{"id":95094,"date":"2024-10-19T22:11:16","date_gmt":"2024-10-19T14:11:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95094\/"},"modified":"2024-10-19T22:11:17","modified_gmt":"2024-10-19T14:11:17","slug":"oracle%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%e7%9a%84%e4%bb%a3%e7%a2%bc%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95094\/","title":{"rendered":"Oracle\u591a\u8868\u67e5\u8a62\u512a\u5316\u7684\u4ee3\u78bc\u793a\u4f8b"},"content":{"rendered":"<h1 id=\"oracle%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%e7%9a%84%e4%bb%a3%e7%a2%bc%e7%a4%ba%e4%be%8b-sVmDsazTEq\">Oracle\u591a\u8868\u67e5\u8a62\u512a\u5316\u7684\u4ee3\u78bc\u793a\u4f8b<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u67e5\u8a62\u6027\u80fd\u7684\u512a\u5316\u662f\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u9ad8\u6548\u904b\u884c\u7684\u95dc\u9375\u3002\u7279\u5225\u662f\u5728\u4f7f\u7528Oracle\u6578\u64da\u5eab\u6642\uff0c\u5c0d\u65bc\u591a\u8868\u67e5\u8a62\u7684\u512a\u5316\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle\u591a\u8868\u67e5\u8a62\u7684\u512a\u5316\u6280\u8853\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u4ee3\u78bc\u793a\u4f8b\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\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-sVmDsazTEq\">\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\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u9019\u901a\u5e38\u6d89\u53ca\u5230\u4f7f\u7528JOIN\u8a9e\u53e5\u4f86\u9023\u63a5\u4e0d\u540c\u7684\u8868\u3002\u96d6\u7136\u591a\u8868\u67e5\u8a62\u53ef\u4ee5\u63d0\u4f9b\u8c50\u5bcc\u7684\u6578\u64da\uff0c\u4f46\u5982\u679c\u4e0d\u52a0\u4ee5\u512a\u5316\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u3002<\/p>\n<h2 id=\"%e5%84%aa%e5%8c%96%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%ad%96%e7%95%a5-sVmDsazTEq\">\u512a\u5316\u591a\u8868\u67e5\u8a62\u7684\u7b56\u7565<\/h2>\n<ul>\n<li><strong>\u9078\u64c7\u5408\u9069\u7684JOIN\u985e\u578b\uff1a<\/strong>\u6839\u64da\u9700\u6c42\u9078\u64c7INNER JOIN\u3001LEFT JOIN\u6216RIGHT JOIN\u7b49\u4e0d\u540c\u7684JOIN\u985e\u578b\uff0c\u4ee5\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u6aa2\u7d22\u3002<\/li>\n<li><strong>\u4f7f\u7528\u7d22\u5f15\uff1a<\/strong>\u70ba\u67e5\u8a62\u4e2d\u6d89\u53ca\u7684\u5217\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u7279\u5225\u662f\u5728JOIN\u64cd\u4f5c\u4e2d\uff0c\u7d22\u5f15\u80fd\u5920\u52a0\u901f\u6578\u64da\u7684\u6aa2\u7d22\u3002<\/li>\n<li><strong>\u907f\u514dSELECT *\uff1a<\/strong>\u5728\u67e5\u8a62\u4e2d\u660e\u78ba\u6307\u5b9a\u9700\u8981\u7684\u5217\uff0c\u800c\u4e0d\u662f\u4f7f\u7528SELECT *\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u7684\u8ca0\u64d4\u3002<\/li>\n<li><strong>\u4f7f\u7528\u5b50\u67e5\u8a62\u548cCTE\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u5b50\u67e5\u8a62\u6216\u516c\u7528\u8868\u8868\u9054\u5f0f\uff08CTE\uff09\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u53ef\u8b80\u6027\u548c\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bb%a3%e7%a2%bc%e7%a4%ba%e4%be%8b-sVmDsazTEq\">\u4ee3\u78bc\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u591a\u8868\u67e5\u8a62\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528INNER JOIN\u4f86\u9023\u63a5\u5169\u500b\u8868\uff0c\u4e26\u9032\u884c\u6027\u80fd\u512a\u5316\u3002<\/p>\n<pre><code>SELECT \n    e.employee_id, \n    e.first_name, \n    e.last_name, \n    d.department_name \nFROM \n    employees e \nINNER JOIN \n    departments d \nON \n    e.department_id = d.department_id \nWHERE \n    d.location_id = 