{"id":179800,"date":"2024-11-09T04:54:16","date_gmt":"2024-11-08T20:54:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179800\/"},"modified":"2024-11-09T04:54:16","modified_gmt":"2024-11-08T20:54:16","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e5%bb%ba%e8%a1%a8%e6%99%82%e9%80%b2%e8%a1%8c%e6%8e%92%e5%ba%8f%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%bb%ba%e8%a1%a8%e7%9a%84%e6%99%82%e5%80%99","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179800\/","title":{"rendered":"\u5982\u4f55\u5728\u6578\u64da\u5eab\u5efa\u8868\u6642\u9032\u884c\u6392\u5e8f\uff1f (\u6578\u64da\u5eab\u5efa\u8868\u7684\u6642\u5019\u6392\u5e8f)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e5%bb%ba%e8%a1%a8%e6%99%82%e9%80%b2%e8%a1%8c%e6%8e%92%e5%ba%8f%ef%bc%9f-emNFVZDVTD\">\u5982\u4f55\u5728\u6578\u64da\u5eab\u5efa\u8868\u6642\u9032\u884c\u6392\u5e8f\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u5efa\u8868\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6b65\u9a5f\u3002\u7576\u6211\u5011\u5275\u5efa\u4e00\u500b\u6578\u64da\u8868\u6642\uff0c\u9664\u4e86\u5b9a\u7fa9\u8868\u7684\u7d50\u69cb\u548c\u6578\u64da\u985e\u578b\u5916\uff0c\u6392\u5e8f\u4e5f\u662f\u4e00\u500b\u9700\u8981\u8003\u616e\u7684\u56e0\u7d20\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728\u6578\u64da\u5eab\u5efa\u8868\u6642\u5982\u4f55\u9032\u884c\u6392\u5e8f\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u5efa\u8b70\u3002<\/p>\n<h2 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id=\"%e5%bb%ba%e8%a1%a8%e6%99%82%e7%9a%84%e6%8e%92%e5%ba%8f%e8%80%83%e9%87%8f-emNFVZDVTD\">\u5efa\u8868\u6642\u7684\u6392\u5e8f\u8003\u91cf<\/h2>\n<p>\u5728\u5275\u5efa\u6578\u64da\u8868\u6642\uff0c\u96d6\u7136\u4e0d\u80fd\u76f4\u63a5\u5728\u5efa\u8868\u8a9e\u53e5\u4e2d\u6307\u5b9a\u6578\u64da\u7684\u6392\u5e8f\u65b9\u5f0f\uff0c\u4f46\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u5f0f\u4f86\u5f71\u97ff\u672a\u4f86\u7684\u6392\u5e8f\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li><strong>\u9078\u64c7\u5408\u9069\u7684\u4e3b\u9375\uff1a<\/strong>\u4e3b\u9375\u662f\u8868\u4e2d\u552f\u4e00\u6a19\u8b58\u6bcf\u4e00\u884c\u7684\u5217\uff0c\u901a\u5e38\u6703\u81ea\u52d5\u9032\u884c\u6392\u5e8f\u3002\u9078\u64c7\u4e00\u500b\u5408\u9069\u7684\u4e3b\u9375\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li><strong>\u4f7f\u7528\u7d22\u5f15\uff1a<\/strong>\u5728\u9700\u8981\u6392\u5e8f\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u52a0\u5feb\u6392\u5e8f\u64cd\u4f5c\u7684\u901f\u5ea6\u3002\u7d22\u5f15\u53ef\u4ee5\u662f\u55ae\u5217\u7d22\u5f15\u6216\u591a\u5217\u7d22\u5f15\u3002<\/li>\n<li><strong>\u8003\u616e\u6578\u64da\u985e\u578b\uff1a<\/strong>\u4e0d\u540c\u7684\u6578\u64da\u985e\u578b\u5728\u6392\u5e8f\u6642\u7684\u6027\u80fd\u8868\u73fe\u4e0d\u540c\u3002\u4f8b\u5982\uff0c\u6574\u6578\u985e\u578b\u7684\u6392\u5e8f\u901a\u5e38\u6bd4\u5b57\u7b26\u4e32\u985e\u578b\u7684\u6392\u5e8f\u66f4\u5feb\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e8%a1%a8%e4%b8%a6%e8%80%83%e6%85%ae%e6%8e%92%e5%ba%8f-emNFVZDVTD\">\u793a\u4f8b\uff1a\u5275\u5efa\u8868\u4e26\u8003\u616e\u6392\u5e8f<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728\u5275\u5efa\u8868\u6642\u8003\u616e\u6392\u5e8f\u7684\u56e0\u7d20\uff1a<\/p>\n<pre><code>CREATE