{"id":94282,"date":"2024-10-19T19:00:20","date_gmt":"2024-10-19T11:00:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94282\/"},"modified":"2024-10-19T19:00:20","modified_gmt":"2024-10-19T11:00:20","slug":"oracle-sql%ef%bc%9a%e7%b6%93%e5%85%b8%e6%9f%a5%e8%a9%a2%e7%b7%b4%e6%89%8b%e7%ac%ac%e4%ba%8c%e7%af%87","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94282\/","title":{"rendered":"Oracle SQL\uff1a\u7d93\u5178\u67e5\u8a62\u7df4\u624b\u7b2c\u4e8c\u7bc7"},"content":{"rendered":"<h1 id=\"oracle-sql%ef%bc%9a%e7%b6%93%e5%85%b8%e6%9f%a5%e8%a9%a2%e7%b7%b4%e6%89%8b%e7%ac%ac%e4%ba%8c%e7%af%87-goKFvggQTU\">Oracle SQL\uff1a\u7d93\u5178\u67e5\u8a62\u7df4\u624b\u7b2c\u4e8c\u7bc7<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u6700\u5e38\u7528\u7684\u8a9e\u8a00\u4e4b\u4e00\u3002Oracle SQL \u4f5c\u70ba\u4e00\u7a2e\u5f37\u5927\u7684\u6578\u64da\u5eab\u67e5\u8a62\u5de5\u5177\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u8655\u7406\u548c\u5206\u6790\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u4e00\u4e9b\u7d93\u5178\u7684\u67e5\u8a62\u6280\u5de7\uff0c\u5e6b\u52a9\u8b80\u8005\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u66f4\u597d\u5730\u638c\u63e1 Oracle SQL\u3002<\/p>\n<h2 id=\"1-%e5%9f%ba%e6%9c%ac%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-goKFvggQTU\">1. \u57fa\u672c\u67e5\u8a62\u8a9e\u53e5<\/h2>\n<p>\u5728 Oracle SQL \u4e2d\uff0c\u6700\u57fa\u672c\u7684\u67e5\u8a62\u8a9e\u53e5\u662f <code>SELECT<\/code> \u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u7528\u65bc\u5f9e\u6578\u64da\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM employees;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de <code>employees<\/code> \u8868\u4e2d\u7684\u6240\u6709\u5217\u548c\u6240\u6709\u884c\u3002\u7576\u7136\uff0c\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6211\u5011\u901a\u5e38\u6703\u6839\u64da\u9700\u8981\u9078\u64c7\u7279\u5b9a\u7684\u5217\uff1a<\/p>\n<pre><code>SELECT first_name, last_name FROM employees;<\/code><\/pre>\n<h2 id=\"2-%e4%bd%bf%e7%94%a8%e6%a2%9d%e4%bb%b6%e9%81%8e%e6%bf%be%e6%95%b8%e6%93%9a-goKFvggQTU\">2. \u4f7f\u7528\u689d\u4ef6\u904e\u6ffe\u6578\u64da<\/h2>\n<p>\u5728\u67e5\u8a62\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u904e\u6ffe\u6578\u64da\u3002\u9019\u53ef\u4ee5\u901a\u904e <code>WHERE<\/code> \u5b50\u53e5\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u6240\u6709\u85aa\u6c34\u9ad8\u65bc 50000 \u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE salary &gt; 50000;<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u9084\u53ef\u4ee5\u4f7f\u7528\u908f\u8f2f\u904b\u7b97\u7b26\uff08\u5982 <code>AND<\/code> \u548c <code>OR<\/code>\uff09\u4f86\u7d44\u5408\u591a\u500b\u689d\u4ef6\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE salary &gt; 50000 AND department_id = 10;<\/code><\/pre>\n<h2 id=\"3-%e6%8e%92%e5%ba%8f%e6%9f%a5%e8%a9%a2%e7%b5%90%e6%9e%9c-goKFvggQTU\">3. \u6392\u5e8f\u67e5\u8a62\u7d50\u679c<\/h2>\n<p>\u67e5\u8a62\u7d50\u679c\u7684\u6392\u5e8f\u53ef\u4ee5\u901a\u904e <code>ORDER BY<\/code> \u5b50\u53e5\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u793a\u4f8b\u5c07\u6839\u64da\u85aa\u6c34\u5c0d\u54e1\u5de5\u9032\u884c\u964d\u5e8f\u6392\u5e8f\uff1a<\/p>\n<pre><code>SELECT * FROM employees ORDER BY salary DESC;<\/code><\/pre>\n<p>\u5982\u679c\u9700\u8981\u6309\u591a\u500b\u5217\u6392\u5e8f\uff0c\u53ef\u4ee5\u5728 <code>ORDER BY<\/code> \u5b50\u53e5\u4e2d\u5217\u51fa\u591a\u500b\u5217\u540d\uff1a<\/p>\n<pre><code>SELECT * FROM employees ORDER BY department_id, salary DESC;<\/code><\/pre>\n<h2 id=\"4-%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8-goKFvggQTU\">4. \u805a\u5408\u51fd\u6578\u7684\u4f7f\u7528<\/h2>\n<p>Oracle