{"id":1566,"date":"2025-05-07T20:07:16","date_gmt":"2025-05-07T12:07:16","guid":{"rendered":"https:\/\/www.ddosidc.com\/wp\/?p=1566"},"modified":"2025-05-07T20:07:16","modified_gmt":"2025-05-07T12:07:16","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8sql%e4%b8%ad%e6%9c%89%e6%95%88%e8%ae%be%e7%bd%ae%e4%b8%bb%e9%94%ae%e7%a1%ae%e4%bf%9d%e6%95%b0%e6%8d%ae%e5%94%af%e4%b8%80%e6%80%a7%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.ddosidc.com\/wp\/1566.html","title":{"rendered":"\u5982\u4f55\u5728SQL\u4e2d\u6709\u6548\u8bbe\u7f6e\u4e3b\u952e\u786e\u4fdd\u6570\u636e\u552f\u4e00\u6027\uff1f"},"content":{"rendered":"<p><p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/www.ddosidc.com\/wp\/wp-content\/uploads\/2025\/05\/ZT0Y7s.jpg\" alt=\"\u5982\u4f55\u5728SQL\u4e2d\u6709\u6548\u8bbe\u7f6e\u4e3b\u952e\u786e\u4fdd\u6570\u636e\u552f\u4e00\u6027\uff1f\" title=\"\u5982\u4f55\u5728SQL\u4e2d\u6709\u6548\u8bbe\u7f6e\u4e3b\u952e\u786e\u4fdd\u6570\u636e\u552f\u4e00\u6027\uff1f\"><\/p>\n<p><h3>1. \u5982\u4f55\u8bbe\u7f6e\u4e3b\u952e<\/h3>\n<\/p>\n<p>\u5728SQL\u4e2d\uff0c\u8bbe\u7f6e\u4e3b\u952e\u662f\u901a\u8fc7\u5728\u521b\u5efa\u8868\u6216\u4fee\u6539\u8868\u7ed3\u6784\u65f6\u4f7f\u7528PRIMARY KEY\u7ea6\u675f\u5b9e\u73b0\u7684\u3002\u4e3b\u952e\u662f\u7528\u4e8e\u552f\u4e00\u6807\u8bc6\u8868\u4e2d\u6bcf\u4e00\u884c\u7684\u6570\u636e\uff0c\u786e\u4fdd\u6bcf\u4e00\u884c\u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u7684\u6807\u8bc6\u7b26\u3002\u60a8\u53ef\u4ee5\u5728\u521b\u5efa\u8868\u65f6\u76f4\u63a5\u6307\u5b9a\u67d0\u4e00\u5217\u4f5c\u4e3a\u4e3b\u952e\uff0c\u6216\u8005\u5728\u8868\u521b\u5efa\u540e\u901a\u8fc7ALTER\u8bed\u53e5\u6dfb\u52a0\u3002<\/p>\n<\/p>\n<p>\n<h3>2. \u4e3b\u952e\u7684\u6570\u91cf<\/h3>\n<\/p>\n<p>\u5728\u4e00\u5f20\u8868\u4e2d\uff0c\u60a8\u53ea\u80fd\u8bbe\u7f6e\u4e00\u4e2a\u4e3b\u952e\uff0c\u4f46\u8fd9\u4e2a\u4e3b\u952e\u53ef\u4ee5\u7531\u4e00\u4e2a\u6216\u591a\u4e2a\u5217\u7ec4\u5408\u800c\u6210\u3002\u5373\uff0c\u4e3b\u952e\u53ef\u4ee5\u662f\u5355\u5217\u4e3b\u952e\u6216\u590d\u5408\u4e3b\u952e\u3002\u590d\u5408\u4e3b\u952e\u7684\u60c5\u51b5\u9002\u7528\u4e8e\u90a3\u4e9b\u5355\u72ec\u5217\u4e0d\u80fd\u552f\u4e00\u6807\u8bc6\u67d0\u6761\u8bb0\u5f55\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n<p>\n<h3>3. \u8bbe\u7f6e\u4e3b\u952e\u7684\u793a\u4f8b<\/h3>\n<\/p>\n<p>\u5047\u8bbe\u60a8\u8981\u521b\u5efa\u4e00\u4e2a\u7528\u6237\u4fe1\u606f\u8868\uff0c\u5176\u4e2dID\u5b57\u6bb5\u4f5c\u4e3a\u4e3b\u952e\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u7684SQL\u547d\u4ee4\uff1a<\/p>\n<p><pre><code>CREATE TABLE Users (<\/p>\r\n<p>    ID INT NOT NULL,<\/p>\r\n<p>    UserName VARCHAR(50),<\/p>\r\n<p>    Email VARCHAR(100),<\/p>\r\n<p>    PRIMARY KEY (ID)<\/p>\r\n<p>);<\/code><\/pre>\n<\/p>\n<p>\u5982\u679c\u60a8\u5e0c\u671b\u5c06UserName\u548cEmail\u7ec4\u5408\u6210\u4e00\u4e2a\u590d\u5408\u4e3b\u952e\uff0c\u53ef\u4ee5\u8fd9\u6837\u8bbe\u7f6e\uff1a<\/p>\n<p><pre><code>CREATE TABLE Users (<\/p>\r\n<p>    UserName VARCHAR(50),<\/p>\r\n<p>    Email VARCHAR(100),<\/p>\r\n<p>    PRIMARY KEY (UserName, Email)<\/p>\r\n<p>);<\/code><\/pre>\n<\/p>\n<p>\n<h3>4. \u4f55\u65f6\u8bbe\u7f6e\u4e3b\u952e<\/h3>\n<\/p>\n<p>\u5efa\u8bae\u60a8\u5728\u8868\u7ed3\u6784\u8bbe\u8ba1\u7684\u521d\u671f\u9636\u6bb5\u5c31\u8bbe\u7f6e\u4e3b\u952e\u3002\u4e3b\u952e\u7684\u5b58\u5728\u53ef\u4ee5\u63d0\u9ad8\u68c0\u7d22\u6548\u7387\uff0c\u786e\u4fdd\u6570\u636e\u7684\u552f\u4e00\u6027\uff0c\u5e76\u4fc3\u8fdb\u6570\u636e\u4e4b\u95f4\u7684\u5173\u7cfb\u7ed1\u5b9a\u3002\u968f\u7740\u6570\u636e\u5e93\u7684\u53d1\u5c55\uff0c\u9002\u65f6\u6dfb\u52a0\u4e3b\u952e\u53ef\u4ee5\u6709\u6548\u964d\u4f4e\u540e\u671f\u4fee\u6539\u5e26\u6765\u7684\u590d\u6742\u6027\u548c\u98ce\u9669\u3002<\/p>\n<\/p>\n<p>\n<h3>5. \u4e3a\u4ec0\u4e48\u5efa\u8bae\u4f7f\u7528\u4e3b\u952e<\/h3>\n<\/p>\n<p>\u4f7f\u7528\u4e3b\u952e\u7684\u4e3b\u8981\u539f\u56e0\u662f\u5b83\u4eec\u53ef\u4ee5\u786e\u4fdd\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u662f\u552f\u4e00\u7684\uff0c\u80fd\u591f\u907f\u514d\u6570\u636e\u91cd\u590d\u3002\u4e3b\u952e\u4e5f\u8d77\u5230\u6570\u636e\u5b8c\u6574\u6027\u7684\u4fdd\u62a4\u4f5c\u7528\uff0c\u6709\u52a9\u4e8e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u6b63\u5e38\u8fd0\u884c\uff0c\u786e\u4fdd\u6570\u636e\u7684\u53ef\u9760\u6027\u548c\u4e00\u81f4\u6027\u3002\u6b64\u5916\uff0c\u901a\u8fc7\u8bbe\u7f6e\u4e3b\u952e\uff0c\u6570\u636e\u5e93\u5728\u6267\u884c\u67e5\u8be2\u64cd\u4f5c\u65f6\u4f1a\u66f4\u6709\u6548\u7387\uff0c\u51cf\u5c11\u68c0\u7d22\u65f6\u95f4\u3002<\/p>\n<\/p>\n<p>\n<h3>6. <b>\u4ec0\u4e48\u662f\u4e3b\u952e\u7684\u4f5c\u7528\uff1f<\/b><\/h3>\n<\/p>\n<p>\u4e3b\u952e\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u552f\u4e00\u6807\u8bc6\u8868\u4e2d\u7684\u6bcf\u4e00\u6761\u8bb0\u5f55\uff0c\u907f\u514d\u51fa\u73b0\u91cd\u590d\u6570\u636e\u3002\u5b83\u8fd8\u53ef\u4ee5\u4f5c\u4e3a\u5916\u952e\u4e0e\u5176\u4ed6\u8868\u5efa\u7acb\u8054\u7cfb\uff0c\u5b9e\u73b0\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u903b\u8f91\u5173\u7cfb\uff08\u5982\u4e00\u5bf9\u4e00\u3001\u4e00\u5bf9\u591a\u7b49\uff09\u3002<\/p>\n<\/p>\n<p>\n<h3>7. <b>\u4e3b\u952e\u548c\u7d22\u5f15\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/b><\/h3>\n<\/p>\n<p>\u4e3b\u952e\u662f\u6570\u636e\u5e93\u8868\u4e2d\u7684\u4e00\u4e2a\u7ea6\u675f\u6761\u4ef6\uff0c\u786e\u4fdd\u6bcf\u4e00\u6761\u8bb0\u5f55\u7684\u552f\u4e00\u6027\u3002\u800c\u7d22\u5f15\u5219\u662f\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6\u7684\u4e00\u79cd\u673a\u5236\u3002\u867d\u7136\u4e3b\u952e