TABLE Employees (\n    EmployeeID INT PRIMARY KEY,\n    LastName VARCHAR(50),\n    FirstName VARCHAR(50),\n    HireDate DATE,\n    Salary DECIMAL(10, 2),\n    INDEX idx_lastname (LastName)\n);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba Employees \u7684\u8868\uff0c\u4e26\u8a2d\u7f6e\u4e86 EmployeeID \u70ba\u4e3b\u9375\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6bcf\u500b\u54e1\u5de5\u7684\u552f\u4e00\u6027\u3002\u6b64\u5916\uff0c\u6211\u5011\u9084\u5728 LastName \u5217\u4e0a\u5275\u5efa\u4e86\u4e00\u500b\u7d22\u5f15\uff0c\u9019\u6a23\u5728\u6839\u64da\u59d3\u6c0f\u9032\u884c\u6392\u5e8f\u6642\uff0c\u67e5\u8a62\u6027\u80fd\u6703\u66f4\u597d\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e6%99%82%e7%9a%84%e6%8e%92%e5%ba%8f-emNFVZDVTD\">\u67e5\u8a62\u6642\u7684\u6392\u5e8f<\/h2>\n<p>\u5728\u6578\u64da\u8868\u5275\u5efa\u5b8c\u6210\u5f8c\uff0c\u7576\u6211\u5011\u9700\u8981\u67e5\u8a62\u6578\u64da\u4e26\u9032\u884c\u6392\u5e8f\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 SQL \u7684 ORDER BY \u5b50\u53e5\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM Employees\nORDER BY LastName ASC, HireDate DESC;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u9996\u5148\u6839\u64da LastName \u9032\u884c\u5347\u5e8f\u6392\u5e8f\uff0c\u7136\u5f8c\u6839\u64da HireDate \u9032\u884c\u964d\u5e8f\u6392\u5e8f\u3002\u9019\u6a23\u7684\u67e5\u8a62\u80fd\u5920\u6709\u6548\u5730\u7d44\u7e54\u548c\u986f\u793a\u6578\u64da\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-emNFVZDVTD\">\u7d50\u8ad6<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u5efa\u8868\u6642\uff0c\u96d6\u7136\u7121\u6cd5\u76f4\u63a5\u6307\u5b9a\u6578\u64da\u7684\u6392\u5e8f\u65b9\u5f0f\uff0c\u4f46\u901a\u904e\u9078\u64c7\u5408\u9069\u7684\u4e3b\u9375\u3001\u4f7f\u7528\u7d22\u5f15\u548c\u8003\u616e\u6578\u64da\u985e\u578b\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u70ba\u672a\u4f86\u7684\u6392\u5e8f\u64cd\u4f5c\u6253\u4e0b\u826f\u597d\u7684\u57fa\u790e\u3002\u9019\u4e9b\u8003\u91cf\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u9084\u80fd\u6539\u5584\u6574\u9ad4\u7684\u6578\u64da\u7ba1\u7406\u9ad4\u9a57\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u554f\u984c\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\u3002\u6211\u5011\u63d0\u4f9b\u5404\u7a2e <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u60a8\u7684\u6578\u64da\u548c\u61c9\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728\u6578\u64da\u5eab\u5efa\u8868\u6642\u9032\u884c\u6392\u5e8f\uff0c\u638c\u63e1\u6392\u5e8f\u8a9e\u53e5\u7684\u4f7f\u7528\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\u8207\u67e5\u8a62\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-179800","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179800","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=179800"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179800\/revisions"}],"predecessor-version":[{"id":179801,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179800\/revisions\/179801"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179800"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179800"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}