{"id":168457,"date":"2024-11-06T12:32:28","date_gmt":"2024-11-06T04:32:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168457\/"},"modified":"2024-11-06T12:32:29","modified_gmt":"2024-11-06T04:32:29","slug":"sql-%e8%aa%9e%e5%8f%a5%e8%a8%ad%e7%bd%ae%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e4%b8%bb%e9%8d%b5-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e7%bd%ae%e4%b8%bb%e9%8d%b5%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168457\/","title":{"rendered":"SQL \u8a9e\u53e5\u8a2d\u7f6e\u6578\u64da\u5eab\u7684\u4e3b\u9375 (\u6578\u64da\u5eab\u8a2d\u7f6e\u4e3b\u9375\u7684 sql \u8a9e\u53e5)"},"content":{"rendered":"<h1 id=\"sql-%e8%aa%9e%e5%8f%a5%e8%a8%ad%e7%bd%ae%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e4%b8%bb%e9%8d%b5-SWJdruHsdN\">SQL \u8a9e\u53e5\u8a2d\u7f6e\u6578\u64da\u5eab\u7684\u4e3b\u9375<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u4e3b\u9375\uff08Primary Key\uff09\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6982\u5ff5\u3002\u4e3b\u9375\u7528\u65bc\u552f\u4e00\u6a19\u8b58\u6578\u64da\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u6578\u64da\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u8a2d\u7f6e\u6578\u64da\u5eab\u7684\u4e3b\u9375\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e4%b8%bb%e9%8d%b5%ef%bc%9f-SWJdruHsdN\">\u4ec0\u9ebc\u662f\u4e3b\u9375\uff1f<\/h2>\n<p>\u4e3b\u9375\u662f\u4e00\u500b\u6216\u591a\u500b\u5217\u7684\u7d44\u5408\uff0c\u5176\u503c\u5728\u6578\u64da\u8868\u4e2d\u5fc5\u9808\u662f\u552f\u4e00\u7684\uff0c\u4e26\u4e14\u4e0d\u80fd\u70ba\u7a7a\u3002\u4e3b\u9375\u7684\u4e3b\u8981\u529f\u80fd\u662f\u78ba\u4fdd\u6bcf\u4e00\u884c\u6578\u64da\u7684\u552f\u4e00\u6027\uff0c\u9019\u5c0d\u65bc\u6578\u64da\u7684\u6aa2\u7d22\u548c\u95dc\u806f\u81f3\u95dc\u91cd\u8981\u3002\u8a2d\u7f6e\u4e3b\u9375\u5f8c\uff0c\u6578\u64da\u5eab\u7cfb\u7d71\u6703\u81ea\u52d5\u70ba\u8a72\u5217\u5275\u5efa\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e8%a8%ad%e7%bd%ae%e4%b8%bb%e9%8d%b5%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5-SWJdruHsdN\">\u8a2d\u7f6e\u4e3b\u9375\u7684 SQL \u8a9e\u53e5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u5728\u5275\u5efa\u8868\u6642\u6216\u5728\u8868\u5275\u5efa\u5f8c\u4f7f\u7528 ALTER TABLE \u8a9e\u53e5\u4f86\u8a2d\u7f6e\u4e3b\u9375\u3002\u4ee5\u4e0b\u662f\u5169\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e5%9c%a8%e5%89%b5%e5%bb%ba%e8%a1%a8%e6%99%82%e8%a8%ad%e7%bd%ae%e4%b8%bb%e9%8d%b5-SWJdruHsdN\">1. \u5728\u5275\u5efa\u8868\u6642\u8a2d\u7f6e\u4e3b\u9375<\/h3>\n<pre><code>CREATE TABLE users (\n    user_id INT NOT NULL,\n    username VARCHAR(50) NOT NULL,\n    email VARCHAR(100),\n    PRIMARY KEY (user_id)\n);<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u8868\uff0c\u4e26\u5c07 <code>user_id<\/code> \u5217\u8a2d\u7f6e\u70ba\u4e3b\u9375\u3002\u9019\u610f\u5473\u8457\u6bcf\u500b\u7528\u6236\u7684 <code>user_id<\/code> \u5fc5\u9808\u662f\u552f\u4e00\u7684\uff0c\u4e14\u4e0d\u80fd\u70ba\u7a7a\u3002<\/p>\n<h3 id=\"2-%e5%9c%a8%e5%b7%b2%e5%ad%98%e5%9c%a8%e7%9a%84%e8%a1%a8%e4%b8%ad%e8%a8%ad%e7%bd%ae%e4%b8%bb%e9%8d%b5-SWJdruHsdN\">2. \u5728\u5df2\u5b58\u5728\u7684\u8868\u4e2d\u8a2d\u7f6e\u4e3b\u9375<\/h3>\n<p>\u5982\u679c\u8868\u5df2\u7d93\u5b58\u5728\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u4f86\u6dfb\u52a0\u4e3b\u9375\uff1a<\/p>\n<pre><code>ALTER