{"id":193997,"date":"2024-11-13T02:54:20","date_gmt":"2024-11-12T18:54:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/193997\/"},"modified":"2024-11-13T02:54:21","modified_gmt":"2024-11-12T18:54:21","slug":"%e4%b8%80%e5%80%8bsql%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e9%9d%a2%e8%a9%a6%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/193997\/","title":{"rendered":"\u4e00\u500bSQL\u5b58\u5132\u904e\u7a0b\u9762\u8a66\u984c"},"content":{"rendered":"<h1 id=\"%e4%b8%80%e5%80%8bsql%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e9%9d%a2%e8%a9%a6%e9%a1%8c-aWCEakQlEB\">\u4e00\u500bSQL\u5b58\u5132\u904e\u7a0b\u9762\u8a66\u984c<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u6578\u64da\u5eab\u7ba1\u7406\u548c\u64cd\u4f5c\u7684\u6838\u5fc3\u5de5\u5177\u3002\u5c0d\u65bc\u5e0c\u671b\u5728\u6578\u64da\u5eab\u7ba1\u7406\u9818\u57df\u767c\u5c55\u7684\u5c08\u696d\u4eba\u58eb\u4f86\u8aaa\uff0c\u638c\u63e1SQL\u5b58\u5132\u904e\u7a0b\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u5b58\u5132\u904e\u7a0b\u662f\u4e00\u7d44\u9810\u5148\u7de8\u5beb\u7684SQL\u8a9e\u53e5\uff0c\u9019\u4e9b\u8a9e\u53e5\u53ef\u4ee5\u88ab\u591a\u6b21\u8abf\u7528\uff0c\u5f9e\u800c\u63d0\u9ad8\u4e86\u4ee3\u78bc\u7684\u91cd\u7528\u6027\u548c\u57f7\u884c\u6548\u7387\u3002\u5728\u9762\u8a66\u4e2d\uff0c\u8003\u5b98\u7d93\u5e38\u6703\u63d0\u51fa\u8207\u5b58\u5132\u904e\u7a0b\u76f8\u95dc\u7684\u554f\u984c\uff0c\u4ee5\u8a55\u4f30\u5019\u9078\u4eba\u7684\u6280\u8853\u80fd\u529b\u548c\u554f\u984c\u89e3\u6c7a\u80fd\u529b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afsql%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%ef%bc%9f-aWCEakQlEB\">\u4ec0\u9ebc\u662fSQL\u5b58\u5132\u904e\u7a0b\uff1f<\/h2>\n<p>SQL\u5b58\u5132\u904e\u7a0b\u662f\u4e00\u7a2e\u5728\u6578\u64da\u5eab\u4e2d\u5b58\u5132\u7684\u7a0b\u5e8f\uff0c\u5b83\u53ef\u4ee5\u5305\u542b\u591a\u500bSQL\u8a9e\u53e5\uff0c\u4e26\u4e14\u53ef\u4ee5\u63a5\u53d7\u53c3\u6578\u3002\u5b58\u5132\u904e\u7a0b\u7684\u4e3b\u8981\u512a\u52e2\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u63d0\u9ad8\u6027\u80fd\uff1a\u5b58\u5132\u904e\u7a0b\u5728\u6578\u64da\u5eab\u4e2d\u7de8\u8b6f\u4e26\u5b58\u5132\uff0c\u57f7\u884c\u6642\u4e0d\u9700\u8981\u91cd\u65b0\u7de8\u8b6f\u3002<\/li>\n<li>\u589e\u5f37\u5b89\u5168\u6027\uff1a\u901a\u904e\u5b58\u5132\u904e\u7a0b\uff0c\u53ef\u4ee5\u9650\u5236\u7528\u6236\u5c0d\u6578\u64da\u5eab\u7684\u76f4\u63a5\u8a2a\u554f\u3002<\/li>\n<li>\u4ee3\u78bc\u91cd\u7528\uff1a\u5b58\u5132\u904e\u7a0b\u53ef\u4ee5\u88ab\u591a\u500b\u61c9\u7528\u7a0b\u5e8f\u6216\u7528\u6236\u8abf\u7528\uff0c\u6e1b\u5c11\u4e86\u4ee3\u78bc\u7684\u91cd\u8907\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%9d%a2%e8%a9%a6%e9%a1%8c%e7%a4%ba%e4%be%8b-aWCEakQlEB\">\u9762\u8a66\u984c\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u5e38\u898b\u7684SQL\u5b58\u5132\u904e\u7a0b\u9762\u8a66\u984c\uff1a<\/p>\n<h3 id=\"%e9%a1%8c%e7%9b%ae%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%ef%bc%8c%e8%a8%88%e7%ae%97%e6%9f%90%e5%80%8b%e9%83%a8%e9%96%80%e7%9a%84%e5%93%a1%e5%b7%a5%e5%b9%b3-aWCEakQlEB\">\u984c\u76ee\uff1a\u5275\u5efa\u4e00\u500b\u5b58\u5132\u904e\u7a0b\uff0c\u8a08\u7b97\u67d0\u500b\u90e8\u9580\u7684\u54e1\u5de5\u5e73\u5747\u5de5\u8cc7\u3002<\/h3>\n<p>\u5047\u8a2d\u6709\u4e00\u500b\u540d\u70ba <code>Employees<\/code> \u7684\u8868\uff0c\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre>\nCREATE TABLE Employees (\n    EmployeeID INT PRIMARY KEY,\n    Name VARCHAR(100),\n    DepartmentID INT,\n    Salary DECIMAL(10, 2)\n);\n<\/pre>\n<p>\u8981\u6c42\u5275\u5efa\u4e00\u500b\u540d\u70ba <code>GetAverageSalaryByDepartment<\/code> \u7684\u5b58\u5132\u904e\u7a0b\uff0c\u63a5\u53d7\u4e00\u500b\u90e8\u9580ID\u4f5c\u70ba\u53c3\u6578\uff0c\u4e26\u8fd4\u56de\u8a72\u90e8\u9580\u7684\u5e73\u5747\u5de5\u8cc7\u3002<\/p>\n<h4 