{"id":93970,"date":"2024-10-19T18:27:19","date_gmt":"2024-10-19T10:27:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/93970\/"},"modified":"2024-10-19T18:27:20","modified_gmt":"2024-10-19T10:27:20","slug":"oracle-over%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8%e5%af%a6%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/93970\/","title":{"rendered":"Oracle over()\u51fd\u6578\u7684\u4f7f\u7528\u5be6\u4f8b"},"content":{"rendered":"<h1 id=\"oracle-over%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8%e5%af%a6%e4%be%8b-mUScRKoewI\">Oracle over()\u51fd\u6578\u7684\u4f7f\u7528\u5be6\u4f8b<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cOracle\u7684<code>OVER()<\/code>\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5728\u67e5\u8a62\u4e2d\u9032\u884c\u7a97\u53e3\u51fd\u6578\u8a08\u7b97\u3002\u9019\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u5728\u4e0d\u9700\u8981\u4f7f\u7528\u5b50\u67e5\u8a62\u7684\u60c5\u6cc1\u4e0b\uff0c\u5c0d\u6578\u64da\u9032\u884c\u5206\u7d44\u548c\u6392\u5e8f\u3002\u672c\u6587\u5c07\u63a2\u8a0e<code>OVER()<\/code>\u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5\u53ca\u5176\u5be6\u969b\u61c9\u7528\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afover%e5%87%bd%e6%95%b8%ef%bc%9f-mUScRKoewI\">\u4ec0\u9ebc\u662fOVER()\u51fd\u6578\uff1f<\/h2>\n<p><code>OVER()<\/code>\u51fd\u6578\u7528\u65bc\u5b9a\u7fa9\u7a97\u53e3\u7684\u7bc4\u570d\uff0c\u4e26\u4e14\u53ef\u4ee5\u8207\u805a\u5408\u51fd\u6578\uff08\u5982<code>SUM()<\/code>\u3001<code>AVG()<\/code>\u7b49\uff09\u7d50\u5408\u4f7f\u7528\u3002\u9019\u6a23\uff0c\u60a8\u53ef\u4ee5\u5728\u67e5\u8a62\u7d50\u679c\u4e2d\u7372\u5f97\u66f4\u9748\u6d3b\u7684\u6578\u64da\u5206\u6790\u3002<\/p>\n<h2 id=\"over%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-mUScRKoewI\">OVER()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<pre><code>\nSELECT column1, \n       aggregate_function(column2) OVER (PARTITION BY column3 ORDER BY column4) AS alias_name\nFROM table_name;\n<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>PARTITION BY<\/code>\u5b50\u53e5\u7528\u65bc\u5c07\u6578\u64da\u5206\u7d44\uff0c\u800c<code>ORDER BY<\/code>\u5b50\u53e5\u5247\u7528\u65bc\u5b9a\u7fa9\u6bcf\u500b\u5206\u7d44\u5167\u7684\u6392\u5e8f\u65b9\u5f0f\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%af%a6%e4%be%8b-mUScRKoewI\">\u4f7f\u7528\u5be6\u4f8b<\/h2>\n<h3 id=\"%e7%a4%ba%e4%be%8b1%ef%bc%9a%e8%a8%88%e7%ae%97%e6%af%8f%e5%80%8b%e9%83%a8%e9%96%80%e7%9a%84%e5%b9%b3%e5%9d%87%e8%96%aa%e8%b3%87-mUScRKoewI\">\u793a\u4f8b1\uff1a\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u5e73\u5747\u85aa\u8cc7<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>employees<\/code>\u7684\u8868\u683c\uff0c\u5305\u542b\u4ee5\u4e0b\u5b57\u6bb5\uff1a<code>employee_id<\/code>\u3001<code>department_id<\/code>\u548c<code>salary<\/code>\u3002\u6211\u5011\u5e0c\u671b\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u5e73\u5747\u85aa\u8cc7\u3002<\/p>\n<pre><code>\nSELECT employee_id, \n       department_id, \n       salary, \n       AVG(salary) OVER (PARTITION BY department_id) AS avg_salary\nFROM