{"id":95358,"date":"2024-10-20T00:23:16","date_gmt":"2024-10-19T16:23:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95358\/"},"modified":"2024-10-20T00:23:16","modified_gmt":"2024-10-19T16:23:16","slug":"oracle%e5%af%a6%e7%8f%be%e5%88%86%e7%b5%84%e7%b5%b1%e8%a8%88%e8%a8%98%e9%8c%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95358\/","title":{"rendered":"Oracle\u5be6\u73fe\u5206\u7d44\u7d71\u8a08\u8a18\u9304"},"content":{"rendered":"<h1 id=\"oracle%e5%af%a6%e7%8f%be%e5%88%86%e7%b5%84%e7%b5%b1%e8%a8%88%e8%a8%98%e9%8c%84-VyPSSEFzBB\">Oracle\u5be6\u73fe\u5206\u7d44\u7d71\u8a08\u8a18\u9304<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5206\u7d44\u7d71\u8a08\u662f\u4e00\u500b\u91cd\u8981\u7684\u529f\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u5927\u91cf\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u7528\u7684\u4fe1\u606f\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u5206\u7d44\u7d71\u8a08\u8a18\u9304\uff0c\u9019\u4e9b\u65b9\u6cd5\u4e0d\u50c5\u9748\u6d3b\u800c\u4e14\u9ad8\u6548\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728Oracle\u4e2d\u4f7f\u7528\u5206\u7d44\u7d71\u8a08\u529f\u80fd\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e5%88%86%e7%b5%84%e7%b5%b1%e8%a8%88%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-VyPSSEFzBB\">\u5206\u7d44\u7d71\u8a08\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5206\u7d44\u7d71\u8a08\u662f\u6307\u6839\u64da\u67d0\u4e9b\u7279\u5b9a\u7684\u5217\u5c0d\u6578\u64da\u9032\u884c\u5206\u7d44\uff0c\u7136\u5f8c\u5c0d\u6bcf\u500b\u7d44\u9032\u884c\u7d71\u8a08\u8a08\u7b97\u3002\u9019\u4e9b\u7d71\u8a08\u8a08\u7b97\u53ef\u4ee5\u5305\u62ec\u8a08\u6578\u3001\u6c42\u548c\u3001\u5e73\u5747\u503c\u3001\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c\u7b49\u3002Oracle\u4f7f\u7528SQL\u8a9e\u8a00\u4f86\u5be6\u73fe\u9019\u4e9b\u529f\u80fd\uff0c\u4e3b\u8981\u4f9d\u8cf4\u65bc<strong>GROUP BY<\/strong>\u5b50\u53e5\u548c\u805a\u5408\u51fd\u6578\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8group-by%e5%ad%90%e5%8f%a5-VyPSSEFzBB\">\u4f7f\u7528GROUP BY\u5b50\u53e5<\/h2>\n<p>\u5728Oracle\u4e2d\uff0c<strong>GROUP BY<\/strong>\u5b50\u53e5\u7528\u65bc\u5c07\u67e5\u8a62\u7d50\u679c\u6309\u6307\u5b9a\u7684\u5217\u9032\u884c\u5206\u7d44\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT department_id, COUNT(*) AS employee_count\nFROM employees\nGROUP BY department_id;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5f9e<strong>employees<\/strong>\u8868\u4e2d\u67e5\u8a62\u6bcf\u500b\u90e8\u9580\u7684\u54e1\u5de5\u6578\u91cf\u3002\u67e5\u8a62\u7d50\u679c\u5c07\u986f\u793a\u6bcf\u500b\u90e8\u9580\u7684ID\u53ca\u5176\u5c0d\u61c9\u7684\u54e1\u5de5\u6578\u91cf\u3002<\/p>\n<h2 id=\"%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8-VyPSSEFzBB\">\u805a\u5408\u51fd\u6578\u7684\u4f7f\u7528<\/h2>\n<p>\u9664\u4e86\u8a08\u6578\uff0cOracle\u9084\u63d0\u4f9b\u4e86\u591a\u7a2e\u805a\u5408\u51fd\u6578\u4f86\u9032\u884c\u66f4\u8907\u96dc\u7684\u7d71\u8a08\u8a08\u7b97\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u805a\u5408\u51fd\u6578\uff1a<\/p>\n<ul>\n<li><strong>SUM()<\/strong>\uff1a\u8a08\u7b97\u7e3d\u548c<\/li>\n<li><strong>AVG()<\/strong>\uff1a\u8a08\u7b97\u5e73\u5747\u503c<\/li>\n<li><strong>MAX()<\/strong>\uff1a\u67e5\u627e\u6700\u5927\u503c<\/li>\n<li><strong>MIN()<\/strong>\uff1a\u67e5\u627e\u6700\u5c0f\u503c<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u805a\u5408\u51fd\u6578\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT department_id, AVG(salary) AS average_salary\nFROM employees\nGROUP BY department_id;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u90e8\u9580\u7684\u5e73\u5747\u85aa\u8cc7\u3002<\/p>\n<h2 id=\"%e5%a4%9a%e9%87%8d%e5%88%86%e7%b5%84-VyPSSEFzBB\">\u591a\u91cd\u5206\u7d44<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u6839\u64da\u591a\u500b\u5217\u9032\u884c\u5206\u7d44\u3002\u9019\u53ef\u4ee5\u901a\u904e\u5728<strong>GROUP BY<\/strong>\u5b50\u53e5\u4e2d\u5217\u51fa\u591a\u500b\u5217\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT department_id, job_id, COUNT(*) AS employee_count\nFROM employees\nGROUP BY department_id, job_id;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u90e8\u9580\u548c\u8077\u4f4d\u7684\u54e1\u5de5\u6578\u91cf\u3002<\/p>\n<h2 id=\"having%e5%ad%90%e5%8f%a5%e7%9a%84%e4%bd%bf%e7%94%a8-VyPSSEFzBB\">HAVING\u5b50\u53e5\u7684\u4f7f\u7528<\/h2>\n<p>\u5728\u9032\u884c\u5206\u7d44\u7d71\u8a08\u6642\uff0c\u60a8\u53ef\u80fd\u5e0c\u671b\u5c0d\u7d50\u679c\u9032\u884c\u904e\u6ffe\u3002\u9019\u53ef\u4ee5\u901a\u904e<strong>HAVING<\/strong>\u5b50\u53e5\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT department_id, COUNT(*) AS employee_count\nFROM employees\nGROUP BY department_id\nHAVING COUNT(*) &gt; 10;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u50c5\u8fd4\u56de\u54e1\u5de5\u6578\u91cf\u5927\u65bc10\u7684\u90e8\u9580\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-VyPSSEFzBB\">\u7d50\u8ad6<\/h2>\n<p>Oracle\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u5206\u7d44\u7d71\u8a08\u529f\u80fd\uff0c\u901a\u904e\u4f7f\u7528<strong>GROUP BY<\/strong>\u5b50\u53e5\u548c\u805a\u5408\u51fd\u6578\uff0c\u7528\u6236\u53ef\u4ee5\u8f15\u9b06\u5730\u5f9e\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u50f9\u503c\u7684\u4fe1\u606f\u3002\u7121\u8ad6\u662f\u8a08\u7b97\u54e1\u5de5\u6578\u91cf\u3001\u5e73\u5747\u85aa\u8cc7\uff0c\u9084\u662f\u9032\u884c\u591a\u91cd\u5206\u7d44\uff0cOracle\u90fd\u80fd\u5920\u9ad8\u6548\u5730\u8655\u7406\u9019\u4e9b\u9700\u6c42\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728Oracle\u4e2d\u5be6\u73fe\u5206\u7d44\u7d71\u8a08\u8a18\u9304\u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u6216\u8005\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u65b9\u6848\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u5728Oracle\u4e2d\u5be6\u73fe\u5206\u7d44\u7d71\u8a08\u8a18\u9304\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u6548\u7387\uff0c\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u52a9\u529b\u696d\u52d9\u6c7a\u7b56\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-95358","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95358","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=95358"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95358\/revisions"}],"predecessor-version":[{"id":95359,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95358\/revisions\/95359"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95358"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95358"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}