{"id":5892,"date":"2024-11-14T11:26:30","date_gmt":"2024-11-14T03:26:30","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5892\/"},"modified":"2024-11-14T11:26:30","modified_gmt":"2024-11-14T03:26:30","slug":"sql%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\/5892\/","title":{"rendered":"sql\u600e\u4e48\u5220\u9664\u7ea6\u675f"},"content":{"rendered":"<blockquote><p>\n  \u5728 sql \u4e2d\u5220\u9664\u7ea6\u675f\uff0c\u8bf7\u6267\u884c\u4ee5\u4e0b\u6b65\u9aa4\uff1a\u8bc6\u522b\u8981\u5220\u9664\u7684\u7ea6\u675f\u540d\u79f0\uff1b\u4f7f\u7528 alter table \u8bed\u53e5\uff1aalter table \u8868\u540d drop constraint \u7ea6\u675f\u540d\uff1b\u786e\u8ba4\u5220\u9664\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202406\/03\/2024060321485263322.jpg\" class=\"aligncenter\" title=\"sql\u600e\u4e48\u5220\u9664\u7ea6\u675f\u63d2\u56fe\" alt=\"sql\u600e\u4e48\u5220\u9664\u7ea6\u675f\u63d2\u56fe\" \/><\/p>\n<h2>\u5982\u4f55\u5728 SQL \u4e2d\u5220\u9664\u7ea6\u675f<\/h2>\n<p>SQL \u4e2d\u7684\u7ea6\u675f\u7528\u4e8e\u9650\u5236\u548c\u9a8c\u8bc1\u8868\u4e2d\u7684\u6570\u636e\u3002\u5982\u679c\u60a8\u9700\u8981\u4ece\u8868\u4e2d\u5220\u9664\u7ea6\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n<h3>1. \u6807\u8bc6\u8981\u5220\u9664\u7684\u7ea6\u675f<\/h3>\n<p>\u9996\u5148\uff0c\u60a8\u9700\u8981\u6807\u8bc6\u8981\u5220\u9664\u7684\u7ea6\u675f\u7684\u540d\u79f0\u3002\u53ef\u4ee5\u901a\u8fc7\u67e5\u8be2\u8868\u4fe1\u606f\u6765\u83b7\u53d6\u6b64\u4fe1\u606f\uff1a<\/p>\n<pre>SELECT constraint_name, constraint_type\nFROM information_schema.table_constraints\nWHERE table_name = 'table_name';<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<h3>2. \u4f7f\u7528 ALTER TABLE \u8bed\u53e5<\/h3>\n<p>\u4e00\u65e6\u60a8\u77e5\u9053\u7ea6\u675f\u7684\u540d\u79f0\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528 ALTER TABLE \u8bed\u53e5\u5220\u9664\u5b83\uff1a<\/p>\n<pre>ALTER TABLE table_name\nDROP CONSTRAINT constraint_name;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8bf7\u786e\u4fdd\u7528\u60a8\u8981\u5220\u9664\u7684\u7ea6\u675f\u7684\u540d\u79f0\u66ff\u6362 constraint_name\u3002<\/p>\n<h3>3. \u786e\u8ba4\u5220\u9664<\/h3>\n<p>\u5220\u9664\u7ea6\u675f\u540e\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 information_schema.table_constraints \u8868\u518d\u6b21\u67e5\u8be2\u8868\u4fe1\u606f\uff0c\u4ee5\u786e\u8ba4\u8be5\u7ea6\u675f\u5df2\u5220\u9664\u3002<\/p>\n<h3>\u6ce8\u610f<\/h3>\n<ul>\n<li>\u5728\u5220\u9664\u7ea6\u675f\u4e4b\u524d\uff0c\u8bf7\u786e\u4fdd\u60a8\u5b8c\u5168\u7406\u89e3\u5bf9\u8868\u548c\u6570\u636e\u7684\u5f71\u54cd\u3002<\/li>\n<li>\u5982\u679c\u7ea6\u675f\u662f\u5916\u952e\u7ea6\u675f\uff0c\u5219\u5b83\u5728\u88ab\u5220\u9664\u8868\u4e2d\u88ab\u5f15\u7528\u7684\u5217\u4e5f\u9700\u8981\u66f4\u65b0\u6216\u5220\u9664\u3002<\/li>\n<li>\u5728\u67d0\u4e9b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e2d\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u6307\u5b9a\u7ea6\u675f\u7c7b\u578b\uff08\u4f8b\u5982 