{"id":96280,"date":"2024-10-20T08:06:16","date_gmt":"2024-10-20T00:06:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96280\/"},"modified":"2024-10-20T08:06:17","modified_gmt":"2024-10-20T00:06:17","slug":"oracle%e5%ad%90%e6%9f%a5%e8%a9%a2%e9%81%8e%e7%a8%8b%e4%b8%ad%e5%80%bc%e5%be%97%e6%b3%a8%e6%84%8f%e7%9a%84%e4%ba%8b%e9%a0%85","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96280\/","title":{"rendered":"Oracle\u5b50\u67e5\u8a62\u904e\u7a0b\u4e2d\u503c\u5f97\u6ce8\u610f\u7684\u4e8b\u9805"},"content":{"rendered":"<h1 id=\"oracle%e5%ad%90%e6%9f%a5%e8%a9%a2%e9%81%8e%e7%a8%8b%e4%b8%ad%e5%80%bc%e5%be%97%e6%b3%a8%e6%84%8f%e7%9a%84%e4%ba%8b%e9%a0%85-uqZiFEtUPW\">Oracle\u5b50\u67e5\u8a62\u904e\u7a0b\u4e2d\u503c\u5f97\u6ce8\u610f\u7684\u4e8b\u9805<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cOracle\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u9078\u64c7\uff0c\u5c24\u5176\u662f\u5728\u8655\u7406\u8907\u96dc\u67e5\u8a62\u6642\u3002\u5b50\u67e5\u8a62\uff08Subquery\uff09\u662fOracle SQL\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728\u67e5\u8a62\u4e2d\u5d4c\u5957\u5176\u4ed6\u67e5\u8a62\uff0c\u4ee5\u7372\u53d6\u66f4\u7cbe\u78ba\u7684\u6578\u64da\u3002\u7136\u800c\uff0c\u5728\u4f7f\u7528\u5b50\u67e5\u8a62\u6642\uff0c\u6709\u5e7e\u500b\u503c\u5f97\u6ce8\u610f\u7684\u4e8b\u9805\uff0c\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e9b\u8981\u9ede\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%ad%90%e6%9f%a5%e8%a9%a2%ef%bc%9f-uqZiFEtUPW\">\u4ec0\u9ebc\u662f\u5b50\u67e5\u8a62\uff1f<\/h2>\n<p>\u5b50\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500bSQL\u67e5\u8a62\u4e2d\u5d4c\u5957\u7684\u53e6\u4e00\u500b\u67e5\u8a62\u3002\u5b83\u53ef\u4ee5\u51fa\u73fe\u5728SELECT\u3001INSERT\u3001UPDATE\u6216DELETE\u8a9e\u53e5\u4e2d\u3002\u5b50\u67e5\u8a62\u7684\u7d50\u679c\u53ef\u4ee5\u7528\u4f86\u904e\u6ffe\u4e3b\u67e5\u8a62\u7684\u7d50\u679c\uff0c\u6216\u4f5c\u70ba\u8a08\u7b97\u7684\u4f9d\u64da\u3002<\/p>\n<h2 id=\"%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e9%a1%9e%e5%9e%8b-uqZiFEtUPW\">\u5b50\u67e5\u8a62\u7684\u985e\u578b<\/h2>\n<ul>\n<li><strong>\u55ae\u884c\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u55ae\u4e00\u884c\u7684\u7d50\u679c\uff0c\u901a\u5e38\u7528\u65bc\u6bd4\u8f03\u3002<\/li>\n<li><strong>\u591a\u884c\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u591a\u884c\u7684\u7d50\u679c\uff0c\u901a\u5e38\u7528\u65bcIN\u6216ANY\u7b49\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u76f8\u95dc\u5b50\u67e5\u8a62\uff1a<\/strong>\u4f9d\u8cf4\u65bc\u5916\u90e8\u67e5\u8a62\u7684\u7d50\u679c\uff0c\u901a\u5e38\u5728WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528\u3002<\/li>\n<li><strong>\u975e\u76f8\u95dc\u5b50\u67e5\u8a62\uff1a<\/strong>\u7368\u7acb\u65bc\u5916\u90e8\u67e5\u8a62\uff0c\u80fd\u5920\u7368\u7acb\u57f7\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-uqZiFEtUPW\">\u4f7f\u7528\u5b50\u67e5\u8a62\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<h3 id=\"1-%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-uqZiFEtUPW\">1. \u6027\u80fd\u8003\u91cf<\/h3>\n<p>\u5b50\u67e5\u8a62\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u7684\u6027\u80fd\uff0c\u7279\u5225\u662f\u7576\u5b50\u67e5\u8a62\u8fd4\u56de\u5927\u91cf\u6578\u64da\u6642\u3002\u70ba\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528JOIN\u64cd\u4f5c\u4f86\u66ff\u4ee3\u5b50\u67e5\u8a62\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT e.employee_id, e.first_name\nFROM employees e\nWHERE e.department_id IN (SELECT d.department_id FROM departments d WHERE d.location_id = 1000);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u4f7f\u7528JOIN\u53ef\u80fd\u6703\u66f4\u6709\u6548\u7387\uff1a<\/p>\n<pre><code>SELECT