{"id":187776,"date":"2024-11-11T17:05:20","date_gmt":"2024-11-11T09:05:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187776\/"},"modified":"2024-11-11T17:05:21","modified_gmt":"2024-11-11T09:05:21","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e8%87%aa%e7%84%b6%e9%80%a3%e6%8e%a5%e7%b0%a1%e4%bb%8b-%e6%95%b8%e6%93%9a%e5%ba%ab-%e8%87%aa%e7%84%b6%e9%80%a3%e6%8e%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187776\/","title":{"rendered":"\u6578\u64da\u5eab\u4e2d\u7684\u81ea\u7136\u9023\u63a5\u7c21\u4ecb (\u6578\u64da\u5eab \u81ea\u7136\u9023\u63a5)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e8%87%aa%e7%84%b6%e9%80%a3%e6%8e%a5%e7%b0%a1%e4%bb%8b-pGygsAIvYk\">\u6578\u64da\u5eab\u4e2d\u7684\u81ea\u7136\u9023\u63a5\u7c21\u4ecb<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u81ea\u7136\u9023\u63a5\uff08Natural Join\uff09\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u67e5\u8a62\u64cd\u4f5c\uff0c\u4e3b\u8981\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u76f8\u95dc\u6578\u64da\u3002\u81ea\u7136\u9023\u63a5\u7684\u7279\u9ede\u5728\u65bc\uff0c\u5b83\u81ea\u52d5\u6839\u64da\u8868\u4e2d\u540c\u540d\u7684\u5217\u9032\u884c\u9023\u63a5\uff0c\u9019\u4f7f\u5f97\u67e5\u8a62\u904e\u7a0b\u66f4\u52a0\u7c21\u4fbf\u548c\u9ad8\u6548\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u81ea\u7136\u9023\u63a5\u7684\u6982\u5ff5\u3001\u4f7f\u7528\u65b9\u6cd5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u512a\u7f3a\u9ede\u3002<\/p>\n<h2 id=\"%e8%87%aa%e7%84%b6%e9%80%a3%e6%8e%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-pGygsAIvYk\">\u81ea\u7136\u9023\u63a5\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u81ea\u7136\u9023\u63a5\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u9023\u63a5\u985e\u578b\uff0c\u7576\u5169\u500b\u6216\u591a\u500b\u8868\u4e2d\u5b58\u5728\u540c\u540d\u7684\u5217\u6642\uff0c\u81ea\u7136\u9023\u63a5\u6703\u81ea\u52d5\u4f7f\u7528\u9019\u4e9b\u540c\u540d\u5217\u4f5c\u70ba\u9023\u63a5\u689d\u4ef6\u3002\u9019\u610f\u5473\u8457\uff0c\u4f7f\u7528\u81ea\u7136\u9023\u63a5\u6642\uff0c\u7121\u9700\u660e\u78ba\u6307\u5b9a\u9023\u63a5\u689d\u4ef6\uff0c\u6578\u64da\u5eab\u7cfb\u7d71\u6703\u81ea\u52d5\u8b58\u5225\u4e26\u8655\u7406\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u8003\u616e\u4ee5\u4e0b\u5169\u500b\u8868\uff1a<\/p>\n<ul>\n<li><strong>\u5b78\u751f\u8868\uff08Students\uff09<\/strong>\n<ul>\n<li>\u5b78\u751fID\uff08StudentID\uff09<\/li>\n<li>\u59d3\u540d\uff08Name\uff09<\/li>\n<li>\u5e74\u9f61\uff08Age\uff09<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u6210\u7e3e\u8868\uff08Grades\uff09<\/strong>\n<ul>\n<li>\u5b78\u751fID\uff08StudentID\uff09<\/li>\n<li>\u79d1\u76ee\uff08Subject\uff09<\/li>\n<li>\u6210\u7e3e\uff08Score\uff09<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5169\u500b\u8868\u90fd\u6709\u201c\u5b78\u751fID\u201d\u9019\u4e00\u5217\u3002\u4f7f\u7528\u81ea\u7136\u9023\u63a5\u6642\uff0c\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u7372\u53d6\u5b78\u751f\u7684\u59d3\u540d\u53ca\u5176\u6210\u7e3e\uff1a<\/p>\n<pre><code>SELECT * FROM Students NATURAL JOIN Grades;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u81ea\u52d5\u6839\u64da\u201c\u5b78\u751fID\u201d\u9032\u884c\u9023\u63a5\uff0c\u8fd4\u56de\u6240\u6709\u5b78\u751f\u7684\u59d3\u540d\u53ca\u5176\u5c0d\u61c9\u7684\u6210\u7e3e\u3002<\/p>\n<h2 id=\"%e8%87%aa%e7%84%b6%e9%80%a3%e6%8e%a5%e7%9a%84%e5%84%aa%e9%bb%9e-pGygsAIvYk\">\u81ea\u7136\u9023\u63a5\u7684\u512a\u9ede<\/h2>\n<ul>\n<li><strong>\u7c21\u5316\u67e5\u8a62\u8a9e\u53e5\uff1a<\/strong>\u7531\u65bc\u4e0d\u9700\u8981\u660e\u78ba\u6307\u5b9a\u9023\u63a5\u689d\u4ef6\uff0c\u81ea\u7136\u9023\u63a5\u4f7f\u5f97SQL\u67e5\u8a62\u8a9e\u53e5\u66f4\u52a0\u7c21\u6f54\u3002<\/li>\n<li><strong>\u6e1b\u5c11\u932f\u8aa4\uff1a<\/strong>\u81ea\u52d5\u8b58\u5225\u540c\u540d\u5217\u53ef\u4ee5\u6e1b\u5c11\u56e0\u624b\u52d5\u6307\u5b9a\u9023\u63a5\u689d\u4ef6\u800c\u7522\u751f\u7684\u932f\u8aa4\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