{"id":180114,"date":"2024-11-09T07:31:19","date_gmt":"2024-11-08T23:31:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/180114\/"},"modified":"2024-11-09T07:31:19","modified_gmt":"2024-11-08T23:31:19","slug":"%e4%b8%89%e5%90%88%e4%b8%80%ef%bc%81%e4%b8%80%e6%ac%a1%e6%9f%a5%e8%a9%a2%e5%a4%9a%e5%bc%b5%e6%95%b8%e6%93%9a%e5%ba%ab-3%e5%bc%b5%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%80%e8%b5%b7%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/180114\/","title":{"rendered":"\u4e09\u5408\u4e00\uff01\u4e00\u6b21\u67e5\u8a62\u591a\u5f35\u6578\u64da\u5eab (3\u5f35\u6578\u64da\u5eab\u4e00\u8d77\u67e5\u8a62)"},"content":{"rendered":"<h1 id=\"%e4%b8%89%e5%90%88%e4%b8%80%ef%bc%81%e4%b8%80%e6%ac%a1%e6%9f%a5%e8%a9%a2%e5%a4%9a%e5%bc%b5%e6%95%b8%e6%93%9a%e5%ba%ab-3%e5%bc%b5%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%80%e8%b5%b7%e6%9f%a5%e8%a9%a2-FCGbAyXTyr\">\u4e09\u5408\u4e00\uff01\u4e00\u6b21\u67e5\u8a62\u591a\u5f35\u6578\u64da\u5eab (3\u5f35\u6578\u64da\u5eab\u4e00\u8d77\u67e5\u8a62)<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u4f7f\u7528\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u666e\u904d\u3002\u8a31\u591a\u4f01\u696d\u548c\u958b\u767c\u8005\u9700\u8981\u5f9e\u591a\u500b\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u4fe1\u606f\uff0c\u4ee5\u4fbf\u9032\u884c\u5206\u6790\u548c\u5831\u544a\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u63a2\u8a0e\u5982\u4f55\u4e00\u6b21\u67e5\u8a62\u591a\u5f35\u6578\u64da\u5eab\uff0c\u7279\u5225\u662f\u91dd\u5c0d\u4e09\u5f35\u6578\u64da\u5eab\u7684\u67e5\u8a62\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e5%a4%9a%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%ef%bc%9f-FCGbAyXTyr\">\u70ba\u4ec0\u9ebc\u9700\u8981\u591a\u6578\u64da\u5eab\u67e5\u8a62\uff1f<\/h2>\n<p>\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\uff0c\u6578\u64da\u53ef\u80fd\u5206\u6563\u5728\u4e0d\u540c\u7684\u6578\u64da\u5eab\u4e2d\u3002\u4f8b\u5982\uff0c\u4e00\u500b\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u53ef\u80fd\u6703\u5c07\u7528\u6236\u4fe1\u606f\u3001\u8a02\u55ae\u4fe1\u606f\u548c\u7522\u54c1\u4fe1\u606f\u5b58\u5132\u5728\u4e0d\u540c\u7684\u6578\u64da\u5eab\u4e2d\u3002\u9019\u6a23\u7684\u8a2d\u8a08\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u53ef\u7ba1\u7406\u6027\uff0c\u4f46\u5728\u9700\u8981\u9032\u884c\u7d9c\u5408\u5206\u6790\u6642\uff0c\u5247\u53ef\u80fd\u6703\u9020\u6210\u4e0d\u4fbf\u3002\u56e0\u6b64\uff0c\u80fd\u5920\u4e00\u6b21\u67e5\u8a62\u591a\u5f35\u6578\u64da\u5eab\u7684\u80fd\u529b\u8b8a\u5f97\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e5%a4%9a%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-FCGbAyXTyr\">\u591a\u6578\u64da\u5eab\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5728\u9032\u884c\u591a\u6578\u64da\u5eab\u67e5\u8a62\u6642\uff0c\u901a\u5e38\u6709\u5e7e\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u9078\u64c7\u3002\u6700\u5e38\u898b\u7684\u65b9\u5f0f\u662f\u4f7f\u7528\u806f\u63a5\uff08JOIN\uff09\u64cd\u4f5c\uff0c\u9019\u53ef\u4ee5\u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u7d50\u5408\u4f86\u81ea\u4e0d\u540c\u6578\u64da\u5eab\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u806f\u63a5\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u5167\u806f\u63a5\uff08INNER JOIN\uff09<\/strong>\uff1a\u53ea\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u5916\u806f\u63a5\uff08OUTER JOIN\uff09<\/strong>\uff1a\u8fd4\u56de\u6240\u6709\u884c\uff0c\u5373\u4f7f\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u4ea4\u53c9\u806f\u63a5\uff08CROSS JOIN\uff09<\/strong>\uff1a\u8fd4\u56de\u5169\u500b\u8868\u7684\u7b1b\u5361\u723e\u7a4d\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8-sql-%e9%80%b2%e8%a1%8c%e5%a4%9a%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2-FCGbAyXTyr\">\u4f7f\u7528 SQL \u9032\u884c\u591a\u6578\u64da\u5eab\u67e5\u8a62<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 