e.employee_id, e.first_name\nFROM employees e\nJOIN departments d ON e.department_id = d.department_id\nWHERE d.location_id = 1000;\n<\/code><\/pre>\n<h3 id=\"2-%e5%8f%af%e8%ae%80%e6%80%a7-uqZiFEtUPW\">2. \u53ef\u8b80\u6027<\/h3>\n<p>\u904e\u591a\u7684\u5b50\u67e5\u8a62\u53ef\u80fd\u6703\u4f7fSQL\u8a9e\u53e5\u8b8a\u5f97\u96e3\u4ee5\u95b1\u8b80\u548c\u7dad\u8b77\u3002\u5efa\u8b70\u5728\u5fc5\u8981\u6642\u4f7f\u7528\u5b50\u67e5\u8a62\uff0c\u4e26\u4fdd\u6301\u67e5\u8a62\u7684\u7c21\u6f54\u6027\u3002\u9069\u7576\u7684\u683c\u5f0f\u5316\u548c\u8a3b\u89e3\u53ef\u4ee5\u63d0\u9ad8\u53ef\u8b80\u6027\u3002<\/p>\n<h3 id=\"3-%e9%8c%af%e8%aa%a4%e8%99%95%e7%90%86-uqZiFEtUPW\">3. \u932f\u8aa4\u8655\u7406<\/h3>\n<p>\u5728\u4f7f\u7528\u5b50\u67e5\u8a62\u6642\uff0c\u9700\u6ce8\u610f\u53ef\u80fd\u51fa\u73fe\u7684\u932f\u8aa4\u3002\u4f8b\u5982\uff0c\u7576\u5b50\u67e5\u8a62\u8fd4\u56deNULL\u503c\u6642\uff0c\u4e3b\u67e5\u8a62\u53ef\u80fd\u7121\u6cd5\u6b63\u78ba\u57f7\u884c\u3002\u4f7f\u7528COALESCE\u51fd\u6578\u53ef\u4ee5\u907f\u514d\u9019\u7a2e\u60c5\u6cc1\uff1a<\/p>\n<pre><code>SELECT employee_id, first_name\nFROM employees\nWHERE department_id = COALESCE((SELECT department_id FROM departments WHERE location_id = 1000), -1);\n<\/code><\/pre>\n<h3 id=\"4-%e5%b5%8c%e5%a5%97%e5%b1%a4%e7%b4%9a-uqZiFEtUPW\">4. \u5d4c\u5957\u5c64\u7d1a<\/h3>\n<p>Oracle\u5c0d\u5b50\u67e5\u8a62\u7684\u5d4c\u5957\u5c64\u7d1a\u6709\u4e00\u5b9a\u7684\u9650\u5236\uff0c\u901a\u5e38\u4e0d\u5efa\u8b70\u8d85\u904e\u4e09\u5c64\u5d4c\u5957\u3002\u904e\u591a\u7684\u5d4c\u5957\u6703\u5c0e\u81f4\u67e5\u8a62\u6027\u80fd\u4e0b\u964d\uff0c\u4e26\u589e\u52a0\u51fa\u932f\u7684\u98a8\u96aa\u3002<\/p>\n<h3 id=\"5-%e4%bd%bf%e7%94%a8exists%e5%92%8cnot-exists-uqZiFEtUPW\">5. \u4f7f\u7528EXISTS\u548cNOT EXISTS<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528EXISTS\u6216NOT EXISTS\u6bd4\u4f7f\u7528IN\u66f4\u6709\u6548\u7387\u3002EXISTS\u6703\u5728\u627e\u5230\u7b2c\u4e00\u500b\u5339\u914d\u7684\u884c\u5f8c\u505c\u6b62\u67e5\u8a62\uff0c\u800cIN\u5247\u6703\u6aa2\u67e5\u6240\u6709\u7684\u884c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT employee_id, first_name\nFROM employees e\nWHERE EXISTS (SELECT 1 FROM departments d WHERE e.department_id = d.department_id AND d.location_id = 1000);\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-uqZiFEtUPW\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u4e2d\u4f7f\u7528\u5b50\u67e5\u8a62\u6642\uff0c\u9700\u8003\u616e\u6027\u80fd\u3001\u53ef\u8b80\u6027\u3001\u932f\u8aa4\u8655\u7406\u3001\u5d4c\u5957\u5c64\u7d1a\u53ca\u4f7f\u7528EXISTS\u7b49\u56e0\u7d20\u3002\u9019\u4e9b\u6ce8\u610f\u4e8b\u9805\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u64b0\u5bebSQL\u67e5\u8a62\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u512a\u5316\u60a8\u7684\u6578\u64da\u5eab\u67e5\u8a62\uff0c\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u5b50\u67e5\u8a62\u904e\u7a0b\u4e2d\u7684\u95dc\u9375\u6ce8\u610f\u4e8b\u9805\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u8207\u6027\u80fd\uff0c\u907f\u514d\u5e38\u898b\u932f\u8aa4\uff0c\u512a\u5316\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-96280","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96280","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=96280"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96280\/revisions"}],"predecessor-version":[{"id":96281,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96280\/revisions\/96281"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96280"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96280"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}