{"id":5238,"date":"2024-11-14T10:00:56","date_gmt":"2024-11-14T02:00:56","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5238\/"},"modified":"2024-11-14T10:00:56","modified_gmt":"2024-11-14T02:00:56","slug":"mysql%e8%81%94%e5%90%88%e4%b8%bb%e9%94%ae%e6%80%8e%e4%b9%88%e8%ae%be%e7%bd%ae","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5238\/","title":{"rendered":"mysql\u8054\u5408\u4e3b\u952e\u600e\u4e48\u8bbe\u7f6e"},"content":{"rendered":"<blockquote><p>\n  \u8054\u5408\u4e3b\u952e\u901a\u8fc7\u4f7f\u7528\u591a\u4e2a\u5217\u540c\u65f6\u4f5c\u4e3a\u4e3b\u952e\u6765\u4fdd\u8bc1\u6570\u636e\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\u3002\u8bbe\u7f6e\u65b9\u6cd5\u5305\u62ec\uff1a\u5728\u521b\u5efa\u8868\u65f6\u4f7f\u7528 primary key (column1, column2)\uff1b\u6216\u5728\u73b0\u6709\u8868\u4e2d\u4f7f\u7528 alter table add primary key (column1, column2)\u3002\u8054\u5408\u4e3b\u952e\u4e2d\u7684\u5217\u5fc5\u987b\u975e\u7a7a\u4e14\u552f\u4e00\uff0c\u987a\u5e8f\u5f88\u91cd\u8981\uff0c\u957f\u5ea6\u5e94\u4fdd\u6301\u8f83\u77ed\u4ee5\u63d0\u5347\u6027\u80fd\u3002\u521b\u5efa\u540e\uff0c\u4e0d\u53ef\u4fee\u6539\u4e3b\u952e\u503c\uff0c\u5220\u9664\u8054\u5408\u4e3b\u952e\u4f7f\u7528 drop primary key \u5b50\u53e5\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/26\/2024052617154818714.jpg\" class=\"aligncenter\" title=\"mysql\u8054\u5408\u4e3b\u952e\u600e\u4e48\u8bbe\u7f6e\u63d2\u56fe\" alt=\"mysql\u8054\u5408\u4e3b\u952e\u600e\u4e48\u8bbe\u7f6e\u63d2\u56fe\" \/><\/p>\n<p><strong>MySQL\u8054\u5408\u4e3b\u952e\u8bbe\u7f6e\u65b9\u6cd5<\/strong><\/p>\n<p>\u8054\u5408\u4e3b\u952e\u662f\u5728\u540c\u4e00\u5f20\u8868\u4e2d\u540c\u65f6\u4f7f\u7528\u591a\u4e2a\u5217\u4f5c\u4e3a\u4e3b\u952e\u3002\u8054\u5408\u4e3b\u952e\u7684\u597d\u5904\u662f\u53ef\u4ee5\u4fdd\u8bc1\u8868\u4e2d\u6570\u636e\u7684\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n<p><strong>\u8bbe\u7f6e\u8054\u5408\u4e3b\u952e\u7684\u6b65\u9aa4\uff1a<\/strong><\/p>\n<ol>\n<li><strong>\u5728CREATE TABLE\u8bed\u53e5\u4e2d\u4f7f\u7528PRIMARY KEY\u5173\u952e\u5b57\uff1a<\/strong><\/li>\n<\/ol>\n<pre>CREATE TABLE table_name (\n  column1 datatype NOT NULL,\n  column2 datatype NOT NULL,\n  PRIMARY KEY (column1, column2)\n);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<ol>\n<li><strong>\u4f7f\u7528ALTER TABLE\u8bed\u53e5\u4fee\u6539\u73b0\u6709\u8868\uff1a<\/strong><\/li>\n<\/ol>\n<pre>ALTER TABLE table_name ADD PRIMARY KEY (column1, column2);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n<ul>\n<li>\u8054\u5408\u4e3b\u952e\u4e2d\u5305\u542b\u7684\u5217\u5fc5\u987b\u90fd\u662f\u975e\u7a7a\u4e14\u552f\u4e00\u7684\u3002<\/li>\n<li>\u8054\u5408\u4e3b\u952e\u7684\u987a\u5e8f\u5f88\u91cd\u8981\u3002<\/li>\n<li>\u8054\u5408\u4e3b\u952e\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u5217\uff0c\u4f46\u901a\u5e38\u5efa\u8bae\u4fdd\u6301\u8f83\u77ed\u7684\u957f\u5ea6\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li>\u521b\u5efa\u8054\u5408\u4e3b\u952e\u540e\uff0c\u4e0d\u80fd\u4f7f\u7528UPDATE\u6216DELETE\u8bed\u53e5\u4fee\u6539\u4e3b\u952e\u7684\u503c\u3002<\/li>\n<li>\u5982\u679c\u9700\u8981\u5220\u9664\u8054\u5408\u4e3b\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE\u8bed\u53e5\u4e2d\u7684DROP