id=\"%e8%a7%a3%e7%ad%94%e7%a4%ba%e4%be%8b%ef%bc%9a-aWCEakQlEB\">\u89e3\u7b54\u793a\u4f8b\uff1a<\/h4>\n<pre>\nDELIMITER \/\/\nCREATE PROCEDURE GetAverageSalaryByDepartment(IN deptID INT, OUT avgSalary DECIMAL(10, 2))\nBEGIN\n    SELECT AVG(Salary) INTO avgSalary\n    FROM Employees\n    WHERE DepartmentID = deptID;\nEND \/\/\nDELIMITER ;\n<\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86 <code>AVG()<\/code> \u51fd\u6578\u4f86\u8a08\u7b97\u5e73\u5747\u5de5\u8cc7\uff0c\u4e26\u4f7f\u7528 <code>IN<\/code> \u548c <code>OUT<\/code> \u53c3\u6578\u4f86\u50b3\u905e\u90e8\u9580ID\u548c\u8fd4\u56de\u7684\u5e73\u5747\u5de5\u8cc7\u3002<\/p>\n<h2 id=\"%e6%b8%ac%e8%a9%a6%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b-aWCEakQlEB\">\u6e2c\u8a66\u5b58\u5132\u904e\u7a0b<\/h2>\n<p>\u5275\u5efa\u5b58\u5132\u904e\u7a0b\u5f8c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u6e2c\u8a66\u5b83\uff1a<\/p>\n<pre>\nCALL GetAverageSalaryByDepartment(1, @avgSalary);\nSELECT @avgSalary;\n<\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u8abf\u7528\u5b58\u5132\u904e\u7a0b\u4e26\u67e5\u770b\u8fd4\u56de\u7684\u5e73\u5747\u5de5\u8cc7\u3002<\/p>\n<h2 id=\"%e9%9d%a2%e8%a9%a6%e4%b8%ad%e7%9a%84%e5%85%b6%e4%bb%96%e8%80%83%e6%85%ae%e5%9b%a0%e7%b4%a0-aWCEakQlEB\">\u9762\u8a66\u4e2d\u7684\u5176\u4ed6\u8003\u616e\u56e0\u7d20<\/h2>\n<p>\u5728\u9762\u8a66\u4e2d\uff0c\u9664\u4e86\u7de8\u5beb\u5b58\u5132\u904e\u7a0b\u7684\u80fd\u529b\u5916\uff0c\u8003\u5b98\u9084\u53ef\u80fd\u6703\u95dc\u6ce8\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u932f\u8aa4\u8655\u7406\uff1a\u5982\u4f55\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\u8655\u7406\u6f5b\u5728\u7684\u932f\u8aa4\uff1f<\/li>\n<li>\u6027\u80fd\u512a\u5316\uff1a\u5982\u4f55\u512a\u5316\u5b58\u5132\u904e\u7a0b\u4ee5\u63d0\u9ad8\u57f7\u884c\u6548\u7387\uff1f<\/li>\n<li>\u5b89\u5168\u6027\uff1a\u5982\u4f55\u78ba\u4fdd\u5b58\u5132\u904e\u7a0b\u7684\u5b89\u5168\u6027\uff0c\u9632\u6b62SQL\u6ce8\u5165\u653b\u64ca\uff1f<\/li>\n<\/ul>\n<p>\u9019\u4e9b\u554f\u984c\u4e0d\u50c5\u8003\u9a57\u5019\u9078\u4eba\u7684\u6280\u8853\u80fd\u529b\uff0c\u9084\u8003\u9a57\u5176\u5c0d\u6578\u64da\u5eab\u5b89\u5168\u548c\u6027\u80fd\u7684\u7406\u89e3\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-aWCEakQlEB\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1SQL\u5b58\u5132\u904e\u7a0b\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u5c08\u696d\u4eba\u58eb\u81f3\u95dc\u91cd\u8981\u3002\u5728\u9762\u8a66\u4e2d\uff0c\u80fd\u5920\u6e05\u6670\u5730\u89e3\u91cb\u548c\u7de8\u5beb\u5b58\u5132\u904e\u7a0b\u5c07\u6709\u52a9\u65bc\u5c55\u793a\u60a8\u7684\u6280\u8853\u80fd\u529b\u3002\u7121\u8ad6\u662f\u5275\u5efa\u5b58\u5132\u904e\u7a0b\u3001\u6e2c\u8a66\u5176\u529f\u80fd\uff0c\u9084\u662f\u8003\u616e\u6027\u80fd\u548c\u5b89\u5168\u6027\uff0c\u9019\u4e9b\u90fd\u662f\u9762\u8a66\u4e2d\u53ef\u80fd\u6703\u88ab\u554f\u5230\u7684\u95dc\u9375\u9ede\u3002\u5982\u679c\u60a8\u5c0d\u65bc\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u4e00\u500bSQL\u5b58\u5132\u904e\u7a0b\u9762\u8a66\u984c\uff0c\u4e86\u89e3\u5982\u4f55\u8a2d\u8a08\u3001\u512a\u5316\u548c\u8abf\u8a66\u5b58\u5132\u904e\u7a0b\u4ee5\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u548c\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-193997","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193997","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=193997"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193997\/revisions"}],"predecessor-version":[{"id":193998,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193997\/revisions\/193998"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=193997"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=193997"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=193997"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}