b\u7528\u6cd5<\/h2>\n<p>ALTER\u64cd\u4f5c\u7684\u4f7f\u7528\u5834\u666f\u975e\u5e38\u5ee3\u6cdb\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u7528\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e6%b7%bb%e5%8a%a0%e6%96%b0%e5%88%97-AjhkcoYsZk\">1. \u6dfb\u52a0\u65b0\u5217<\/h3>\n<p>\u7576\u9700\u8981\u5728\u73fe\u6709\u8868\u4e2d\u6dfb\u52a0\u65b0\u5217\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d ADD \u5217\u540d \u6578\u64da\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5728\u540d\u70ba\u201c\u54e1\u5de5\u201d\u7684\u8868\u4e2d\u6dfb\u52a0\u4e00\u500b\u201c\u51fa\u751f\u65e5\u671f\u201d\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n<pre><code>ALTER TABLE \u54e1\u5de5 ADD \u51fa\u751f\u65e5\u671f DATE;<\/code><\/pre>\n<h3 id=\"2-%e4%bf%ae%e6%94%b9%e5%88%97%e7%9a%84%e5%b1%ac%e6%80%a7-AjhkcoYsZk\">2. \u4fee\u6539\u5217\u7684\u5c6c\u6027<\/h3>\n<p>\u5982\u679c\u9700\u8981\u66f4\u6539\u67d0\u4e00\u5217\u7684\u6578\u64da\u985e\u578b\u6216\u5176\u4ed6\u5c6c\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d MODIFY \u5217\u540d \u65b0\u6578\u64da\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5c07\u201c\u54e1\u5de5\u201d\u8868\u4e2d\u7684\u201c\u85aa\u6c34\u201d\u5217\u7684\u6578\u64da\u985e\u578b\u5f9e\u6574\u6578\u6539\u70ba\u6d6e\u9ede\u6578\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>ALTER TABLE \u54e1\u5de5 MODIFY \u85aa\u6c34 FLOAT;<\/code><\/pre>\n<h3 id=\"3-%e5%88%aa%e9%99%a4%e5%88%97-AjhkcoYsZk\">3. \u522a\u9664\u5217<\/h3>\n<p>\u7576\u67d0\u4e00\u5217\u4e0d\u518d\u9700\u8981\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\u522a\u9664\u8a72\u5217\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d DROP \u5217\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e\u201c\u54e1\u5de5\u201d\u8868\u4e2d\u522a\u9664\u201c\u51fa\u751f\u65e5\u671f\u201d\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>ALTER TABLE \u54e1\u5de5 DROP \u51fa\u751f\u65e5\u671f;<\/code><\/pre>\n<h2 id=\"alter%e6%93%8d%e4%bd%9c%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-AjhkcoYsZk\">ALTER\u64cd\u4f5c\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528ALTER\u64cd\u4f5c\u6642\uff0cDBA\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u4e1f\u5931\u98a8\u96aa\uff1a<\/strong>\u522a\u9664\u5217\u6642\uff0c\u8a72\u5217\u4e2d\u7684\u6240\u6709\u6578\u64da\u5c07\u6703\u6c38\u4e45\u4e1f\u5931\uff0c\u56e0\u6b64\u5728\u57f7\u884c\u6b64\u64cd\u4f5c\u524d\u61c9\u8b39\u614e\u8003\u616e\u3002<\/li>\n<li><strong>\u6027\u80fd\u5f71\u97ff\uff1a<\/strong>ALTER\u64cd\u4f5c\u53ef\u80fd\u6703\u5c0d\u6578\u64da\u5eab\u6027\u80fd\u7522\u751f\u5f71\u97ff\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u8868\u4e0a\u9032\u884c\u7d50\u69cb\u4fee\u6539\u6642\uff0c\u5efa\u8b70\u5728\u4f4e\u5cf0\u671f\u9032\u884c\u3002<\/li>\n<li><strong>\u4e8b\u52d9\u8655\u7406\uff1a<\/strong>\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\u652f\u6301\u5728\u4e8b\u52d9\u4e2d\u57f7\u884cALTER\u64cd\u4f5c\uff0c\u9019\u6a23\u53ef\u4ee5\u5728\u51fa\u73fe\u932f\u8aa4\u6642\u9032\u884c\u56de\u6efe\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-AjhkcoYsZk\">\u7d50\u8ad6<\/h2>\n<p>ALTER\u64cd\u4f5c\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u638c\u63e1\u5176\u7528\u6cd5\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4f86\u8aaa\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u9748\u6d3b\u904b\u7528ALTER\u64cd\u4f5c\uff0cDBA\u80fd\u5920\u6709\u6548\u5730\u8abf\u6574\u6578\u64da\u5eab\u7d50\u69cb\uff0c\u4ee5\u9069\u61c9\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u5316\u3002\u7121\u8ad6\u662f\u6dfb\u52a0\u3001\u4fee\u6539\u9084\u662f\u522a\u9664\u5217\uff0c\u6b63\u78ba\u4f7f\u7528ALTER\u64cd\u4f5c\u90fd\u80fd\u5920\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u9748\u6d3b\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684<a 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