SQL \u9032\u884c\u4e09\u5f35\u6578\u64da\u5eab\u67e5\u8a62\u7684\u793a\u4f8b\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e09\u500b\u6578\u64da\u5eab\uff1a<code>users_db<\/code>\u3001<code>orders_db<\/code>\u548c<code>products_db<\/code>\uff0c\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u7528\u6236\u7684\u8a02\u55ae\u53ca\u5176\u6240\u8a02\u8cfc\u7684\u7522\u54c1\u4fe1\u606f\u3002<\/p>\n<pre><code>\nSELECT \n    u.username, \n    o.order_id, \n    p.product_name \nFROM \n    users_db.users AS u \nINNER JOIN \n    orders_db.orders AS o ON u.user_id = o.user_id \nINNER JOIN \n    products_db.products AS p ON o.product_id = p.product_id;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86\u5167\u806f\u63a5\u4f86\u7d50\u5408\u4e09\u500b\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u3002\u9996\u5148\uff0c\u6211\u5011\u5f9e\u7528\u6236\u6578\u64da\u5eab\u4e2d\u9078\u64c7\u7528\u6236\u540d\uff0c\u7136\u5f8c\u901a\u904e\u7528\u6236ID\u5c07\u5176\u8207\u8a02\u55ae\u6578\u64da\u5eab\u4e2d\u7684\u8a02\u55ae\u9032\u884c\u806f\u63a5\uff0c\u6700\u5f8c\u518d\u901a\u904e\u7522\u54c1ID\u5c07\u8a02\u55ae\u8207\u7522\u54c1\u6578\u64da\u5eab\u4e2d\u7684\u7522\u54c1\u9032\u884c\u806f\u63a5\u3002<\/p>\n<h2 id=\"%e8%80%83%e6%85%ae%e6%80%a7%e8%83%bd%e5%95%8f%e9%a1%8c-FCGbAyXTyr\">\u8003\u616e\u6027\u80fd\u554f\u984c<\/h2>\n<p>\u5728\u9032\u884c\u591a\u6578\u64da\u5eab\u67e5\u8a62\u6642\uff0c\u6027\u80fd\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u616e\u56e0\u7d20\u3002\u67e5\u8a62\u7684\u8907\u96dc\u6027\u548c\u6578\u64da\u91cf\u90fd\u6703\u5f71\u97ff\u67e5\u8a62\u7684\u901f\u5ea6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u512a\u5316\u67e5\u8a62\u6027\u80fd\u7684\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u5728\u806f\u63a5\u7684\u5b57\u6bb5\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/li>\n<li>\u907f\u514d\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u904e\u591a\u7684\u806f\u63a5\uff0c\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li>\u8003\u616e\u4f7f\u7528\u8996\u5716\uff08VIEW\uff09\u4f86\u7c21\u5316\u8907\u96dc\u67e5\u8a62\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-FCGbAyXTyr\">\u7d50\u8ad6<\/h2>\n<p>\u4e00\u6b21\u67e5\u8a62\u591a\u5f35\u6578\u64da\u5eab\u7684\u80fd\u529b\u5c0d\u65bc\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u4f7f\u7528 SQL \u7684\u806f\u63a5\u64cd\u4f5c\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u5730\u5f9e\u4e0d\u540c\u7684\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u96d6\u7136\u9019\u6a23\u7684\u67e5\u8a62\u53ef\u80fd\u6703\u9762\u81e8\u6027\u80fd\u6311\u6230\uff0c\u4f46\u901a\u904e\u9069\u7576\u7684\u512a\u5316\u63aa\u65bd\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u9019\u4e9b\u6311\u6230\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u4f01\u696d\u9084\u662f\u5927\u578b\u4f01\u696d\uff0c\u5408\u9069\u7684<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\u90fd\u80fd\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u548c\u67e5\u8a62\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u6b21\u67e5\u8a62\u4e09\u5f35\u6578\u64da\u5eab\uff0c\u5feb\u901f\u7372\u53d6\u591a\u5143\u6578\u64da\uff0c\u63d0\u5347\u6548\u7387\uff0c\u7c21\u5316\u6d41\u7a0b\uff0c\u8b93\u4fe1\u606f\u6aa2\u7d22\u66f4\u4fbf\u6377\uff01<\/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-180114","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180114","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=180114"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180114\/revisions"}],"predecessor-version":[{"id":180115,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180114\/revisions\/180115"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=180114"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=180114"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=180114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}