{"id":154661,"date":"2024-11-02T17:40:19","date_gmt":"2024-11-02T09:40:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/154661\/"},"modified":"2024-11-02T17:40:21","modified_gmt":"2024-11-02T09:40:21","slug":"%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%88%a9%e5%99%a8-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e9%97%9c%e8%81%af%e6%9f%a5%e8%a9%a2%ef%bc%88%e4%b8%8d%e5%90%8c%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/154661\/","title":{"rendered":"\u591a\u8868\u67e5\u8a62\u7684\u5229\u5668\u2014\u2014\u6578\u64da\u5eab\u8868\u95dc\u806f\u67e5\u8a62\uff08\u4e0d\u540c\u6578\u64da\u5eab\u8868\u95dc\u806f\u67e5\u8a62\uff09"},"content":{"rendered":"<h1 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id=\"%e9%97%9c%e8%81%af%e6%9f%a5%e8%a9%a2%e7%9a%84%e9%a1%9e%e5%9e%8b-KREERmxLgC\">\u95dc\u806f\u67e5\u8a62\u7684\u985e\u578b<\/h2>\n<p>\u95dc\u806f\u67e5\u8a62\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u5167\u90e8\u806f\u63a5\uff08INNER JOIN\uff09<\/strong>\uff1a\u53ea\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u8a18\u9304\u3002<\/li>\n<li><strong>\u5916\u90e8\u806f\u63a5\uff08OUTER JOIN\uff09<\/strong>\uff1a\u5305\u62ec\u5de6\u5916\u806f\u63a5\uff08LEFT JOIN\uff09\u3001\u53f3\u5916\u806f\u63a5\uff08RIGHT JOIN\uff09\u548c\u5168\u5916\u806f\u63a5\uff08FULL JOIN\uff09\uff0c\u9019\u4e9b\u67e5\u8a62\u6703\u8fd4\u56de\u4e00\u500b\u8868\u4e2d\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\u806f\u63a5\uff08CROSS JOIN\uff09<\/strong>\uff1a\u8fd4\u56de\u5169\u500b\u8868\u7684\u7b1b\u5361\u723e\u7a4d\uff0c\u5373\u6bcf\u500b\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u90fd\u8207\u53e6\u4e00\u500b\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u9032\u884c\u7d44\u5408\u3002<\/li>\n<li><strong>\u81ea\u806f\u63a5\uff08SELF JOIN\uff09<\/strong>\uff1a\u4e00\u500b\u8868\u8207\u81ea\u8eab\u9032\u884c\u806f\u63a5\uff0c\u901a\u5e38\u7528\u65bc\u67e5\u8a62\u8868\u4e2d\u76f8\u540c\u985e\u578b\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%97%9c%e8%81%af%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8-KREERmxLgC\">\u95dc\u806f\u67e5\u8a62\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u95dc\u806f\u67e5\u8a62\u53ef\u4ee5\u7528\u65bc\u591a\u7a2e\u5834\u666f\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u5f9e\u7528\u6236\u8868\uff08Users\uff09\u548c\u8a02\u55ae\u8868\uff08Orders\uff09\u4e2d\u7372\u53d6\u7528\u6236\u7684\u8a02\u55ae\u4fe1\u606f\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684 SQL \u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nSELECT Users.username, Orders.order_id, Orders.total_amount\nFROM Users\nINNER JOIN Orders ON Users.user_id = 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id=\"%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-KREERmxLgC\">\u6027\u80fd\u8003\u91cf<\/h2>\n<p>\u5728\u9032\u884c\u591a\u8868\u67e5\u8a62\u6642\uff0c\u6027\u80fd\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\u56e0\u7d20\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u52a0\uff0c\u67e5\u8a62\u7684\u6548\u7387\u53ef\u80fd\u6703\u53d7\u5230\u5f71\u97ff\u3002\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u9069\u7576\u7684\u7d22\u5f15\uff1a\u5728\u95dc\u806f\u7684\u5b57\u6bb5\u4e0a\u5efa\u7acb\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u3002<\/li>\n<li>\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u806f\u63a5\uff1a\u53ea\u67e5\u8a62\u9700\u8981\u7684\u8868\u548c\u5b57\u6bb5\uff0c\u6e1b\u5c11\u6578\u64da\u7684\u8655\u7406\u91cf\u3002<\/li>\n<li>\u4f7f\u7528\u9069\u7576\u7684\u67e5\u8a62\u985e\u578b\uff1a\u6839\u64da\u9700\u6c42\u9078\u64c7\u5167\u90e8\u806f\u63a5\u6216\u5916\u90e8\u806f\u63a5\uff0c\u4ee5\u7372\u5f97\u6700\u4f73\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-KREERmxLgC\">\u7d50\u8ad6<\/h2>\n<p>\u6578\u64da\u5eab\u8868\u95dc\u806f\u67e5\u8a62\u662f\u6578\u64da\u7ba1\u7406\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u80fd\u5920\u6709\u6548\u5730\u6574\u5408\u4f86\u81ea\u4e0d\u540c\u8868\u7684\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u66f4\u70ba\u8c50\u5bcc\u7684\u4fe1\u606f\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u638c\u63e1\u95dc\u806f\u67e5\u8a62\u7684\u6280\u5de7\u5c07\u5c0d\u6578\u64da\u5206\u6790\u548c\u696d\u52d9\u6c7a\u7b56\u7522\u751f\u6df1\u9060\u7684\u5f71\u97ff\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u9805\u76ee\u4e2d\u5be6\u73fe\u9ad8\u6548\u7684\u6578\u64da\u5eab\u67e5\u8a62\u6709\u8208\u8da3\uff0c\u6216\u8005\u9700\u8981\u66f4\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> 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