{"id":176741,"date":"2024-11-08T12:21:22","date_gmt":"2024-11-08T04:21:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/176741\/"},"modified":"2024-11-08T12:21:23","modified_gmt":"2024-11-08T04:21:23","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a4-%e5%88%97column_name%e4%b8%8d%e5%8f%af%e7%82%ba%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/176741\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa4 &#8211; \u5217&#8217;column_name&#8217;\u4e0d\u53ef\u70ba\u7a7a"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a4-%e5%88%97column_name%e4%b8%8d%e5%8f%af%e7%82%ba%e7%a9%ba-xKYxXtFDjX\">\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa4 &#8211; \u5217&#8217;column_name&#8217;\u4e0d\u53ef\u70ba\u7a7a<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u7d93\u5e38\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u300c\u5217&#8217;column_name&#8217;\u4e0d\u53ef\u70ba\u7a7a\u300d\u7684\u932f\u8aa4\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u5617\u8a66\u63d2\u5165\u6216\u66f4\u65b0\u6578\u64da\u6642\uff0c\u7576\u67d0\u500b\u5fc5\u586b\u5b57\u6bb5\u672a\u63d0\u4f9b\u503c\u6642\uff0cMySQL\u6703\u8fd4\u56de\u9019\u500b\u932f\u8aa4\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e5%8e%9f%e5%9b%a0-xKYxXtFDjX\">\u932f\u8aa4\u539f\u56e0<\/h2>\n<p>\u9019\u500b\u932f\u8aa4\u7684\u4e3b\u8981\u539f\u56e0\u662f\u6578\u64da\u5eab\u8868\u4e2d\u7684\u67d0\u4e00\u5217\u88ab\u8a2d\u7f6e\u70ba\u4e0d\u5141\u8a31\u70ba\u7a7a\uff08NOT NULL\uff09\uff0c\u800c\u5728\u57f7\u884c\u63d2\u5165\u6216\u66f4\u65b0\u64cd\u4f5c\u6642\uff0c\u672a\u63d0\u4f9b\u8a72\u5217\u7684\u503c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li><strong>\u63d2\u5165\u64cd\u4f5c\u4e2d\u7f3a\u5c11\u5fc5\u586b\u5b57\u6bb5\uff1a<\/strong>\u7576\u4f60\u5617\u8a66\u63d2\u5165\u4e00\u689d\u65b0\u8a18\u9304\uff0c\u4f46\u672a\u63d0\u4f9b\u67d0\u4e9b\u5fc5\u586b\u5b57\u6bb5\u7684\u503c\u6642\uff0c\u6703\u5c0e\u81f4\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>\u66f4\u65b0\u64cd\u4f5c\u4e2d\u672a\u63d0\u4f9b\u503c\uff1a<\/strong>\u5728\u66f4\u65b0\u73fe\u6709\u8a18\u9304\u6642\uff0c\u5982\u679c\u5c07\u67d0\u500b\u5fc5\u586b\u5b57\u6bb5\u7684\u503c\u8a2d\u7f6e\u70baNULL\uff0c\u4e5f\u6703\u5f15\u767c\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>\u6578\u64da\u5eab\u7d50\u69cb\u8b8a\u66f4\uff1a<\/strong>\u5982\u679c\u5728\u6578\u64da\u5eab\u7d50\u69cb\u4e2d\u66f4\u6539\u4e86\u67d0\u4e00\u5217\u7684\u5c6c\u6027\uff0c\u5c07\u5176\u8a2d\u7f6e\u70baNOT NULL\uff0c\u4f46\u61c9\u7528\u7a0b\u5e8f\u672a\u76f8\u61c9\u66f4\u65b0\uff0c\u5247\u53ef\u80fd\u6703\u51fa\u73fe\u6b64\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e6%ad%a4%e9%8c%af%e8%aa%a4-xKYxXtFDjX\">\u5982\u4f55\u4fee\u5fa9\u6b64\u932f\u8aa4<\/h2>\n<p>\u4fee\u5fa9\u300c\u5217&#8217;column_name&#8217;\u4e0d\u53ef\u70ba\u7a7a\u300d\u7684\u932f\u8aa4\u901a\u5e38\u6d89\u53ca\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b5%90%e6%a7%8b-xKYxXtFDjX\">1. \u6aa2\u67e5\u6578\u64da\u5eab\u7d50\u69cb<\/h3>\n<p>\u9996\u5148\uff0c\u6aa2\u67e5\u6578\u64da\u5eab\u8868\u7684\u7d50\u69cb\uff0c\u78ba\u4fdd\u4f60\u4e86\u89e3\u54ea\u4e9b\u5217\u662f\u5fc5\u586b\u7684\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u67e5\u770b\u8868\u7d50\u69cb\uff1a<\/p>\n<pre><code>DESCRIBE your_table_name;<\/code><\/pre>\n<p>\u9019\u5c07\u986f\u793a\u8868\u4e2d\u6240\u6709\u5217\u7684\u8a73\u7d30\u4fe1\u606f\uff0c\u5305\u62ec\u5b83\u5011\u7684\u6578\u64da\u985e\u578b\u548c\u662f\u5426\u5141\u8a31\u70baNULL\u3002<\/p>\n<h3 id=\"2-%e7%a2%ba%e8%aa%8d%e6%8f%92%e5%85%a5%e6%88%96%e6%9b%b4%e6%96%b0%e7%9a%84%e6%95%b8%e6%93%9a-xKYxXtFDjX\">2. \u78ba\u8a8d\u63d2\u5165\u6216\u66f4\u65b0\u7684\u6578\u64da<\/h3>\n<p>\u5728\u57f7\u884c\u63d2\u5165\u6216\u66f4\u65b0\u64cd\u4f5c\u4e4b\u524d\uff0c\u78ba\u4fdd\u63d0\u4f9b\u4e86\u6240\u6709\u5fc5\u586b\u5b57\u6bb5\u7684\u503c\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u4ee5\u4e0b\u63d2\u5165\u8a9e\u53e5\uff1a<\/p>\n<pre><code>INSERT INTO your_table_name (column1, column2) VALUES (value1, NULL);<\/code><\/pre>\n<p>\u5982\u679ccolumn2\u88ab\u8a2d\u7f6e\u70baNOT NULL\uff0c\u5247\u9700\u8981\u63d0\u4f9b\u4e00\u500b\u6709\u6548\u7684\u503c\uff0c\u800c\u4e0d\u662fNULL\u3002<\/p>\n<h3 id=\"3-%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b5%90%e6%a7%8b%ef%bc%88%e5%a6%82%e6%9c%89%e5%bf%85%e8%a6%81%ef%bc%89-xKYxXtFDjX\">3. \u4fee\u6539\u6578\u64da\u5eab\u7d50\u69cb\uff08\u5982\u6709\u5fc5\u8981\uff09<\/h3>\n<p>\u5982\u679c\u78ba\u5be6\u9700\u8981\u67d0\u4e00\u5217\u53ef\u4ee5\u70baNULL\uff0c\u53ef\u4ee5\u8003\u616e\u4fee\u6539\u6578\u64da\u5eab\u7d50\u69cb\uff0c\u5c07\u8a72\u5217\u7684\u5c6c\u6027\u66f4\u6539\u70ba\u5141\u8a31NULL\u3002\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE your_table_name MODIFY column_name column_type NULL;<\/code><\/pre>\n<p>\u8acb\u6ce8\u610f\uff0c\u9019\u6a23\u7684\u66f4\u6539\u53ef\u80fd\u6703\u5f71\u97ff\u61c9\u7528\u7a0b\u5e8f\u7684\u908f\u8f2f\uff0c\u56e0\u6b64\u5728\u9032\u884c\u6b64\u64cd\u4f5c\u4e4b\u524d\uff0c\u8acb\u4ed4\u7d30\u8003\u616e\u3002<\/p>\n<h3 id=\"4-%e6%aa%a2%e6%9f%a5%e6%87%89%e7%94%a8%e7%a8%8b%e5%ba%8f%e9%82%8f%e8%bc%af-xKYxXtFDjX\">4. \u6aa2\u67e5\u61c9\u7528\u7a0b\u5e8f\u908f\u8f2f<\/h3>\n<p>\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u5728\u57f7\u884c\u63d2\u5165\u6216\u66f4\u65b0\u64cd\u4f5c\u6642\uff0c\u6b63\u78ba\u8655\u7406\u6240\u6709\u5fc5\u586b\u5b57\u6bb5\u3002\u9019\u53ef\u80fd\u6d89\u53ca\u6aa2\u67e5\u7528\u6236\u8f38\u5165\u7684\u6578\u64da\uff0c\u4e26\u5728\u5fc5\u8981\u6642\u63d0\u4f9b\u9ed8\u8a8d\u503c\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b-xKYxXtFDjX\">\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u5305\u542b\u4ee5\u4e0b\u5217\uff1a<\/p>\n<ul>\n<li>id (INT, PRIMARY KEY)<\/li>\n<li>username (VARCHAR, NOT NULL)<\/li>\n<li>email (VARCHAR, NOT NULL)<\/li>\n<\/ul>\n<p>\u5982\u679c\u4f60\u5617\u8a66\u57f7\u884c\u4ee5\u4e0b\u63d2\u5165\u64cd\u4f5c\uff1a<\/p>\n<pre><code>INSERT INTO users (username, email) VALUES ('john_doe', NULL);<\/code><\/pre>\n<p>\u5c07\u6703\u5f15\u767c\u300c\u5217&#8217;email&#8217;\u4e0d\u53ef\u70ba\u7a7a\u300d\u7684\u932f\u8aa4\u3002\u8981\u4fee\u5fa9\u6b64\u932f\u8aa4\uff0c\u4f60\u9700\u8981\u63d0\u4f9b\u4e00\u500b\u6709\u6548\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff1a<\/p>\n<pre><code>INSERT INTO users (username, email) VALUES ('john_doe', 'john@example.com');<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-xKYxXtFDjX\">\u7e3d\u7d50<\/h2>\n<p>\u4fee\u5fa9MySQL\u4e2d\u7684\u300c\u5217&#8217;column_name&#8217;\u4e0d\u53ef\u70ba\u7a7a\u300d\u932f\u8aa4\u9700\u8981\u4ed4\u7d30\u6aa2\u67e5\u6578\u64da\u5eab\u7d50\u69cb\u3001\u63d2\u5165\u6216\u66f4\u65b0\u7684\u6578\u64da\u4ee5\u53ca\u61c9\u7528\u7a0b\u5e8f\u908f\u8f2f\u3002\u901a\u904e\u9075\u5faa\u4e0a\u8ff0\u6b65\u9a5f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u6b64\u554f\u984c\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u9806\u5229\u9032\u884c\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u652f\u6301\u6216\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\u4f86\u63d0\u5347\u60a8\u7684\u6578\u64da\u5eab\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa4\u300c\u5217&#8217;column_name&#8217;\u4e0d\u53ef\u70ba\u7a7a\u300d\uff0c\u89e3\u6c7a\u6578\u64da\u5eab\u4e2d\u7684\u7a7a\u503c\u554f\u984c\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\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-176741","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/176741","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=176741"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/176741\/revisions"}],"predecessor-version":[{"id":176742,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/176741\/revisions\/176742"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=176741"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=176741"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=176741"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}