SQL \u63d0\u4f9b\u4e86\u591a\u7a2e\u805a\u5408\u51fd\u6578\uff0c\u5982 <code>COUNT<\/code>\u3001<code>SUM<\/code>\u3001<code>AVG<\/code>\u3001<code>MIN<\/code> \u548c <code>MAX<\/code>\uff0c\u7528\u65bc\u8a08\u7b97\u6578\u64da\u7684\u7d71\u8a08\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u8a08\u7b97\u6240\u6709\u54e1\u5de5\u7684\u7e3d\u85aa\u6c34\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>SELECT SUM(salary) FROM employees;<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u9084\u53ef\u4ee5\u4f7f\u7528 <code>GROUP BY<\/code> \u5b50\u53e5\u4f86\u5c0d\u6578\u64da\u9032\u884c\u5206\u7d44\uff0c\u4e26\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u5e73\u5747\u85aa\u6c34\uff1a<\/p>\n<pre><code>SELECT department_id, AVG(salary) FROM employees GROUP BY department_id;<\/code><\/pre>\n<h2 id=\"5-%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e4%bd%bf%e7%94%a8-goKFvggQTU\">5. \u5b50\u67e5\u8a62\u7684\u4f7f\u7528<\/h2>\n<p>\u5b50\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u5d4c\u5957\u53e6\u4e00\u500b\u67e5\u8a62\u3002\u9019\u5728\u9700\u8981\u6839\u64da\u5176\u4ed6\u67e5\u8a62\u7684\u7d50\u679c\u9032\u884c\u904e\u6ffe\u6642\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u85aa\u6c34\u9ad8\u65bc\u6240\u6709\u54e1\u5de5\u5e73\u5747\u85aa\u6c34\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE salary &gt; (SELECT AVG(salary) FROM employees);<\/code><\/pre>\n<h2 id=\"6-%e7%b5%90%e5%90%88%e6%9f%a5%e8%a9%a2-goKFvggQTU\">6. \u7d50\u5408\u67e5\u8a62<\/h2>\n<p>\u5728 Oracle SQL \u4e2d\uff0c\u7d50\u5408\u67e5\u8a62\u53ef\u4ee5\u901a\u904e <code>JOIN<\/code> \u4f86\u5be6\u73fe\uff0c\u9019\u4f7f\u5f97\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u8b8a\u5f97\u66f4\u52a0\u65b9\u4fbf\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u6bcf\u4f4d\u54e1\u5de5\u53ca\u5176\u6240\u5c6c\u90e8\u9580\u7684\u540d\u7a31\uff0c\u53ef\u4ee5\u4f7f\u7528\u5167\u90e8\u9023\u63a5\uff1a<\/p>\n<pre><code>SELECT e.first_name, e.last_name, d.department_name \nFROM employees e \nJOIN departments d ON e.department_id = d.department_id;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-goKFvggQTU\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1 Oracle SQL \u7684\u57fa\u672c\u67e5\u8a62\u6280\u5de7\u5c0d\u65bc\u6578\u64da\u5206\u6790\u548c\u7ba1\u7406\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528\u57fa\u672c\u67e5\u8a62\u3001\u904e\u6ffe\u6578\u64da\u3001\u6392\u5e8f\u7d50\u679c\u3001\u4f7f\u7528\u805a\u5408\u51fd\u6578\u3001\u5b50\u67e5\u8a62\u548c\u7d50\u5408\u67e5\u8a62\uff0c\u60a8\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u8655\u7406\u548c\u5206\u6790\u6578\u64da\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u6280\u8853\u652f\u6301\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u96a8\u6642\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle SQL\u7684\u7d93\u5178\u67e5\u8a62\u6280\u5de7\uff0c\u63d0\u5347\u4f60\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u638c\u63e1\u5be6\u7528\u7bc4\u4f8b\uff0c\u8b93\u67e5\u8a62\u66f4\u9ad8\u6548\uff01<\/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-94282","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94282","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=94282"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94282\/revisions"}],"predecessor-version":[{"id":94283,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94282\/revisions\/94283"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94282"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94282"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94282"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}