{"id":160069,"date":"2024-11-03T20:01:19","date_gmt":"2024-11-03T12:01:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160069\/"},"modified":"2024-11-03T20:01:21","modified_gmt":"2024-11-03T12:01:21","slug":"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-avg","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160069\/","title":{"rendered":"OceanBase \u6559\u7a0b\uff1aOceanBase AVG"},"content":{"rendered":"<h1 id=\"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-avg-DfetwCqAyr\">OceanBase \u6559\u7a0b\uff1aOceanBase AVG<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002OceanBase \u4f5c\u70ba\u4e00\u6b3e\u9ad8\u6027\u80fd\u7684\u5206\u4f48\u5f0f\u6578\u64da\u5eab\uff0c\u5df2\u7d93\u5728\u591a\u500b\u884c\u696d\u4e2d\u5f97\u5230\u4e86\u5ee3\u6cdb\u61c9\u7528\u3002\u672c\u6587\u5c07\u91cd\u9ede\u4ecb\u7d39 OceanBase \u4e2d\u7684 AVG \u51fd\u6578\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728 OceanBase \u4e2d\u9032\u884c\u6578\u64da\u5206\u6790\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-oceanbase%ef%bc%9f-DfetwCqAyr\">\u4ec0\u9ebc\u662f OceanBase\uff1f<\/h2>\n<p>OceanBase \u662f\u963f\u91cc\u5df4\u5df4\u96c6\u5718\u958b\u767c\u7684\u4e00\u6b3e\u5206\u4f48\u5f0f\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff0c\u65e8\u5728\u652f\u6301\u9ad8\u53ef\u7528\u6027\u548c\u9ad8\u64f4\u5c55\u6027\u7684\u9700\u6c42\u3002\u5b83\u7684\u8a2d\u8a08\u7406\u5ff5\u662f\u70ba\u4e86\u61c9\u5c0d\u5927\u898f\u6a21\u7684\u6578\u64da\u8655\u7406\u9700\u6c42\uff0c\u4e26\u4e14\u80fd\u5920\u5728\u591a\u7a2e\u74b0\u5883\u4e2d\u904b\u884c\uff0c\u5305\u62ec\u96f2\u7aef\u548c\u672c\u5730\u90e8\u7f72\u3002OceanBase \u652f\u6301 SQL \u8a9e\u8a00\uff0c\u4e26\u4e14\u517c\u5bb9 MySQL \u548c Oracle \u7684\u8a9e\u6cd5\uff0c\u9019\u4f7f\u5f97\u5b83\u5728\u9077\u79fb\u548c\u4f7f\u7528\u4e0a\u66f4\u52a0\u9748\u6d3b\u3002<\/p>\n<h2 id=\"avg-%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-DfetwCqAyr\">AVG \u51fd\u6578\u6982\u8ff0<\/h2>\n<p>\u5728 SQL \u4e2d\uff0cAVG \u51fd\u6578\u7528\u65bc\u8a08\u7b97\u4e00\u7d44\u6578\u503c\u7684\u5e73\u5747\u503c\u3002\u5728 OceanBase \u4e2d\uff0cAVG \u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\u8207\u5176\u4ed6 SQL \u6578\u64da\u5eab\u76f8\u4f3c\u3002\u5b83\u901a\u5e38\u7528\u65bc\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u4e2d\uff0c\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u7372\u53d6\u6578\u64da\u7684\u6574\u9ad4\u8da8\u52e2\u3002<\/p>\n<h3 id=\"avg-%e5%87%bd%e6%95%b8%e7%9a%84%e8%aa%9e%e6%b3%95-DfetwCqAyr\">AVG \u51fd\u6578\u7684\u8a9e\u6cd5<\/h3>\n<pre><code>SELECT AVG(column_name) FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>column_name<\/code> \u662f\u9700\u8981\u8a08\u7b97\u5e73\u5747\u503c\u7684\u5217\u540d\uff0c<code>table_name<\/code> \u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c<code>condition<\/code> \u662f\u53ef\u9078\u7684\u904e\u6ffe\u689d\u4ef6\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-avg-%e5%87%bd%e6%95%b8%e7%9a%84%e5%af%a6%e4%be%8b-DfetwCqAyr\">\u4f7f\u7528 AVG \u51fd\u6578\u7684\u5be6\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 AVG \u51fd\u6578\u7684\u5be6\u969b\u793a\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>sales<\/code> \u7684\u8868\uff0c\u8a72\u8868\u5305\u542b\u92b7\u552e\u6578\u64da\uff0c\u5305\u62ec <code>amount<\/code> \u5217\uff0c\u8a18\u9304\u6bcf\u7b46\u4ea4\u6613\u7684\u91d1\u984d\u3002<\/p>\n<pre><code>SELECT AVG(amount) AS average_sales FROM sales;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>sales<\/code> \u8868\u4e2d\u6240\u6709\u4ea4\u6613\u91d1\u984d\u7684\u5e73\u5747\u503c\uff0c\u4e26\u5c07\u7d50\u679c\u547d\u540d\u70ba <code>average_sales<\/code>\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e6%a2%9d%e4%bb%b6%e8%a8%88%e7%ae%97%e5%b9%b3%e5%9d%87%e5%80%bc-DfetwCqAyr\">\u4f7f\u7528\u689d\u4ef6\u8a08\u7b97\u5e73\u5747\u503c<\/h3>\n<p>\u6709\u6642\u5019\uff0c\u6211\u5011\u53ef\u80fd\u53ea\u60f3\u8a08\u7b97\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\u7684\u5e73\u5747\u503c\u3002\u4f8b\u5982\uff0c\u6211\u5011\u53ef\u4ee5\u8a08\u7b97\u67d0\u500b\u7279\u5b9a\u6708\u4efd\u7684\u5e73\u5747\u92b7\u552e\u984d\uff1a<\/p>\n<pre><code>SELECT AVG(amount) AS average_sales_january FROM sales WHERE MONTH(sale_date) = 1;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>sales<\/code> \u8868\u4e2d\u6240\u6709\u5728\u4e00\u6708\u4efd\u7684\u4ea4\u6613\u91d1\u984d\u7684\u5e73\u5747\u503c\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-DfetwCqAyr\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>AVG \u51fd\u6578\u53ea\u8a08\u7b97\u975e NULL \u503c\uff0c\u56e0\u6b64\u5728\u8a08\u7b97\u6642\u9700\u8981\u6ce8\u610f\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002<\/li>\n<li>\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u4f7f\u7528 AVG \u51fd\u6578\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u5fc5\u8981\u6642\u4f7f\u7528\u7d22\u5f15\u4f86\u512a\u5316\u67e5\u8a62\u3002<\/li>\n<li>\u5728\u5206\u4f48\u5f0f\u74b0\u5883\u4e2d\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u805a\u5408\u8a08\u7b97\u6642\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-DfetwCqAyr\">\u7e3d\u7d50<\/h2>\n<p>OceanBase \u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u5176\u4e2d AVG \u51fd\u6578\u662f\u9032\u884c\u6578\u64da\u5206\u6790\u7684\u91cd\u8981\u5de5\u5177\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528 AVG \u51fd\u6578\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u7372\u53d6\u6578\u64da\u7684\u5e73\u5747\u503c\uff0c\u5f9e\u800c\u5e6b\u52a9\u60a8\u505a\u51fa\u66f4\u660e\u667a\u7684\u5546\u696d\u6c7a\u7b56\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f\u5176\u4ed6\u96f2\u670d\u52d9\uff0c\u60a8\u90fd\u53ef\u4ee5\u5728\u6211\u5011\u7684\u7db2\u7ad9\u4e0a\u627e\u5230\u5408\u9069\u7684\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1OceanBase\u6570\u636e\u5e93\u7684\u4f7f\u7528\u6280\u5de7\u4e0e\u6700\u4f73\u5b9e\u8df5\uff0c\u63d0\u5347\u6570\u636e\u7ba1\u7406\u6548\u7387\uff0c\u8f7b\u677e\u5e94\u5bf9\u5927\u89c4\u6a21\u6570\u636e\u5904\u7406\u6311\u6218\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-160069","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160069","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=160069"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160069\/revisions"}],"predecessor-version":[{"id":160070,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160069\/revisions\/160070"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160069"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160069"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160069"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}