{"id":187186,"date":"2024-11-11T12:10:19","date_gmt":"2024-11-11T04:10:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187186\/"},"modified":"2024-11-11T12:10:20","modified_gmt":"2024-11-11T04:10:20","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e5%af%a6%e9%a9%97%e5%85%ad%ef%bc%9a%e5%ad%b8%e7%bf%92%e6%95%b8%e6%93%9a%e8%a1%a8%e8%a8%ad%e8%a8%88%e8%88%87%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96-%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187186\/","title":{"rendered":"\u6578\u64da\u5eab\u5be6\u9a57\u516d\uff1a\u5b78\u7fd2\u6578\u64da\u8868\u8a2d\u8a08\u8207\u67e5\u8a62\u512a\u5316 (\u6578\u64da\u5eab\u5be6\u9a57\u516d_\u5f35\u6771\u7ad9)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e5%af%a6%e9%a9%97%e5%85%ad%ef%bc%9a%e5%ad%b8%e7%bf%92%e6%95%b8%e6%93%9a%e8%a1%a8%e8%a8%ad%e8%a8%88%e8%88%87%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96-%e6%95%b8%e6%93%9a%e5%ba%ab-GIUCQaTgTn\">\u6578\u64da\u5eab\u5be6\u9a57\u516d\uff1a\u5b78\u7fd2\u6578\u64da\u8868\u8a2d\u8a08\u8207\u67e5\u8a62\u512a\u5316 (\u6578\u64da\u5eab\u5be6\u9a57\u516d_\u5f35\u6771\u7ad9)<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u8a2d\u8a08\u8207\u67e5\u8a62\u512a\u5316\u662f\u6bcf\u4f4d\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u548c\u958b\u767c\u8005\u5fc5\u9808\u638c\u63e1\u7684\u6838\u5fc3\u6280\u80fd\u3002\u6578\u64da\u5eab\u5be6\u9a57\u516d\u5c08\u6ce8\u65bc\u6578\u64da\u8868\u7684\u8a2d\u8a08\u8207\u67e5\u8a62\u7684\u512a\u5316\uff0c\u9019\u5c0d\u65bc\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e8%a1%a8%e8%a8%ad%e8%a8%88%e7%9a%84%e9%87%8d%e8%a6%81%e6%80%a7-GIUCQaTgTn\">\u6578\u64da\u8868\u8a2d\u8a08\u7684\u91cd\u8981\u6027<\/h2>\n<p>\u6578\u64da\u8868\u8a2d\u8a08\u662f\u6578\u64da\u5eab\u8a2d\u8a08\u7684\u57fa\u790e\uff0c\u826f\u597d\u7684\u6578\u64da\u8868\u8a2d\u8a08\u80fd\u5920\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u3001\u4e00\u81f4\u6027\u548c\u53ef\u64f4\u5c55\u6027\u3002\u8a2d\u8a08\u6578\u64da\u8868\u6642\uff0c\u61c9\u8003\u616e\u4ee5\u4e0b\u5e7e\u500b\u8981\u7d20\uff1a<\/p>\n<ul>\n<li><strong>\u6b63\u898f\u5316\uff1a<\/strong>\u6b63\u898f\u5316\u662f\u5c07\u6578\u64da\u5206\u89e3\u70ba\u591a\u500b\u8868\uff0c\u4ee5\u6d88\u9664\u5197\u9918\u548c\u4f9d\u8cf4\u6027\u3002\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002\u4f8b\u5982\uff0c\u5c07\u5ba2\u6236\u4fe1\u606f\u548c\u8a02\u55ae\u4fe1\u606f\u5206\u958b\u5b58\u5132\uff0c\u53ef\u4ee5\u907f\u514d\u91cd\u8907\u6578\u64da\u3002<\/li>\n<li><strong>\u4e3b\u9375\u8207\u5916\u9375\uff1a<\/strong>\u4e3b\u9375\u662f\u552f\u4e00\u6a19\u8b58\u8868\u4e2d\u6bcf\u4e00\u884c\u7684\u5b57\u6bb5\uff0c\u800c\u5916\u9375\u5247\u7528\u65bc\u5efa\u7acb\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002\u6b63\u78ba\u4f7f\u7528\u4e3b\u9375\u548c\u5916\u9375\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\u3002<\/li>\n<li><strong>\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\uff1a<\/strong>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u53ef\u4ee5\u7bc0\u7701\u5b58\u5132\u7a7a\u9593\u4e26\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u5e74\u9f61\u9019\u4e00\u5b57\u6bb5\uff0c\u4f7f\u7528\u6574\u6578\u985e\u578b\u800c\u975e\u5b57\u7b26\u4e32\u985e\u578b\u6703\u66f4\u6709\u6548\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%e7%9a%84%e7%ad%96%e7%95%a5-GIUCQaTgTn\">\u67e5\u8a62\u512a\u5316\u7684\u7b56\u7565<\/h2>\n<p>\u67e5\u8a62\u512a\u5316\u662f\u63d0\u9ad8\u6578\u64da\u5eab\u6027\u80fd\u7684\u95dc\u9375\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u67e5\u8a62\u512a\u5316\u7b56\u7565\uff1a<\/p>\n<ul>\n<li><strong>\u7d22\u5f15\u7684\u4f7f\u7528\uff1a<\/strong>\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u3002\u5c0d\u65bc\u7d93\u5e38\u7528\u65bc\u67e5\u8a62\u7684\u5b57\u6bb5\uff0c\u61c9\u8003\u616e\u5efa\u7acb\u7d22\u5f15\u3002\u7136\u800c\uff0c\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u5beb\u5165\u6027\u80fd\uff0c\u56e0\u6b64\u9700\u8981\u5e73\u8861\u3002<\/li>\n<li><strong>\u907f\u514d\u4f7f\u7528SELECT *\uff1a<\/strong>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528SELECT *\u6703\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\uff0c\u61c9\u660e\u78ba\u6307\u5b9a\u9700\u8981\u7684\u5b57\u6bb5\u3002<\/li>\n<li><strong>\u4f7f\u7528JOIN\u800c\u975e\u5b50\u67e5\u8a62\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528JOIN\u53ef\u4ee5\u6bd4\u5b50\u67e5\u8a62\u66f4\u9ad8\u6548\uff0c\u56e0\u70baJOIN\u53ef\u4ee5\u5728\u55ae\u4e00\u67e5\u8a62\u4e2d\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%af%a6%e9%a9%97%e6%a1%88%e4%be%8b%e5%88%86%e6%9e%90-GIUCQaTgTn\">\u5be6\u9a57\u6848\u4f8b\u5206\u6790<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u5be6\u9a57\u516d\u4e2d\uff0c\u6211\u5011\u5c07\u901a\u904e\u4e00\u500b\u5be6\u969b\u6848\u4f8b\u4f86\u6f14\u793a\u6578\u64da\u8868\u8a2d\u8a08\u8207\u67e5\u8a62\u512a\u5316\u7684\u904e\u7a0b\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\uff0c\u6d89\u53ca\u5230\u5ba2\u6236\u3001\u7522\u54c1\u548c\u8a02\u55ae\u4e09\u500b\u4e3b\u8981\u5be6\u9ad4\u3002<\/p>\n<h3 id=\"%e6%95%b8%e6%93%9a%e8%a1%a8%e8%a8%ad%e8%a8%88-GIUCQaTgTn\">\u6578\u64da\u8868\u8a2d\u8a08<\/h3>\n<pre><code>\nCREATE TABLE Customers (\n    CustomerID INT PRIMARY KEY,\n    Name VARCHAR(100),\n    Email VARCHAR(100) UNIQUE,\n    CreatedAt DATETIME DEFAULT CURRENT_TIMESTAMP\n);\n\nCREATE TABLE Products (\n    ProductID INT PRIMARY KEY,\n    ProductName VARCHAR(100),\n    Price DECIMAL(10, 2)\n);\n\nCREATE TABLE Orders (\n    OrderID INT PRIMARY KEY,\n    CustomerID INT,\n    ProductID INT,\n    OrderDate DATETIME DEFAULT CURRENT_TIMESTAMP,\n    FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID),\n    FOREIGN KEY (ProductID) REFERENCES Products(ProductID)\n);\n<\/code><\/pre>\n<h3 id=\"%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%e7%a4%ba%e4%be%8b-GIUCQaTgTn\">\u67e5\u8a62\u512a\u5316\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u9700\u8981\u67e5\u8a62\u6240\u6709\u8a02\u55ae\u53ca\u5176\u5c0d\u61c9\u7684\u5ba2\u6236\u548c\u7522\u54c1\u4fe1\u606f\uff0c\u4ee5\u4e0b\u662f\u512a\u5316\u524d\u7684\u67e5\u8a62\uff1a<\/p>\n<pre><code>\nSELECT * FROM Orders\nJOIN Customers ON Orders.CustomerID = Customers.CustomerID\nJOIN Products ON Orders.ProductID = Products.ProductID;\n<\/code><\/pre>\n<p>\u512a\u5316\u5f8c\u7684\u67e5\u8a62\uff0c\u50c5\u9078\u64c7\u5fc5\u8981\u7684\u5b57\u6bb5\uff1a<\/p>\n<pre><code>\nSELECT Orders.OrderID, Customers.Name, Products.ProductName\nFROM Orders\nJOIN Customers ON Orders.CustomerID = Customers.CustomerID\nJOIN Products ON Orders.ProductID = Products.ProductID;\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-GIUCQaTgTn\">\u7d50\u8ad6<\/h2>\n<p>\u6578\u64da\u8868\u8a2d\u8a08\u8207\u67e5\u8a62\u512a\u5316\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u90e8\u5206\u3002\u901a\u904e\u5408\u7406\u7684\u6578\u64da\u8868\u8a2d\u8a08\u548c\u6709\u6548\u7684\u67e5\u8a62\u512a\u5316\u7b56\u7565\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6548\u7387\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u9019\u4e9b\u6280\u80fd\u5c07\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u512a\u5316\u7684\u8cc7\u8a0a\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\uff0c\u7372\u53d6\u66f4\u591a\u8cc7\u6e90\u548c\u652f\u6301\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u63d0\u4f9b\u5c08\u696d\u7684\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u6578\u64da\u5eab\u5be6\u9a57\u516d\uff0c\u5b78\u7fd2\u6578\u64da\u8868\u8a2d\u8a08\u8207\u67e5\u8a62\u512a\u5316\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u589e\u5f37\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-187186","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187186","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=187186"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187186\/revisions"}],"predecessor-version":[{"id":187187,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187186\/revisions\/187187"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=187186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=187186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=187186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}