{"id":143811,"date":"2024-11-01T01:27:21","date_gmt":"2024-10-31T17:27:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143811\/"},"modified":"2024-11-01T01:27:22","modified_gmt":"2024-10-31T17:27:22","slug":"sql-%e5%87%bd%e6%95%b8%e8%bf%94%e5%9b%9e%e8%a1%a8%e7%9a%84%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143811\/","title":{"rendered":"SQL \u51fd\u6578\u8fd4\u56de\u8868\u7684\u793a\u4f8b"},"content":{"rendered":"

SQL \u51fd\u6578\u8fd4\u56de\u8868\u7684\u793a\u4f8b<\/h1>\n

\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u67e5\u8a62\u548c\u64cd\u4f5c\u8cc7\u6599\u7684\u6a19\u6e96\u8a9e\u8a00\u3002SQL \u51fd\u6578\u662f\u7528\u4f86\u57f7\u884c\u7279\u5b9a\u64cd\u4f5c\u7684\u7a0b\u5f0f\u78bc\u7247\u6bb5\uff0c\u5176\u4e2d\u4e00\u4e9b\u51fd\u6578\u53ef\u4ee5\u8fd4\u56de\u6574\u500b\u8868\u683c\u3002\u9019\u4e9b\u51fd\u6578\u5728\u8cc7\u6599\u5eab\u7684\u64cd\u4f5c\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u52d5\u614b\u751f\u6210\u8cc7\u6599\u96c6\u7684\u60c5\u6cc1\u4e0b\u3002\u672c\u6587\u5c07\u63a2\u8a0e SQL \u51fd\u6578\u8fd4\u56de\u8868\u7684\u6982\u5ff5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u969b\u7684\u793a\u4f8b\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u8fd4\u56de\u8868\u7684 SQL \u51fd\u6578\uff1f<\/h2>\n

\u8fd4\u56de\u8868\u7684 SQL \u51fd\u6578\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u51fd\u6578\uff0c\u5b83\u53ef\u4ee5\u8fd4\u56de\u4e00\u500b\u8cc7\u6599\u8868\u4f5c\u70ba\u7d50\u679c\u3002\u9019\u4e9b\u51fd\u6578\u901a\u5e38\u7528\u65bc\u8907\u96dc\u7684\u67e5\u8a62\u4e2d\uff0c\u80fd\u5920\u6839\u64da\u8f38\u5165\u53c3\u6578\u751f\u6210\u52d5\u614b\u7684\u8cc7\u6599\u96c6\u3002\u9019\u985e\u51fd\u6578\u5728 SQL Server\u3001PostgreSQL \u548c Oracle \u7b49\u8cc7\u6599\u5eab\u7cfb\u7d71\u4e2d\u90fd\u6709\u5be6\u73fe\u3002<\/p>\n

SQL Server \u4e2d\u7684\u8fd4\u56de\u8868\u51fd\u6578<\/h2>\n

\u5728 SQL Server \u4e2d\uff0c\u8fd4\u56de\u8868\u7684\u51fd\u6578\u88ab\u7a31\u70ba\u300c\u8868\u503c\u51fd\u6578\u300d\uff08Table-Valued Functions, TVF\uff09\u3002\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u5206\u70ba\u5169\u7a2e\u985e\u578b\uff1a\u5167\u806f\u8868\u503c\u51fd\u6578\u548c\u591a\u8a9e\u53e5\u8868\u503c\u51fd\u6578\u3002<\/p>\n

\u5167\u806f\u8868\u503c\u51fd\u6578<\/h3>\n

\u5167\u806f\u8868\u503c\u51fd\u6578\u7684\u8a9e\u6cd5\u985e\u4f3c\u65bc\u8996\u5716\uff0c\u4e26\u4e14\u53ea\u80fd\u6709\u4e00\u500b SELECT \u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n

