{"id":186390,"date":"2024-11-11T05:31:28","date_gmt":"2024-11-10T21:31:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186390\/"},"modified":"2024-11-11T05:31:29","modified_gmt":"2024-11-10T21:31:29","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84over%e5%87%bd%e6%95%b8%e7%b0%a1%e4%bb%8b%e5%8f%8a%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%abover%e5%87%bd%e6%95%b8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186390\/","title":{"rendered":"\u6578\u64da\u5eab\u7684over\u51fd\u6578\u7c21\u4ecb\u53ca\u61c9\u7528\u5834\u666f\uff08\u6578\u64da\u5eabover\u51fd\u6578\uff09"},"content":{"rendered":"

\u6578\u64da\u5eab\u7684OVER\u51fd\u6578\u7c21\u4ecb\u53ca\u61c9\u7528\u5834\u666f<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cOVER\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728\u67e5\u8a62\u4e2d\u9032\u884c\u66f4\u8907\u96dc\u7684\u8a08\u7b97\u548c\u5206\u6790\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u4ecb\u7d39OVER\u51fd\u6578\u7684\u57fa\u672c\u6982\u5ff5\u3001\u8a9e\u6cd5\u4ee5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u5834\u666f\u3002<\/p>\n

OVER\u51fd\u6578\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

OVER\u51fd\u6578\u4e3b\u8981\u7528\u65bc\u7a97\u53e3\u51fd\u6578\uff08Window Functions\uff09\uff0c\u5b83\u5141\u8a31\u7528\u6236\u5728\u67e5\u8a62\u7d50\u679c\u4e2d\u9032\u884c\u805a\u5408\u8a08\u7b97\uff0c\u800c\u4e0d\u9700\u8981\u5c07\u6578\u64da\u5206\u7d44\u3002\u9019\u610f\u5473\u8457\u7528\u6236\u53ef\u4ee5\u5728\u4e0d\u6539\u8b8a\u67e5\u8a62\u7d50\u679c\u7684\u60c5\u6cc1\u4e0b\uff0c\u5c0d\u6bcf\u4e00\u884c\u6578\u64da\u9032\u884c\u8a08\u7b97\u3002\u9019\u5728\u9700\u8981\u9032\u884c\u6392\u540d\u3001\u7d2f\u8a08\u548c\u79fb\u52d5\u5e73\u5747\u7b49\u64cd\u4f5c\u6642\u7279\u5225\u6709\u7528\u3002<\/p>\n