TABLE users\nADD PRIMARY KEY (user_id);<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07 <code>user_id<\/code> \u5217\u8a2d\u7f6e\u70ba <code>users<\/code> \u8868\u7684\u4e3b\u9375\u3002\u5982\u679c\u8a72\u5217\u4e2d\u5df2\u7d93\u5b58\u5728\u91cd\u8907\u7684\u503c\uff0c\u5247\u6703\u5831\u932f\u3002<\/p>\n<h2 id=\"%e5%a4%9a%e5%88%97%e4%b8%bb%e9%8d%b5-SWJdruHsdN\">\u591a\u5217\u4e3b\u9375<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u591a\u5217\u4f5c\u70ba\u4e3b\u9375\u3002\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u53ef\u4ee5\u5728\u5275\u5efa\u8868\u6642\u6216\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u4f86\u8a2d\u7f6e\u591a\u5217\u4e3b\u9375\uff1a<\/p>\n<pre><code>CREATE TABLE orders (\n    order_id INT NOT NULL,\n    product_id INT NOT NULL,\n    user_id INT NOT NULL,\n    PRIMARY KEY (order_id, product_id)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>order_id<\/code> \u548c <code>product_id<\/code> \u7684\u7d44\u5408\u5c07\u4f5c\u70ba <code>orders<\/code> \u8868\u7684\u4e3b\u9375\uff0c\u9019\u610f\u5473\u8457\u540c\u4e00\u500b\u8a02\u55ae\u4e2d\u53ef\u4ee5\u6709\u591a\u500b\u7522\u54c1\uff0c\u4f46\u6bcf\u500b\u7522\u54c1\u5728\u540c\u4e00\u8a02\u55ae\u4e2d\u5fc5\u9808\u662f\u552f\u4e00\u7684\u3002<\/p>\n<h2 id=\"%e4%b8%bb%e9%8d%b5%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-SWJdruHsdN\">\u4e3b\u9375\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u4e3b\u9375\u5217\u7684\u6578\u64da\u985e\u578b\u61c9\u8a72\u662f\u4e0d\u53ef\u8b8a\u7684\uff0c\u907f\u514d\u983b\u7e41\u66f4\u65b0\u3002<\/li>\n<li>\u4e3b\u9375\u4e0d\u61c9\u8a72\u5305\u542b\u654f\u611f\u4fe1\u606f\uff0c\u5982\u793e\u6703\u5b89\u5168\u865f\u78bc\u6216\u4fe1\u7528\u5361\u865f\u3002<\/li>\n<li>\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u61c9\u8a72\u8003\u616e\u5230\u672a\u4f86\u7684\u64f4\u5c55\u6027\uff0c\u9078\u64c7\u5408\u9069\u7684\u5217\u4f5c\u70ba\u4e3b\u9375\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-SWJdruHsdN\">\u7e3d\u7d50<\/h2>\n<p>\u8a2d\u7f6e\u4e3b\u9375\u662f\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u6b65\u9a5f\uff0c\u5b83\u6709\u52a9\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u552f\u4e00\u6027\u3002\u7121\u8ad6\u662f\u5728\u5275\u5efa\u8868\u6642\u9084\u662f\u5728\u8868\u5275\u5efa\u5f8c\uff0c\u4f7f\u7528\u6b63\u78ba\u7684 SQL \u8a9e\u53e5\u90fd\u80fd\u6709\u6548\u5730\u8a2d\u7f6e\u4e3b\u9375\u3002\u4e86\u89e3\u5982\u4f55\u6b63\u78ba\u8a2d\u7f6e\u4e3b\u9375\uff0c\u5c0d\u65bc\u4efb\u4f55\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u6216\u958b\u767c\u8005\u4f86\u8aaa\u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u6280\u80fd\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f <a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u8a2d\u7f6e\u6578\u64da\u5eab\u7684\u4e3b\u9375\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\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-168457","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168457","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=168457"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168457\/revisions"}],"predecessor-version":[{"id":168458,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168457\/revisions\/168458"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}