u53ef\u8b80\u6027\uff1a<\/strong>\u81ea\u7136\u9023\u63a5\u7684\u8a9e\u6cd5\u7c21\u55ae\u660e\u4e86\uff0c\u4fbf\u65bc\u5176\u4ed6\u958b\u767c\u8005\u7406\u89e3\u67e5\u8a62\u7684\u610f\u5716\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%87%aa%e7%84%b6%e9%80%a3%e6%8e%a5%e7%9a%84%e7%bc%ba%e9%bb%9e-pGygsAIvYk\">\u81ea\u7136\u9023\u63a5\u7684\u7f3a\u9ede<\/h2>\n<ul>\n<li><strong>\u96b1\u5f0f\u9023\u63a5\u689d\u4ef6\uff1a<\/strong>\u81ea\u7136\u9023\u63a5\u4f9d\u8cf4\u65bc\u540c\u540d\u5217\uff0c\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u5c0e\u81f4\u610f\u5916\u7684\u7d50\u679c\uff0c\u7279\u5225\u662f\u7576\u8868\u4e2d\u6709\u591a\u500b\u540c\u540d\u5217\u6642\u3002<\/li>\n<li><strong>\u9748\u6d3b\u6027\u4e0d\u8db3\uff1a<\/strong>\u5728\u9700\u8981\u66f4\u8907\u96dc\u7684\u9023\u63a5\u689d\u4ef6\u6642\uff0c\u81ea\u7136\u9023\u63a5\u53ef\u80fd\u7121\u6cd5\u6eff\u8db3\u9700\u6c42\uff0c\u9019\u6642\u9700\u8981\u4f7f\u7528\u5176\u4ed6\u985e\u578b\u7684\u9023\u63a5\uff0c\u5982\u5167\u90e8\u9023\u63a5\uff08INNER JOIN\uff09\u6216\u5916\u90e8\u9023\u63a5\uff08OUTER JOIN\uff09\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%87%aa%e7%84%b6%e9%80%a3%e6%8e%a5%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8-pGygsAIvYk\">\u81ea\u7136\u9023\u63a5\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n<p>\u81ea\u7136\u9023\u63a5\u5728\u8a31\u591a\u5be6\u969b\u61c9\u7528\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u826f\u597d\u4e14\u8868\u4e4b\u9593\u6709\u660e\u78ba\u95dc\u806f\u7684\u60c5\u6cc1\u4e0b\u3002\u8209\u4f8b\u4f86\u8aaa\uff0c\u5728\u5b78\u6821\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u5b78\u751f\u8868\u548c\u6210\u7e3e\u8868\u4e4b\u9593\u7684\u81ea\u7136\u9023\u63a5\u53ef\u4ee5\u5feb\u901f\u7372\u53d6\u5b78\u751f\u7684\u5b78\u696d\u8868\u73fe\uff0c\u5e6b\u52a9\u6559\u5e2b\u548c\u7ba1\u7406\u8005\u505a\u51fa\u66f4\u597d\u7684\u6c7a\u7b56\u3002<\/p>\n<p>\u7136\u800c\uff0c\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u61c9\u8b39\u614e\u4f7f\u7528\u81ea\u7136\u9023\u63a5\uff0c\u78ba\u4fdd\u8868\u4e2d\u7684\u540c\u540d\u5217\u78ba\u5be6\u4ee3\u8868\u76f8\u540c\u7684\u6578\u64da\uff0c\u4e26\u4e14\u4e0d\u6703\u5f15\u8d77\u6df7\u6dc6\u6216\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-pGygsAIvYk\">\u7e3d\u7d50<\/h2>\n<p>\u81ea\u7136\u9023\u63a5\u662f\u4e00\u7a2e\u4fbf\u6377\u7684\u6578\u64da\u5eab\u67e5\u8a62\u65b9\u5f0f\uff0c\u80fd\u5920\u81ea\u52d5\u6839\u64da\u540c\u540d\u5217\u9032\u884c\u9023\u63a5\uff0c\u7c21\u5316\u67e5\u8a62\u8a9e\u53e5\u4e26\u63d0\u9ad8\u53ef\u8b80\u6027\u3002\u7136\u800c\uff0c\u5b83\u4e5f\u5b58\u5728\u4e00\u4e9b\u6f5b\u5728\u7684\u7f3a\u9ede\uff0c\u5982\u96b1\u5f0f\u9023\u63a5\u689d\u4ef6\u53ef\u80fd\u5c0e\u81f4\u610f\u5916\u7d50\u679c\u3002\u56e0\u6b64\uff0c\u5728\u4f7f\u7528\u81ea\u7136\u9023\u63a5\u6642\uff0c\u958b\u767c\u8005\u61c9\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\u9078\u64c7\u5408\u9069\u7684\u9023\u63a5\u65b9\u5f0f\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u53ef\u4ee5\u9032\u4e00\u6b65\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\uff0c\u78ba\u4fdd\u7cfb\u7d71\u7684\u7a69\u5b9a\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u6578\u64da\u5eab\u4e2d\u7684\u81ea\u7136\u9023\u63a5\uff0c\u63a2\u7d22\u5176\u5b9a\u7fa9\u3001\u7279\u9ede\u53ca\u5728\u6578\u64da\u67e5\u8a62\u4e2d\u7684\u61c9\u7528\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-187776","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187776","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=187776"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187776\/revisions"}],"predecessor-version":[{"id":187777,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187776\/revisions\/187777"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=187776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=187776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=187776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}