1000;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u5f9e\u54e1\u5de5\u8868\uff08employees\uff09\u548c\u90e8\u9580\u8868\uff08departments\uff09\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u901a\u904eINNER JOIN\uff0c\u6211\u5011\u53ea\u7372\u53d6\u90a3\u4e9b\u5728\u7279\u5b9a\u5730\u9ede\uff08location_id = 1000\uff09\u7684\u90e8\u9580\u7684\u54e1\u5de5\u4fe1\u606f\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95%e7%9a%84%e7%a4%ba%e4%be%8b-sVmDsazTEq\">\u4f7f\u7528\u7d22\u5f15\u7684\u793a\u4f8b<\/h3>\n<p>\u70ba\u4e86\u9032\u4e00\u6b65\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u6211\u5011\u53ef\u4ee5\u70ba\u90e8\u9580ID\u548c\u4f4d\u7f6eID\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_department_id ON employees(department_id);\nCREATE INDEX idx_location_id ON departments(location_id);<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u5728\u57f7\u884c\u67e5\u8a62\u6642\uff0cOracle\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u76f8\u95dc\u7684\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e5%85%ac%e7%94%a8%e8%a1%a8%e8%a1%a8%e9%81%94%e5%bc%8f%ef%bc%88cte%ef%bc%89%e7%9a%84%e7%a4%ba%e4%be%8b-sVmDsazTEq\">\u4f7f\u7528\u516c\u7528\u8868\u8868\u9054\u5f0f\uff08CTE\uff09\u7684\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528CTE\u7684\u793a\u4f8b\uff0c\u9019\u6a23\u53ef\u4ee5\u4f7f\u67e5\u8a62\u66f4\u5177\u53ef\u8b80\u6027\uff1a<\/p>\n<pre><code>WITH dept_employees AS (\n    SELECT \n        e.employee_id, \n        e.first_name, \n        e.last_name, \n        e.department_id \n    FROM \n        employees e \n    WHERE \n        e.department_id IN (SELECT department_id FROM departments WHERE location_id = 1000)\n)\nSELECT \n    d.department_name, \n    de.first_name, \n    de.last_name \nFROM \n    dept_employees de \nINNER JOIN \n    departments d \nON \n    de.department_id = d.department_id;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u9996\u5148\u4f7f\u7528CTE\u9078\u64c7\u7b26\u5408\u689d\u4ef6\u7684\u54e1\u5de5\uff0c\u7136\u5f8c\u518d\u8207\u90e8\u9580\u8868\u9032\u884cJOIN\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u7d50\u69cb\u6027\u548c\u53ef\u8b80\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-sVmDsazTEq\">\u7e3d\u7d50<\/h2>\n<p>\u512a\u5316Oracle\u591a\u8868\u67e5\u8a62\u662f\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\uff0c\u901a\u904e\u9078\u64c7\u5408\u9069\u7684JOIN\u985e\u578b\u3001\u4f7f\u7528\u7d22\u5f15\u3001\u907f\u514dSELECT *\u4ee5\u53ca\u5229\u7528\u5b50\u67e5\u8a62\u548cCTE\u7b49\u6280\u8853\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u80fd\u5920\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u7684\u901f\u5ea6\uff0c\u9084\u80fd\u6539\u5584\u6574\u9ad4\u7cfb\u7d71\u7684\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u5be6\u73fe\u6700\u4f73\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u591a\u8868\u67e5\u8a62\u512a\u5316\u7684\u4ee3\u78bc\u793a\u4f8b\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u6e1b\u5c11\u57f7\u884c\u6642\u9593\uff0c\u5be6\u73fe\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\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-95094","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95094","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=95094"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95094\/revisions"}],"predecessor-version":[{"id":95095,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95094\/revisions\/95095"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95094"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95094"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95094"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}