PRIMARY KEY\u5b50\u53e5\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u8054\u5408\u4e3b\u952e\u600e\u4e48\u8bbe\u7f6e\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>\u8054\u5408\u4e3b\u952e\u901a\u8fc7\u4f7f\u7528\u591a\u4e2a\u5217\u540c\u65f6\u4f5c\u4e3a\u4e3b\u952e\u6765\u4fdd\u8bc1\u6570\u636e\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\u3002\u8bbe\u7f6e\u65b9\u6cd5\u5305\u62ec\uff1a\u5728\u521b\u5efa\u8868\u65f6\u4f7f\u7528 primary key (column1, column2)\uff1b\u6216\u5728\u73b0\u6709\u8868\u4e2d\u4f7f\u7528 alter table add primary key (column1, column2)\u3002\u8054\u5408\u4e3b\u952e\u4e2d\u7684\u5217\u5fc5\u987b\u975e\u7a7a\u4e14\u552f\u4e00\uff0c\u987a\u5e8f\u5f88\u91cd\u8981\uff0c\u957f\u5ea6\u5e94\u4fdd\u6301\u8f83\u77ed\u4ee5\u63d0\u5347\u6027\u80fd\u3002\u521b\u5efa\u540e\uff0c\u4e0d\u53ef\u4fee\u6539\u4e3b\u952e\u503c\uff0c\u5220\u9664\u8054\u5408\u4e3b\u952e\u4f7f\u7528 drop primary key \u5b50\u53e5\u3002 MySQL\u8054\u5408\u4e3b\u952e\u8bbe\u7f6e\u65b9\u6cd5 \u8054\u5408\u4e3b\u952e\u662f\u5728\u540c\u4e00\u5f20\u8868\u4e2d\u540c\u65f6\u4f7f\u7528\u591a\u4e2a\u5217\u4f5c\u4e3a\u4e3b\u952e\u3002\u8054\u5408\u4e3b\u952e\u7684\u597d\u5904\u662f\u53ef\u4ee5\u4fdd\u8bc1\u8868\u4e2d\u6570\u636e\u7684\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\u3002 \u8bbe\u7f6e\u8054\u5408\u4e3b\u952e\u7684\u6b65\u9aa4\uff1a \u5728CREATE TABLE\u8bed\u53e5\u4e2d\u4f7f\u7528PRIMARY KEY\u5173\u952e\u5b57\uff1a CREATE TABLE table_name ( column1 datatype NOT NULL, column2 datatype NOT NULL, PRIMARY KEY (column1, column2) ); \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528ALTER TABLE\u8bed\u53e5\u4fee\u6539\u73b0\u6709\u8868\uff1a ALTER TABLE table_name ADD PRIMARY KEY (column1, column2); \u767b\u5f55\u540e\u590d\u5236 \u6ce8\u610f\u4e8b\u9879\uff1a \u8054\u5408\u4e3b\u952e\u4e2d\u5305\u542b\u7684\u5217\u5fc5\u987b\u90fd\u662f\u975e\u7a7a\u4e14\u552f\u4e00\u7684\u3002 \u8054\u5408\u4e3b\u952e\u7684\u987a\u5e8f\u5f88\u91cd\u8981\u3002 \u8054\u5408\u4e3b\u952e\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u5217\uff0c\u4f46\u901a\u5e38\u5efa\u8bae\u4fdd\u6301\u8f83\u77ed\u7684\u957f\u5ea6\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\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-5238","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5238","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=5238"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5238\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}