{"id":168485,"date":"2024-11-06T12:46:24","date_gmt":"2024-11-06T04:46:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168485\/"},"modified":"2024-11-06T12:46:25","modified_gmt":"2024-11-06T04:46:25","slug":"sql-%e7%b4%84%e6%9d%9f%e6%8e%a7%e5%88%b6%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168485\/","title":{"rendered":"SQL \u7d04\u675f\u63a7\u5236\u8a9e\u53e5"},"content":{"rendered":"<h1 id=\"sql-%e7%b4%84%e6%9d%9f%e6%8e%a7%e5%88%b6%e8%aa%9e%e5%8f%a5-ABAMxrpSrG\">SQL \u7d04\u675f\u63a7\u5236\u8a9e\u53e5<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u8cc7\u6599\u7684\u6a19\u6e96\u8a9e\u8a00\u3002SQL \u7d04\u675f\u63a7\u5236\u8a9e\u53e5\u662f\u7528\u4f86\u5b9a\u7fa9\u8cc7\u6599\u8868\u4e2d\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u91cd\u8981\u5de5\u5177\u3002\u9019\u4e9b\u7d04\u675f\u53ef\u4ee5\u78ba\u4fdd\u8cc7\u6599\u7684\u6b63\u78ba\u6027\uff0c\u9632\u6b62\u4e0d\u6b63\u78ba\u6216\u4e0d\u4e00\u81f4\u7684\u8cc7\u6599\u9032\u5165\u8cc7\u6599\u5eab\u3002\u672c\u6587\u5c07\u63a2\u8a0e SQL \u7d04\u675f\u63a7\u5236\u8a9e\u53e5\u7684\u985e\u578b\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e7%b4%84%e6%9d%9f%e7%9a%84%e9%a1%9e%e5%9e%8b-ABAMxrpSrG\">\u7d04\u675f\u7684\u985e\u578b<\/h2>\n<p>SQL \u4e2d\u7684\u7d04\u675f\u4e3b\u8981\u5206\u70ba\u4ee5\u4e0b\u5e7e\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>NOT NULL \u7d04\u675f<\/strong><\/li>\n<p>\u6b64\u7d04\u675f\u7528\u65bc\u78ba\u4fdd\u67d0\u500b\u6b04\u4f4d\u4e0d\u80fd\u70ba\u7a7a\u3002\u7576\u6211\u5011\u5e0c\u671b\u67d0\u500b\u6b04\u4f4d\u5fc5\u9808\u6709\u503c\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 NOT NULL \u7d04\u675f\u3002<\/p>\n<pre><code>CREATE TABLE \u54e1\u5de5 (\n        \u54e1\u5de5ID INT NOT NULL,\n        \u59d3\u540d VARCHAR(100) NOT NULL,\n        \u5e74\u9f61 INT\n    );<\/code><\/pre>\n<li><strong>UNIQUE \u7d04\u675f<\/strong><\/li>\n<p>UNIQUE \u7d04\u675f\u78ba\u4fdd\u67d0\u500b\u6b04\u4f4d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u9019\u610f\u5473\u8457\u4e0d\u6703\u6709\u91cd\u8907\u7684\u503c\u51fa\u73fe\u3002\u9019\u5728\u9700\u8981\u552f\u4e00\u8b58\u5225\u8cc7\u6599\u6642\u975e\u5e38\u6709\u7528\u3002<\/p>\n<pre><code>CREATE TABLE \u7528\u6236 (\n        \u7528\u6236ID INT NOT NULL UNIQUE,\n        \u96fb\u5b50\u90f5\u4ef6 VARCHAR(100) UNIQUE\n    );<\/code><\/pre>\n<li><strong>PRIMARY KEY \u7d04\u675f<\/strong><\/li>\n<p>PRIMARY KEY \u662f\u4e00\u7a2e\u7279\u6b8a\u7684 UNIQUE \u7d04\u675f\uff0c\u5b83\u4e0d\u50c5\u8981\u6c42\u6b04\u4f4d\u7684\u503c\u552f\u4e00\uff0c\u9084\u8981\u6c42\u8a72\u6b04\u4f4d\u4e0d\u80fd\u70ba\u7a7a\u3002\u901a\u5e38\u7528\u65bc\u552f\u4e00\u6a19\u8b58\u8cc7\u6599\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u3002<\/p>\n<pre><code>CREATE TABLE \u7522\u54c1 (\n        \u7522\u54c1ID INT PRIMARY KEY,\n        \u7522\u54c1\u540d\u7a31 VARCHAR(100) NOT NULL\n    );<\/code><\/pre>\n<li><strong>FOREIGN KEY \u7d04\u675f<\/strong><\/li>\n<p>FOREIGN KEY \u7d04\u675f\u7528\u65bc\u5efa\u7acb\u5169\u500b\u8cc7\u6599\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002\u5b83\u78ba\u4fdd\u5728\u4e00\u500b\u8cc7\u6599\u8868\u4e2d\u7684\u67d0\u500b\u6b04\u4f4d\u7684\u503c\u5fc5\u9808\u5b58\u5728\u65bc\u53e6\u4e00\u500b\u8cc7\u6599\u8868\u7684\u4e3b\u9375\u4e2d\u3002<\/p>\n<pre><code>CREATE TABLE \u8a02\u55ae (\n        \u8a02\u55aeID INT PRIMARY KEY,\n        \u7528\u6236ID INT,\n        FOREIGN KEY (\u7528\u6236ID) REFERENCES \u7528\u6236(\u7528\u6236ID)\n    );<\/code><\/pre>\n<li><strong>CHECK \u7d04\u675f<\/strong><\/li>\n<p>CHECK \u7d04\u675f\u7528\u65bc\u9650\u5236\u67d0\u500b\u6b04\u4f4d\u7684\u503c\u7bc4\u570d\u3002\u9019\u53ef\u4ee5\u7528\u4f86\u78ba\u4fdd\u8cc7\u6599\u7684\u6709\u6548\u6027\uff0c\u4f8b\u5982\u5e74\u9f61\u5fc5\u9808\u5728\u67d0\u500b\u7bc4\u570d\u5167\u3002<\/p>\n<pre><code>CREATE TABLE \u5b78\u751f (\n        \u5b78\u751fID INT PRIMARY KEY,\n        \u5e74\u9f61 INT CHECK (\u5e74\u9f61 &gt;= 0 AND \u5e74\u9f61 &lt;= 120)\n    );<\/code><\/pre>\n<li><strong>DEFAULT \u7d04\u675f<\/strong><\/li>\n<p>DEFAULT \u7d04\u675f\u7528\u65bc\u70ba\u67d0\u500b\u6b04\u4f4d\u6307\u5b9a\u9810\u8a2d\u503c\uff0c\u7576\u63d2\u5165\u8cc7\u6599\u6642\u5982\u679c\u8a72\u6b04\u4f4d\u6c92\u6709\u63d0\u4f9b\u503c\uff0c\u5247\u6703\u4f7f\u7528\u9810\u8a2d\u503c\u3002<\/p>\n<pre><code>CREATE TABLE \u6703\u54e1 (\n        \u6703\u54e1ID INT PRIMARY KEY,\n        \u8a3b\u518a\u65e5\u671f DATE DEFAULT CURRENT_DATE\n    );<\/code><\/pre>\n<\/ul>\n<h2 id=\"%e7%b4%84%e6%9d%9f%e7%9a%84%e4%bd%bf%e7%94%a8%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-ABAMxrpSrG\">\u7d04\u675f\u7684\u4f7f\u7528\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 SQL \u7d04\u675f\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5728\u8a2d\u8a08\u8cc7\u6599\u8868\u6642\uff0c\u61c9\u6839\u64da\u696d\u52d9\u9700\u6c42\u5408\u7406\u9078\u64c7\u7d04\u675f\u985e\u578b\uff0c\u4ee5\u78ba\u4fdd\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u3002<\/li>\n<li>\u904e\u591a\u7684\u7d04\u675f\u53ef\u80fd\u6703\u5f71\u97ff\u8cc7\u6599\u5eab\u7684\u6027\u80fd\uff0c\u56e0\u6b64\u61c9\u8b39\u614e\u4f7f\u7528\u3002<\/li>\n<li>\u5728\u4fee\u6539\u8cc7\u6599\u8868\u7d50\u69cb\u6642\uff0c\u9700\u8003\u616e\u5230\u73fe\u6709\u8cc7\u6599\u7684\u5b8c\u6574\u6027\uff0c\u907f\u514d\u56e0\u7d04\u675f\u7684\u8b8a\u66f4\u5c0e\u81f4\u8cc7\u6599\u4e0d\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ABAMxrpSrG\">\u7e3d\u7d50<\/h2>\n<p>SQL \u7d04\u675f\u63a7\u5236\u8a9e\u53e5\u662f\u78ba\u4fdd\u8cc7\u6599\u5eab\u8cc7\u6599\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u95dc\u9375\u5de5\u5177\u3002\u900f\u904e\u5408\u7406\u4f7f\u7528 NOT NULL\u3001UNIQUE\u3001PRIMARY KEY\u3001FOREIGN KEY\u3001CHECK \u548c DEFAULT \u7b49\u7d04\u675f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u8cc7\u6599\u7684\u6709\u6548\u6027\u548c\u6b63\u78ba\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u548c\u7a69\u5b9a\u6027\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u4e86\u89e3 SQL \u7d04\u675f\u7684\u4f7f\u7528\uff0c\u5c07\u6709\u52a9\u65bc\u958b\u767c\u66f4\u5065\u58ef\u7684\u8cc7\u6599\u5eab\u61c9\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3SQL\u7d04\u675f\u63a7\u5236\u8a9e\u53e5\uff0c\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528\u7d04\u675f\u4f86\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6548\u7387\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-168485","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168485","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=168485"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168485\/revisions"}],"predecessor-version":[{"id":168486,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168485\/revisions\/168486"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168485"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168485"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168485"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}