CREATE FUNCTION dbo.GetEmployeesByDepartment\n(\n    @DepartmentID INT\n)\nRETURNS TABLE\nAS\nRETURN\n(\n    SELECT EmployeeID, EmployeeName\n    FROM Employees\n    WHERE DepartmentID = @DepartmentID\n);\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u51fd\u6578 GetEmployeesByDepartment<\/code> \u63a5\u53d7\u4e00\u500b\u90e8\u9580 ID \u4f5c\u70ba\u53c3\u6578\uff0c\u4e26\u8fd4\u56de\u8a72\u90e8\u9580\u7684\u6240\u6709\u54e1\u5de5\u8cc7\u6599\u3002\u4f7f\u7528\u9019\u500b\u51fd\u6578\u7684\u67e5\u8a62\u5982\u4e0b\uff1a<\/p>\n
SELECT * FROM dbo.GetEmployeesByDepartment(1);\n<\/code><\/pre>\n
\u591a\u8a9e\u53e5\u8868\u503c\u51fd\u6578<\/h3>\n
\u591a\u8a9e\u53e5\u8868\u503c\u51fd\u6578\u5141\u8a31\u4f7f\u7528\u591a\u500b SQL \u8a9e\u53e5\u4f86\u69cb\u5efa\u8fd4\u56de\u7684\u8868\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n
CREATE FUNCTION dbo.GetEmployeeDetails\n(\n    @EmployeeID INT\n)\nRETURNS @EmployeeTable TABLE\n(\n    EmployeeName NVARCHAR(100),\n    DepartmentName NVARCHAR(100)\n)\nAS\nBEGIN\n    INSERT INTO @EmployeeTable\n    SELECT e.EmployeeName, d.DepartmentName\n    FROM Employees e\n    JOIN Departments d ON e.DepartmentID = d.DepartmentID\n    WHERE e.EmployeeID = @EmployeeID;\n\n    RETURN;\nEND;\n<\/code><\/pre>\n
\u9019\u500b\u51fd\u6578 GetEmployeeDetails<\/code> \u8fd4\u56de\u6307\u5b9a\u54e1\u5de5\u7684\u59d3\u540d\u548c\u6240\u5c6c\u90e8\u9580\u540d\u7a31\u3002\u4f7f\u7528\u9019\u500b\u51fd\u6578\u7684\u67e5\u8a62\u5982\u4e0b\uff1a<\/p>\n
SELECT * FROM dbo.GetEmployeeDetails(1);\n<\/code><\/pre>\n
PostgreSQL \u4e2d\u7684\u8fd4\u56de\u8868\u51fd\u6578<\/h2>\n
\u5728 PostgreSQL \u4e2d\uff0c\u8fd4\u56de\u8868\u7684\u51fd\u6578\u4f7f\u7528 RETURNS SETOF<\/code> \u4f86\u5b9a\u7fa9\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n
CREATE FUNCTION get_employees_by_department(dept_id INT)\nRETURNS SETOF employees AS $$\nBEGIN\n    RETURN QUERY\n    SELECT * FROM employees WHERE department_id = dept_id;\nEND;\n$$ LANGUAGE plpgsql;\n<\/code><\/pre>\n
\u9019\u500b\u51fd\u6578 get_employees_by_department<\/code> \u8fd4\u56de\u6307\u5b9a\u90e8\u9580\u7684\u6240\u6709\u54e1\u5de5\u3002\u4f7f\u7528\u9019\u500b\u51fd\u6578\u7684\u67e5\u8a62\u5982\u4e0b\uff1a<\/p>\n
SELECT * FROM get_employees_by_department(1);\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
SQL \u51fd\u6578\u8fd4\u56de\u8868\u7684\u529f\u80fd\u5728\u8cc7\u6599\u5eab\u64cd\u4f5c\u4e2d\u975e\u5e38\u91cd\u8981\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u9748\u6d3b\u5730\u8655\u7406\u8cc7\u6599\u3002\u7121\u8ad6\u662f\u5728 SQL Server \u9084\u662f PostgreSQL\uff0c\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u5920\u6839\u64da\u9700\u6c42\u52d5\u614b\u751f\u6210\u8cc7\u6599\u96c6\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\u548c\u53ef\u8b80\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u8cc7\u6599\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u65b9\u6848\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\uff0c\u7279\u5225\u662f\u5728\u9999\u6e2f\u5730\u5340\u7684\u696d\u52d9\u904b\u71df\u4e2d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22 SQL \u51fd\u6578\u5982\u4f55\u8fd4\u56de\u8868\u7684\u793a\u4f8b\uff0c\u4e86\u89e3\u5176\u7528\u6cd5\u548c\u61c9\u7528\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u548c\u7ba1\u7406\u7684\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-143811","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143811","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=143811"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143811\/revisions"}],"predecessor-version":[{"id":143812,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143811\/revisions\/143812"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143811"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143811"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143811"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}