employees;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>AVG(salary)<\/code>\u51fd\u6578\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u5e73\u5747\u85aa\u8cc7\uff0c\u4e26\u5c07\u7d50\u679c\u986f\u793a\u5728<code>avg_salary<\/code>\u5217\u4e2d\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b2%ef%bc%9a%e8%a8%88%e7%ae%97%e7%b4%af%e7%a9%8d%e8%96%aa%e8%b3%87-mUScRKoewI\">\u793a\u4f8b2\uff1a\u8a08\u7b97\u7d2f\u7a4d\u85aa\u8cc7<\/h3>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u8a08\u7b97\u6bcf\u4f4d\u54e1\u5de5\u7684\u7d2f\u7a4d\u85aa\u8cc7\uff0c\u53ef\u4ee5\u4f7f\u7528<code>SUM()<\/code>\u51fd\u6578\u7d50\u5408<code>OVER()<\/code>\u51fd\u6578\u3002<\/p>\n<pre><code>\nSELECT employee_id, \n       salary, \n       SUM(salary) OVER (ORDER BY employee_id) AS cumulative_salary\nFROM employees;\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u6839\u64da<code>employee_id<\/code>\u7684\u9806\u5e8f\u8a08\u7b97\u6bcf\u4f4d\u54e1\u5de5\u7684\u7d2f\u7a4d\u85aa\u8cc7\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b3%ef%bc%9a%e4%bd%bf%e7%94%a8rows%e5%ad%90%e5%8f%a5%e9%99%90%e5%88%b6%e7%aa%97%e5%8f%a3%e7%af%84%e5%9c%8d-mUScRKoewI\">\u793a\u4f8b3\uff1a\u4f7f\u7528ROWS\u5b50\u53e5\u9650\u5236\u7a97\u53e3\u7bc4\u570d<\/h3>\n<p>\u6709\u6642\u5019\uff0c\u6211\u5011\u53ef\u80fd\u53ea\u60f3\u8a08\u7b97\u67d0\u500b\u7bc4\u570d\u5167\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u8a08\u7b97\u6bcf\u4f4d\u54e1\u5de5\u7684\u6700\u8fd1\u4e09\u500b\u6708\u7684\u85aa\u8cc7\u7e3d\u548c\u3002<\/p>\n<pre><code>\nSELECT employee_id, \n       salary, \n       SUM(salary) OVER (ORDER BY month ROWS BETWEEN 2 PRECEDING AND CURRENT ROW) AS last_three_months_salary\nFROM employee_salaries;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>ROWS BETWEEN 2 PRECEDING AND CURRENT ROW<\/code>\u6307\u5b9a\u4e86\u7a97\u53e3\u7684\u7bc4\u570d\uff0c\u50c5\u8a08\u7b97\u6700\u8fd1\u4e09\u500b\u6708\u7684\u85aa\u8cc7\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-mUScRKoewI\">\u7e3d\u7d50<\/h2>\n<p>Oracle\u7684<code>OVER()<\/code>\u51fd\u6578\u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u6578\u64da\u5206\u6790\u80fd\u529b\uff0c\u80fd\u5920\u5728\u67e5\u8a62\u4e2d\u9032\u884c\u8907\u96dc\u7684\u8a08\u7b97\u800c\u4e0d\u9700\u8981\u984d\u5916\u7684\u5b50\u67e5\u8a62\u3002\u901a\u904e\u4f7f\u7528<code>PARTITION BY<\/code>\u548c<code>ORDER BY<\/code>\u5b50\u53e5\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u5730\u5c0d\u6578\u64da\u9032\u884c\u5206\u7d44\u548c\u6392\u5e8f\uff0c\u5f9e\u800c\u7372\u5f97\u66f4\u6df1\u5165\u7684\u898b\u89e3\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u5206\u6790\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u9ad8\u6548\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle over()\u51fd\u6578\u7684\u4f7f\u7528\u5be6\u4f8b\uff0c\u4e86\u89e3\u5982\u4f55\u5728SQL\u67e5\u8a62\u4e2d\u9032\u884c\u7a97\u53e3\u51fd\u6578\u64cd\u4f5c\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u6548\u7387\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-93970","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/93970","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=93970"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/93970\/revisions"}],"predecessor-version":[{"id":93971,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/93970\/revisions\/93971"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=93970"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=93970"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=93970"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}