{"id":168387,"date":"2024-11-06T11:57:24","date_gmt":"2024-11-06T03:57:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168387\/"},"modified":"2024-11-06T11:57:24","modified_gmt":"2024-11-06T03:57:24","slug":"sql-%e6%95%b8%e6%93%9a%e5%93%a1%e5%b7%a5%e5%ba%ab%e9%a1%8c%e8%a7%a3%e6%9e%90-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%93%a1%e5%b7%a5%e5%ba%ab%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168387\/","title":{"rendered":"SQL \u6578\u64da\u54e1\u5de5\u5eab\u984c\u89e3\u6790 (sql \u6578\u64da\u5eab\u54e1\u5de5\u5eab\u984c)"},"content":{"rendered":"

SQL \u6578\u64da\u54e1\u5de5\u5eab\u984c\u89e3\u6790<\/h1>\n

\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u6210\u70ba\u4e86\u6578\u64da\u5eab\u7ba1\u7406\u548c\u64cd\u4f5c\u7684\u6838\u5fc3\u5de5\u5177\u3002\u7121\u8ad6\u662f\u4f01\u696d\u9084\u662f\u500b\u4eba\uff0c\u5c0d\u65bc\u6578\u64da\u7684\u7ba1\u7406\u548c\u5206\u6790\u90fd\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eSQL\u6578\u64da\u5eab\u4e2d\u7684\u54e1\u5de5\u5eab\u984c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u89e3\u6790\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u54e1\u5de5\u5eab\u984c\uff1f<\/h2>\n

\u54e1\u5de5\u5eab\u984c\u901a\u5e38\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\u5b58\u5132\u6709\u95dc\u54e1\u5de5\u7684\u5404\u7a2e\u4fe1\u606f\uff0c\u5305\u62ec\u59d3\u540d\u3001\u5de5\u865f\u3001\u90e8\u9580\u3001\u85aa\u8cc7\u7b49\u3002\u9019\u4e9b\u4fe1\u606f\u53ef\u4ee5\u7528\u4f86\u9032\u884c\u5404\u7a2e\u67e5\u8a62\u548c\u5206\u6790\uff0c\u5e6b\u52a9\u4f01\u696d\u505a\u51fa\u66f4\u597d\u7684\u6c7a\u7b56\u3002<\/p>\n

\u5efa\u7acb\u54e1\u5de5\u6578\u64da\u5eab<\/h2>\n

\u9996\u5148\uff0c\u6211\u5011\u9700\u8981\u5efa\u7acb\u4e00\u500b\u54e1\u5de5\u6578\u64da\u5eab\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u4e00\u500b\u7c21\u55ae\u7684\u54e1\u5de5\u8868\u7684SQL\u8a9e\u53e5\uff1a<\/p>\n