PRIMARY KEY \u6216 FOREIGN KEY\uff09\u4ee5\u5c06\u5176\u5220\u9664\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fsql\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 sql \u4e2d\u5220\u9664\u7ea6\u675f\uff0c\u8bf7\u6267\u884c\u4ee5\u4e0b\u6b65\u9aa4\uff1a\u8bc6\u522b\u8981\u5220\u9664\u7684\u7ea6\u675f\u540d\u79f0\uff1b\u4f7f\u7528 alter table \u8bed\u53e5\uff1aalter table \u8868\u540d drop constraint \u7ea6\u675f\u540d\uff1b\u786e\u8ba4\u5220\u9664\u3002 \u5982\u4f55\u5728 SQL \u4e2d\u5220\u9664\u7ea6\u675f SQL \u4e2d\u7684\u7ea6\u675f\u7528\u4e8e\u9650\u5236\u548c\u9a8c\u8bc1\u8868\u4e2d\u7684\u6570\u636e\u3002\u5982\u679c\u60a8\u9700\u8981\u4ece\u8868\u4e2d\u5220\u9664\u7ea6\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6b65\u9aa4\uff1a 1. \u6807\u8bc6\u8981\u5220\u9664\u7684\u7ea6\u675f \u9996\u5148\uff0c\u60a8\u9700\u8981\u6807\u8bc6\u8981\u5220\u9664\u7684\u7ea6\u675f\u7684\u540d\u79f0\u3002\u53ef\u4ee5\u901a\u8fc7\u67e5\u8be2\u8868\u4fe1\u606f\u6765\u83b7\u53d6\u6b64\u4fe1\u606f\uff1a SELECT constraint_name, constraint_type FROM information_schema.table_constraints WHERE table_name = &#8216;table_name&#8217;; \u767b\u5f55\u540e\u590d\u5236 2. \u4f7f\u7528 ALTER TABLE \u8bed\u53e5 \u4e00\u65e6\u60a8\u77e5\u9053\u7ea6\u675f\u7684\u540d\u79f0\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528 ALTER TABLE \u8bed\u53e5\u5220\u9664\u5b83\uff1a ALTER TABLE table_name DROP CONSTRAINT constraint_name; \u767b\u5f55\u540e\u590d\u5236 \u8bf7\u786e\u4fdd\u7528\u60a8\u8981\u5220\u9664\u7684\u7ea6\u675f\u7684\u540d\u79f0\u66ff\u6362 constraint_name\u3002 3. \u786e\u8ba4\u5220\u9664 \u5220\u9664\u7ea6\u675f\u540e\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 information_schema.table_constraints \u8868\u518d\u6b21\u67e5\u8be2\u8868\u4fe1\u606f\uff0c\u4ee5\u786e\u8ba4\u8be5\u7ea6\u675f\u5df2\u5220\u9664\u3002 \u6ce8\u610f \u5728\u5220\u9664\u7ea6\u675f\u4e4b\u524d\uff0c\u8bf7\u786e\u4fdd\u60a8\u5b8c\u5168\u7406\u89e3\u5bf9\u8868\u548c\u6570\u636e\u7684\u5f71\u54cd\u3002 \u5982\u679c\u7ea6\u675f\u662f\u5916\u952e\u7ea6\u675f\uff0c\u5219\u5b83\u5728\u88ab\u5220\u9664\u8868\u4e2d\u88ab\u5f15\u7528\u7684\u5217\u4e5f\u9700\u8981\u66f4\u65b0\u6216\u5220\u9664\u3002 [&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-5892","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5892","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=5892"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5892\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5892"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5892"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}