{"id":95424,"date":"2024-10-20T00:56:15","date_gmt":"2024-10-19T16:56:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95424\/"},"modified":"2024-10-20T00:56:16","modified_gmt":"2024-10-19T16:56:16","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%8c%e6%8a%80%e5%b7%a7%e6%8e%8c%e6%8f%a1%ef%bc%9a%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e5%af%a6%e6%88%b0%e8%a9%b3%e8%a7%a3-oracle%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95424\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\uff0c\u6280\u5de7\u638c\u63e1\uff1a\u591a\u8868\u67e5\u8a62\u5be6\u6230\u8a73\u89e3 (oracle\u6578\u64da\u5eab\u591a\u8868\u67e5\u8a62)"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%8c%e6%8a%80%e5%b7%a7%e6%8e%8c%e6%8f%a1%ef%bc%9a%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e5%af%a6%e6%88%b0%e8%a9%b3%e8%a7%a3-DVgSnLsMDy\">Oracle\u6578\u64da\u5eab\uff0c\u6280\u5de7\u638c\u63e1\uff1a\u591a\u8868\u67e5\u8a62\u5be6\u6230\u8a73\u89e3<\/h1>\n<p>\u5728\u73fe\u4ee3\u6578\u64da\u7ba1\u7406\u4e2d\uff0cOracle\u6578\u64da\u5eab\u4ee5\u5176\u5f37\u5927\u7684\u529f\u80fd\u548c\u9748\u6d3b\u6027\u800c\u53d7\u5230\u5ee3\u6cdb\u4f7f\u7528\u3002\u591a\u8868\u67e5\u8a62\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u6280\u8853\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eOracle\u6578\u64da\u5eab\u4e2d\u7684\u591a\u8868\u67e5\u8a62\u6280\u8853\uff0c\u4e26\u63d0\u4f9b\u5be6\u6230\u793a\u4f8b\uff0c\u5e6b\u52a9\u8b80\u8005\u638c\u63e1\u9019\u4e00\u6280\u5de7\u3002<\/p>\n<h2 id=\"%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-DVgSnLsMDy\">\u591a\u8868\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u591a\u8868\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500bSQL\u67e5\u8a62\u4e2d\u540c\u6642\u5f9e\u5169\u500b\u6216\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u9019\u7a2e\u67e5\u8a62\u901a\u5e38\u9700\u8981\u4f7f\u7528\u806f\u63a5\uff08JOIN\uff09\u64cd\u4f5c\uff0c\u6839\u64da\u8868\u4e4b\u9593\u7684\u95dc\u806f\u4f86\u7d44\u5408\u6578\u64da\u3002Oracle\u652f\u6301\u591a\u7a2e\u806f\u63a5\u985e\u578b\uff0c\u5305\u62ec\u5167\u806f\u63a5\uff08INNER JOIN\uff09\u3001\u5916\u806f\u63a5\uff08OUTER JOIN\uff09\u3001\u4ea4\u53c9\u806f\u63a5\uff08CROSS JOIN\uff09\u7b49\u3002<\/p>\n<h2 id=\"%e8%81%af%e6%8e%a5%e9%a1%9e%e5%9e%8b%e8%a9%b3%e8%a7%a3-DVgSnLsMDy\">\u806f\u63a5\u985e\u578b\u8a73\u89e3<\/h2>\n<h3 id=\"1-%e5%85%a7%e8%81%af%e6%8e%a5%ef%bc%88inner-join%ef%bc%89-DVgSnLsMDy\">1. \u5167\u806f\u63a5\uff08INNER JOIN\uff09<\/h3>\n<p>\u5167\u806f\u63a5\u662f\u6700\u5e38\u7528\u7684\u806f\u63a5\u985e\u578b\uff0c\u5b83\u53ea\u8fd4\u56de\u5728\u5169\u500b\u8868\u4e2d\u90fd\u6709\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u5167\u806f\u63a5\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT a.employee_id, a.name, b.department_name\nFROM employees a\nINNER JOIN departments b ON a.department_id = b.department_id;<\/code><\/pre>\n<h3 id=\"2-%e5%a4%96%e8%81%af%e6%8e%a5%ef%bc%88outer-join%ef%bc%89-DVgSnLsMDy\">2. \u5916\u806f\u63a5\uff08OUTER JOIN\uff09<\/h3>\n<p>\u5916\u806f\u63a5\u5206\u70ba\u5de6\u5916\u806f\u63a5\uff08LEFT JOIN\uff09\u548c\u53f3\u5916\u806f\u63a5\uff08RIGHT JOIN\uff09\uff0c\u5b83\u5011\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\u4ee5\u4e0b\u662f\u5de6\u5916\u806f\u63a5\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT a.employee_id, a.name, b.department_name\nFROM employees a\nLEFT JOIN departments b ON a.department_id = b.department_id;<\/code><\/pre>\n<h3 id=\"3-%e4%ba%a4%e5%8f%89%e8%81%af%e6%8e%a5%ef%bc%88cross-join%ef%bc%89-DVgSnLsMDy\">3. \u4ea4\u53c9\u806f\u63a5\uff08CROSS