CREATE TABLE Employees (\n    EmployeeID INT PRIMARY KEY,\n    FirstName VARCHAR(50),\n    LastName VARCHAR(50),\n    Department VARCHAR(50),\n    Salary DECIMAL(10, 2)\n);<\/code><\/pre>\n
\u5728\u9019\u500b\u8868\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e94\u500b\u5b57\u6bb5\uff1a\u54e1\u5de5ID\u3001\u540d\u5b57\u3001\u59d3\u6c0f\u3001\u90e8\u9580\u548c\u85aa\u8cc7\u3002\u9019\u4e9b\u5b57\u6bb5\u5c07\u7528\u4f86\u5b58\u5132\u6bcf\u4f4d\u54e1\u5de5\u7684\u57fa\u672c\u4fe1\u606f\u3002<\/p>\n
\u63d2\u5165\u6578\u64da<\/h2>\n
\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u53ef\u4ee5\u5411\u54e1\u5de5\u8868\u4e2d\u63d2\u5165\u4e00\u4e9b\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u63d2\u5165\u6578\u64da\u7684SQL\u8a9e\u53e5\u793a\u4f8b\uff1a<\/p>\n
INSERT INTO Employees (EmployeeID, FirstName, LastName, Department, Salary) VALUES\n(1, 'John', 'Doe', 'IT', 60000.00),\n(2, 'Jane', 'Smith', 'HR', 55000.00),\n(3, 'Mike', 'Johnson', 'Finance', 70000.00);<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u5c07\u4e09\u4f4d\u54e1\u5de5\u7684\u6578\u64da\u63d2\u5165\u5230Employees\u8868\u4e2d\u3002<\/p>\n
\u67e5\u8a62\u6578\u64da<\/h2>\n
\u4e00\u65e6\u6578\u64da\u88ab\u63d2\u5165\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528SQL\u67e5\u8a62\u4f86\u6aa2\u7d22\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u67e5\u8a62\u6240\u6709IT\u90e8\u9580\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n
SELECT * FROM Employees WHERE Department = 'IT';<\/code><\/pre>\n
\u9019\u5c07\u8fd4\u56de\u6240\u6709\u5728IT\u90e8\u9580\u5de5\u4f5c\u7684\u54e1\u5de5\u7684\u8a73\u7d30\u4fe1\u606f\u3002<\/p>\n
\u66f4\u65b0\u6578\u64da<\/h2>\n
\u5982\u679c\u9700\u8981\u66f4\u65b0\u67d0\u4f4d\u54e1\u5de5\u7684\u85aa\u8cc7\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528UPDATE\u8a9e\u53e5\u3002\u4f8b\u5982\uff0c\u5c07John Doe\u7684\u85aa\u8cc7\u63d0\u9ad8\u523065000\uff1a<\/p>\n
UPDATE Employees SET Salary = 65000 WHERE EmployeeID = 1;<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u5c07\u66f4\u65b0\u54e1\u5de5ID\u70ba1\u7684John Doe\u7684\u85aa\u8cc7\u3002<\/p>\n
\u522a\u9664\u6578\u64da<\/h2>\n
\u5982\u679c\u9700\u8981\u522a\u9664\u67d0\u4f4d\u54e1\u5de5\u7684\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528DELETE\u8a9e\u53e5\u3002\u4f8b\u5982\uff0c\u522a\u9664\u54e1\u5de5ID\u70ba2\u7684Jane Smith\uff1a<\/p>\n
DELETE FROM Employees WHERE EmployeeID = 2;<\/code><\/pre>\n
\u9019\u5c07\u5f9eEmployees\u8868\u4e2d\u522a\u9664Jane Smith\u7684\u8a18\u9304\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
SQL\u6578\u64da\u5eab\u7684\u54e1\u5de5\u5eab\u984c\u662f\u4f01\u696d\u6578\u64da\u7ba1\u7406\u7684\u91cd\u8981\u7d44\u6210\u90e8\u5206\u3002\u901a\u904e\u5efa\u7acb\u3001\u63d2\u5165\u3001\u67e5\u8a62\u3001\u66f4\u65b0\u548c\u522a\u9664\u6578\u64da\uff0c\u4f01\u696d\u80fd\u5920\u6709\u6548\u5730\u7ba1\u7406\u5176\u4eba\u529b\u8cc7\u6e90\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u7684SQL\u64cd\u4f5c\u4e0d\u50c5\u80fd\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\uff0c\u9084\u80fd\u5e6b\u52a9\u4f01\u696d\u505a\u51fa\u66f4\u660e\u667a\u7684\u6c7a\u7b56\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u9999\u6e2f\u4f7f\u7528VPS<\/a>\u4f86\u642d\u5efa\u81ea\u5df1\u7684\u6578\u64da\u5eab\u6709\u8208\u8da3\uff0cServer.HK\u63d0\u4f9b\u4e86\u591a\u7a2e\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u904b\u884c\u60a8\u7684\u6578\u64da\u5eab\u3002\u7121\u8ad6\u662f\u9999\u6e2fVPS<\/a>\u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6df1\u5165\u89e3\u6790SQL\u6578\u64da\u5eab\u54e1\u5de5\u5eab\u984c\uff0c\u63d0\u4f9b\u89e3\u984c\u601d\u8def\u8207\u7bc4\u4f8b\uff0c\u5e6b\u52a9\u63d0\u5347\u6578\u64da\u67e5\u8a62\u8207\u7ba1\u7406\u6280\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-168387","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168387","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=168387"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168387\/revisions"}],"predecessor-version":[{"id":168388,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168387\/revisions\/168388"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}