\u81ea\u52a8\u521b\u5efa\u4e86\u4e00\u4e2a\u552f\u4e00\u7d22\u5f15\uff0c\u4f46\u7d22\u5f15\u4e0d\u4ec5\u9650\u4e8e\u4e3b\u952e\uff0c\u5b83\u53ef\u4ee5\u5728\u4efb\u610f\u5217\u4e0a\u521b\u5efa\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<\/p>\n<p>\n<h3>8. <b>\u5982\u679c\u6211\u5df2\u7ecf\u6709\u6570\u636e\uff0c\u8be5\u5982\u4f55\u6dfb\u52a0\u4e3b\u952e\uff1f<\/b><\/h3>\n<\/p>\n<p>\u5982\u679c\u60a8\u5df2\u7ecf\u6709\u6570\u636e\u5e76\u5e0c\u671b\u6dfb\u52a0\u4e3b\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE\u8bed\u53e5\u3002\u9996\u5148\u8981\u786e\u4fdd\u73b0\u6709\u6570\u636e\u7684\u552f\u4e00\u6027\uff0c\u4e0d\u7136\u65e0\u6cd5\u6210\u529f\u8bbe\u7f6e\u4e3b\u952e\u3002\u4f8b\u5982\uff1a<\/p>\n<p><pre><code>ALTER TABLE Users ADD PRIMARY KEY (ID);<\/code><\/pre>\n<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4efb\u4f55\u5c1d\u8bd5\u5c06\u6570\u636e\u8bbe\u4e3a\u4e3b\u952e\u7684\u5217\u5fc5\u987b\u786e\u4fdd\u65e0\u7a7a\u503c\u5e76\u4e14\u6bcf\u4e00\u503c\u90fd\u4e0d\u91cd\u590d\u3002<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. \u5982\u4f55\u8bbe\u7f6e\u4e3b\u952e \u5728SQL\u4e2d\uff0c\u8bbe\u7f6e\u4e3b\u952e\u662f\u901a\u8fc7\u5728\u521b\u5efa\u8868\u6216\u4fee\u6539\u8868\u7ed3\u6784\u65f6\u4f7f\u7528PRIMARY KEY\u7ea6\u675f\u5b9e\u73b0\u7684\u3002\u4e3b\u952e\u662f\u7528\u4e8e\u552f\u4e00\u6807\u8bc6\u8868\u4e2d\u6bcf\u4e00\u884c\u7684\u6570\u636e\uff0c\u786e\u4fdd\u6bcf\u4e00\u884c\u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u7684\u6807\u8bc6\u7b26\u3002\u60a8\u53ef\u4ee5\u5728\u521b\u5efa\u8868\u65f6\u76f4\u63a5\u6307\u5b9a\u67d0\u4e00\u5217\u4f5c\u4e3a\u4e3b\u952e\uff0c\u6216\u8005\u5728\u8868\u521b\u5efa\u540e\u901a\u8fc7ALTE&#8230;<\/p>\n","protected":false},"author":1,"featured_media":1567,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"topic":[],"class_list":["post-1566","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-baike"],"_links":{"self":[{"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/posts\/1566","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/comments?post=1566"}],"version-history":[{"count":1,"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/posts\/1566\/revisions"}],"predecessor-version":[{"id":1569,"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/posts\/1566\/revisions\/1569"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/media\/1567"}],"wp:attachment":[{"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/media?parent=1566"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/categories?post=1566"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/tags?post=1566"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.ddosidc.com\/wp\/wp-json\/wp\/v2\/topic?post=1566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}