{"id":164597,"date":"2024-11-05T09:14:27","date_gmt":"2024-11-05T01:14:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/164597\/"},"modified":"2024-11-05T09:14:28","modified_gmt":"2024-11-05T01:14:28","slug":"%e5%b0%b1%e6%95%b8%e6%93%9a%e5%ba%ab%e8%80%8c%e8%a8%80%ef%bc%9amssql%e4%b8%ad3%e5%80%8b%e8%a1%a8%e5%a6%82%e4%bd%95%e9%80%a3%e6%8e%a5%ef%bc%9f%ef%bc%88mssql3%e8%a1%a8%e6%80%8e%e9%ba%bc%e9%80%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/164597\/","title":{"rendered":"\u5c31\u6578\u64da\u5eab\u800c\u8a00\uff1amssql\u4e2d3\u500b\u8868\u5982\u4f55\u9023\u63a5\uff1f\uff08mssql3\u8868\u600e\u9ebc\u9023\u63a5\uff09"},"content":{"rendered":"<h1 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id=\"mssql%e4%b8%ad%e7%9a%84%e9%80%a3%e6%8e%a5%e9%a1%9e%e5%9e%8b-FcUzOQmQme\">MSSQL\u4e2d\u7684\u9023\u63a5\u985e\u578b<\/h2>\n<p>MSSQL\u652f\u6301\u591a\u7a2e\u9023\u63a5\u985e\u578b\uff0c\u6700\u5e38\u898b\u7684\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u5167\u90e8\u9023\u63a5\uff08INNER JOIN\uff09<\/strong>\uff1a\u53ea\u8fd4\u56de\u5728\u5169\u500b\u8868\u4e2d\u90fd\u6709\u7684\u8a18\u9304\u3002<\/li>\n<li><strong>\u5916\u90e8\u9023\u63a5\uff08OUTER JOIN\uff09<\/strong>\uff1a\u8fd4\u56de\u5728\u4e00\u500b\u8868\u4e2d\u5b58\u5728\u7684\u6240\u6709\u8a18\u9304\uff0c\u5373\u4f7f\u5728\u53e6\u4e00\u500b\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u8a18\u9304\u3002<\/li>\n<li><strong>\u4ea4\u53c9\u9023\u63a5\uff08CROSS JOIN\uff09<\/strong>\uff1a\u8fd4\u56de\u5169\u500b\u8868\u7684\u7b1b\u5361\u723e\u7a4d\uff0c\u5373\u6bcf\u4e00\u884c\u90fd\u8207\u53e6\u4e00\u500b\u8868\u7684\u6bcf\u4e00\u884c\u76f8\u9023\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%80%a3%e6%8e%a5%e4%b8%89%e5%80%8b%e8%a1%a8%e7%9a%84%e7%a4%ba%e4%be%8b-FcUzOQmQme\">\u9023\u63a5\u4e09\u500b\u8868\u7684\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e09\u500b\u8868\uff1a<code>Customers<\/code>\uff08\u5ba2\u6236\uff09\u3001<code>Orders<\/code>\uff08\u8a02\u55ae\uff09\u548c<code>Products<\/code>\uff08\u7522\u54c1\uff09\u3002\u9019\u4e09\u500b\u8868\u7684\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre>\nCustomers\n---------\nCustomerID | CustomerName\n1           | Alice\n2           | Bob\n\nOrders\n------\nOrderID | CustomerID | ProductID\n1       | 1          | 1\n2       | 1          | 2\n3       | 2          | 1\n\nProducts\n--------\nProductID | ProductName\n1         | Laptop\n2         | Phone\n<\/pre>\n<p>\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u6bcf\u4f4d\u5ba2\u6236\u7684\u8a02\u55ae\u53ca\u5176\u6240\u8a02\u8cfc\u7684\u7522\u54c1\u540d\u7a31\u3002\u53ef\u4ee5\u4f7f\u7528\u5167\u90e8\u9023\u63a5\u4f86\u5be6\u73fe\u9019\u4e00\u9ede\uff1a<\/p>\n<pre>\nSELECT \n    c.CustomerName, \n    o.OrderID, \n    p.ProductName\nFROM \n    Customers c\nINNER JOIN \n    Orders o ON c.CustomerID = o.CustomerID\nINNER JOIN \n    Products p ON o.ProductID = p.ProductID;\n<\/pre>\n<p>\u9019\u6bb5\u67e5\u8a62\u5c07\u8fd4\u56de\u4ee5\u4e0b\u7d50\u679c\uff1a<\/p>\n<pre>\nCustomerName | OrderID | ProductName\nAlice        | 1       | Laptop\nAlice        | 2       | Phone\nBob          | 3       | Laptop\n<\/pre>\n<h2 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