OVER\u51fd\u6578\u7684\u8a9e\u6cd5<\/h2>\n

OVER\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

\u51fd\u6578\u540d() OVER (PARTITION BY \u5217\u540d ORDER BY \u5217\u540d)<\/code><\/pre>\n
\u5176\u4e2d\uff0c\u51fd\u6578\u540d<\/code>\u53ef\u4ee5\u662f\u5404\u7a2e\u805a\u5408\u51fd\u6578\uff0c\u5982SUM\u3001AVG\u3001ROW_NUMBER\u7b49\u3002PARTITION BY<\/code>\u5b50\u53e5\u7528\u65bc\u5c07\u6578\u64da\u5206\u7d44\uff0c\u800cORDER BY<\/code>\u5b50\u53e5\u5247\u7528\u65bc\u6307\u5b9a\u6392\u5e8f\u65b9\u5f0f\u3002<\/p>\n
\u793a\u4f8b<\/h3>\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528OVER\u51fd\u6578\u7684\u793a\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70basales<\/code>\u7684\u8868\uff0c\u5305\u542b\u4ee5\u4e0b\u5b57\u6bb5\uff1aid<\/code>\u3001salesperson<\/code>\u548camount<\/code>\u3002<\/p>\n
SELECT \n    salesperson, \n    amount, \n    SUM(amount) OVER (PARTITION BY salesperson ORDER BY id) AS cumulative_sales\nFROM \n    sales;<\/code><\/pre>\n
\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u8a08\u7b97\u4e86\u6bcf\u4f4d\u92b7\u552e\u4eba\u54e1\u7684\u7d2f\u8a08\u92b7\u552e\u984d\u3002PARTITION BY<\/code>\u5b50\u53e5\u5c07\u6578\u64da\u6309\u92b7\u552e\u4eba\u54e1\u5206\u7d44\uff0c\u800cORDER BY<\/code>\u5b50\u53e5\u5247\u78ba\u4fdd\u7d2f\u8a08\u662f\u6309\u7167id<\/code>\u7684\u9806\u5e8f\u9032\u884c\u7684\u3002<\/p>\n
OVER\u51fd\u6578\u7684\u61c9\u7528\u5834\u666f<\/h2>\n
1. \u6392\u540d<\/h3>\n
\u4f7f\u7528ROW_NUMBER()<\/code>\u51fd\u6578\u53ef\u4ee5\u70ba\u67e5\u8a62\u7d50\u679c\u4e2d\u7684\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u6392\u540d\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u6839\u64da\u92b7\u552e\u984d\u5c0d\u92b7\u552e\u4eba\u54e1\u9032\u884c\u6392\u540d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
SELECT \n    salesperson, \n    amount, \n    ROW_NUMBER() OVER (ORDER BY amount DESC) AS rank\nFROM \n    sales;<\/code><\/pre>\n
2. \u79fb\u52d5\u5e73\u5747<\/h3>\n
\u79fb\u52d5\u5e73\u5747\u662f\u4e00\u7a2e\u5e38\u898b\u7684\u6578\u64da\u5206\u6790\u6280\u8853\uff0c\u53ef\u4ee5\u5e73\u6ed1\u6578\u64da\u6ce2\u52d5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u8a08\u7b97\u79fb\u52d5\u5e73\u5747\u7684\u793a\u4f8b\uff1a<\/p>\n
SELECT \n    id, \n    amount, \n    AVG(amount) OVER (ORDER BY id ROWS BETWEEN 2 PRECEDING AND CURRENT ROW) AS moving_avg\nFROM \n    sales;<\/code><\/pre>\n
\u9019\u500b\u67e5\u8a62\u8a08\u7b97\u4e86\u6bcf\u4e00\u884c\u7684\u6700\u8fd1\u4e09\u500b\u6578\u64da\u9ede\u7684\u5e73\u5747\u503c\u3002<\/p>\n
3. \u7d2f\u8a08\u548c\u767e\u5206\u6bd4\u8a08\u7b97<\/h3>\n
OVER\u51fd\u6578\u9084\u53ef\u4ee5\u7528\u65bc\u8a08\u7b97\u7d2f\u8a08\u548c\u767e\u5206\u6bd4\u3002\u4f8b\u5982\uff0c\u8a08\u7b97\u6bcf\u4f4d\u92b7\u552e\u4eba\u54e1\u7684\u92b7\u552e\u984d\u5360\u7e3d\u92b7\u552e\u984d\u7684\u767e\u5206\u6bd4\uff1a<\/p>\n
SELECT \n    salesperson, \n    amount, \n    amount * 100.0 \/ SUM(amount) OVER () AS percentage_of_total\nFROM \n    sales;<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
OVER\u51fd\u6578\u5728\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u63d0\u4f9b\u4e86\u9748\u6d3b\u6027\u548c\u5f37\u5927\u7684\u8a08\u7b97\u80fd\u529b\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u9032\u884c\u6392\u540d\u3001\u79fb\u52d5\u5e73\u5747\u548c\u7d2f\u8a08\u8a08\u7b97\u7684\u5834\u666f\u4e2d\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528OVER\u51fd\u6578\uff0c\u6578\u64da\u5206\u6790\u5e2b\u548c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u8655\u7406\u548c\u5206\u6790\u6578\u64da\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u548c\u6578\u64da\u5eab\u9700\u6c42\u3002\u7121\u8ad6\u662f\u9700\u8981\u7a69\u5b9a\u7684\u6027\u80fd\u9084\u662f\u9748\u6d3b\u7684\u64f4\u5c55\u6027\uff0c\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7406\u60f3\u7684\u9078\u64c7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u6578\u64da\u5eab\u7684OVER\u51fd\u6578\u53ca\u5176\u61c9\u7528\u5834\u666f\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u6548\u7387\uff0c\u5be6\u73fe\u66f4\u9748\u6d3b\u7684\u67e5\u8a62\u548c\u8a08\u7b97\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-186390","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186390","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=186390"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186390\/revisions"}],"predecessor-version":[{"id":186391,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186390\/revisions\/186391"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=186390"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=186390"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=186390"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}