{"id":6530,"date":"2024-11-14T14:42:15","date_gmt":"2024-11-14T06:42:15","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6530\/"},"modified":"2024-11-14T14:42:15","modified_gmt":"2024-11-14T06:42:15","slug":"mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e6%80%8e%e4%b9%88%e5%88%a0%e9%99%a4%e7%ba%a6%e6%9d%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6530\/","title":{"rendered":"mysql\u6570\u636e\u5e93\u600e\u4e48\u5220\u9664\u7ea6\u675f"},"content":{"rendered":"<blockquote><p>\n  \u5728 mysql \u6570\u636e\u5e93\u4e2d\u5220\u9664\u7ea6\u675f\uff0c\u4f7f\u7528 alter table \u8bed\u53e5\uff0c\u6307\u5b9a\u8981\u5220\u9664\u7684\u7ea6\u675f\u540d\u79f0\u3002\u6b65\u9aa4\uff1a1. \u786e\u5b9a\u7ea6\u675f\u540d\u79f0\uff1b2. \u7f16\u5199 alter table \u8bed\u53e5\uff0c\u6307\u5b9a\u8868\u540d\u548c\u7ea6\u675f\u540d\u79f0\uff1b3. \u6267\u884c\u8bed\u53e5\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202408\/05\/2024080519522856962.jpg\" class=\"aligncenter\" title=\"mysql\u6570\u636e\u5e93\u600e\u4e48\u5220\u9664\u7ea6\u675f\u63d2\u56fe\" alt=\"mysql\u6570\u636e\u5e93\u600e\u4e48\u5220\u9664\u7ea6\u675f\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5728 MySQL \u6570\u636e\u5e93\u4e2d\u5220\u9664\u7ea6\u675f<\/strong><\/p>\n<p>\u5220\u9664 MySQL \u6570\u636e\u5e93\u8868\u4e2d\u7684\u7ea6\u675f\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u4f7f\u7528 ALTER TABLE \u8bed\u53e5\u5e76\u6307\u5b9a\u8981\u5220\u9664\u7684\u7ea6\u675f\u540d\u79f0\u5373\u53ef\u3002<\/p>\n<p><strong>\u8bed\u6cd5\uff1a<\/strong><\/p>\n<pre>ALTER TABLE table_name\nDROP CONSTRAINT constraint_name;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6b65\u9aa4\uff1a<\/strong><\/p>\n<ol>\n<li> <strong>\u786e\u5b9a\u7ea6\u675f\u540d\u79f0\uff1a<\/strong>\u8981\u5220\u9664\u7ea6\u675f\uff0c\u9996\u5148\u9700\u8981\u77e5\u9053\u5b83\u7684\u540d\u79f0\u3002\u53ef\u4ee5\u4f7f\u7528 SHOW CREATE TABLE \u8bed\u53e5\u6765\u67e5\u770b\u8868\u7ed3\u6784\u5e76\u786e\u5b9a\u7ea6\u675f\u540d\u79f0\u3002<\/li>\n<li> <strong>\u7f16\u5199 DELETE \u8bed\u53e5\uff1a<\/strong>\u6839\u636e\u8bed\u6cd5\u7f16\u5199 ALTER TABLE \u8bed\u53e5\uff0c\u6307\u5b9a\u8868\u540d\u548c\u8981\u5220\u9664\u7684\u7ea6\u675f\u540d\u79f0\u3002<\/li>\n<li> <strong>\u6267\u884c\u8bed\u53e5\uff1a<\/strong>\u5728 MySQL \u547d\u4ee4\u63d0\u793a\u7b26\u4e0b\u6267\u884c ALTER TABLE \u8bed\u53e5\u3002<\/li>\n<\/ol>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p>\u8981\u5220\u9664\u540d\u4e3a student_fk \u7684\u5916\u952e\u7ea6\u675f\uff1a<\/p>\n<pre>ALTER TABLE students\nDROP CONSTRAINT student_fk;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n<ul>\n<li>\u786e\u4fdd\u60a8\u5220\u9664\u7684\u7ea6\u675f\u4e0d\u518d\u9700\u8981\u3002<\/li>\n<li>\u5982\u679c\u8868\u4e2d\u5b58\u5728\u4f9d\u8d56\u4e8e\u8be5\u7ea6\u675f\u7684\u6570\u636e\uff0c\u5219\u5220\u9664\u7ea6\u675f\u53ef\u80fd\u4f1a\u5bfc\u81f4\u3002<\/li>\n<li>\u5728\u6267\u884c ALTER TABLE \u8bed\u53e5\u4e4b\u524d\u5907\u4efd\u60a8\u7684\u6570\u636e\u5e93\u662f\u4e2a\u597d\u4e3b\u610f\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u6570\u636e\u5e93\u600e\u4e48\u5220\u9664\u7ea6\u675f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 mysql \u6570\u636e\u5e93\u4e2d\u5220\u9664\u7ea6\u675f\uff0c\u4f7f\u7528 alter table \u8bed\u53e5\uff0c\u6307\u5b9a\u8981\u5220\u9664\u7684\u7ea6\u675f\u540d\u79f0\u3002\u6b65\u9aa4\uff1a1. \u786e\u5b9a\u7ea6\u675f\u540d\u79f0\uff1b2. \u7f16\u5199 alter table \u8bed\u53e5\uff0c\u6307\u5b9a\u8868\u540d\u548c\u7ea6\u675f\u540d\u79f0\uff1b3. \u6267\u884c\u8bed\u53e5\u3002 \u5982\u4f55\u5728 MySQL \u6570\u636e\u5e93\u4e2d\u5220\u9664\u7ea6\u675f \u5220\u9664 MySQL \u6570\u636e\u5e93\u8868\u4e2d\u7684\u7ea6\u675f\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u4f7f\u7528 ALTER TABLE \u8bed\u53e5\u5e76\u6307\u5b9a\u8981\u5220\u9664\u7684\u7ea6\u675f\u540d\u79f0\u5373\u53ef\u3002 \u8bed\u6cd5\uff1a ALTER TABLE table_name DROP CONSTRAINT constraint_name; \u767b\u5f55\u540e\u590d\u5236 \u6b65\u9aa4\uff1a \u786e\u5b9a\u7ea6\u675f\u540d\u79f0\uff1a\u8981\u5220\u9664\u7ea6\u675f\uff0c\u9996\u5148\u9700\u8981\u77e5\u9053\u5b83\u7684\u540d\u79f0\u3002\u53ef\u4ee5\u4f7f\u7528 SHOW CREATE TABLE \u8bed\u53e5\u6765\u67e5\u770b\u8868\u7ed3\u6784\u5e76\u786e\u5b9a\u7ea6\u675f\u540d\u79f0\u3002 \u7f16\u5199 DELETE \u8bed\u53e5\uff1a\u6839\u636e\u8bed\u6cd5\u7f16\u5199 ALTER TABLE \u8bed\u53e5\uff0c\u6307\u5b9a\u8868\u540d\u548c\u8981\u5220\u9664\u7684\u7ea6\u675f\u540d\u79f0\u3002 \u6267\u884c\u8bed\u53e5\uff1a\u5728 MySQL \u547d\u4ee4\u63d0\u793a\u7b26\u4e0b\u6267\u884c ALTER TABLE \u8bed\u53e5\u3002 \u793a\u4f8b\uff1a \u8981\u5220\u9664\u540d\u4e3a student_fk \u7684\u5916\u952e\u7ea6\u675f\uff1a ALTER TABLE students DROP [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-6530","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6530","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=6530"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6530\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6530"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6530"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6530"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}