JOIN\uff09<\/h3>\n<p>\u4ea4\u53c9\u806f\u63a5\u6703\u8fd4\u56de\u5169\u500b\u8868\u7684\u7b1b\u5361\u723e\u7a4d\uff0c\u5373\u6bcf\u500b\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u90fd\u6703\u8207\u53e6\u4e00\u500b\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u9032\u884c\u7d44\u5408\u3002\u4ee5\u4e0b\u662f\u4ea4\u53c9\u806f\u63a5\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT a.employee_id, b.project_id\nFROM employees a\nCROSS JOIN projects b;<\/code><\/pre>\n<h2 id=\"%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%af%a6%e6%88%b0%e6%87%89%e7%94%a8-DVgSnLsMDy\">\u591a\u8868\u67e5\u8a62\u7684\u5be6\u6230\u61c9\u7528<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u591a\u8868\u67e5\u8a62\u53ef\u4ee5\u7528\u65bc\u751f\u6210\u5831\u544a\u3001\u5206\u6790\u6578\u64da\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7d9c\u5408\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u6578\u64da\u4ee5\u751f\u6210\u54e1\u5de5\u53ca\u5176\u6240\u5c6c\u90e8\u9580\u548c\u9805\u76ee\u7684\u5831\u544a\uff1a<\/p>\n<pre><code>SELECT e.employee_id, e.name, d.department_name, p.project_name\nFROM employees e\nINNER JOIN departments d ON e.department_id = d.department_id\nINNER JOIN project_assignments pa ON e.employee_id = pa.employee_id\nINNER JOIN projects p ON pa.project_id = p.project_id;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u4f4d\u54e1\u5de5\u7684ID\u3001\u59d3\u540d\u3001\u6240\u5c6c\u90e8\u9580\u540d\u7a31\u4ee5\u53ca\u53c3\u8207\u7684\u9805\u76ee\u540d\u7a31\uff0c\u5e6b\u52a9\u7ba1\u7406\u5c64\u66f4\u597d\u5730\u4e86\u89e3\u54e1\u5de5\u7684\u5de5\u4f5c\u60c5\u6cc1\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-DVgSnLsMDy\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u591a\u8868\u67e5\u8a62\u6642\uff0c\u9700\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u8868\u4e4b\u9593\u7684\u95dc\u806f\u6b63\u78ba\uff0c\u907f\u514d\u51fa\u73fe\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u91cd\u8907\u3002<\/li>\n<li>\u4f7f\u7528\u9069\u7576\u7684\u7d22\u5f15\u4f86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u6578\u64da\u96c6\u6642\u3002<\/li>\n<li>\u8003\u616e\u4f7f\u7528\u5b50\u67e5\u8a62\u6216CTE\uff08\u516c\u7528\u8868\u8868\u9054\u5f0f\uff09\u4f86\u7c21\u5316\u8907\u96dc\u67e5\u8a62\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-DVgSnLsMDy\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1Oracle\u6578\u64da\u5eab\u4e2d\u7684\u591a\u8868\u67e5\u8a62\u6280\u8853\u5c0d\u65bc\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u751f\u6210\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u4e86\u89e3\u4e0d\u540c\u7684\u806f\u63a5\u985e\u578b\u53ca\u5176\u61c9\u7528\uff0c\u60a8\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u82e5\u60a8\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u5b58\u5132\u548c\u7ba1\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1Oracle\u6578\u64da\u5eab\u591a\u8868\u67e5\u8a62\u6280\u5de7\uff0c\u6df1\u5165\u89e3\u6790\u5be6\u6230\u6848\u4f8b\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u52a9\u4f60\u6210\u70ba\u6578\u64da\u5eab\u5c08\u5bb6\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-95424","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95424","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=95424"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95424\/revisions"}],"predecessor-version":[{"id":95425,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95424\/revisions\/95425"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95424"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95424"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}