{"id":217814,"date":"2023-12-23T00:42:26","date_gmt":"2023-12-22T16:42:26","guid":{"rendered":"https:\/\/www.idc.net\/help\/217814\/"},"modified":"2023-12-23T00:42:26","modified_gmt":"2023-12-22T16:42:26","slug":"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8avg%e5%87%bd%e6%95%b0%e8%bf%94%e5%9b%9e%e6%95%b0%e5%80%bc%e5%88%97%e7%9a%84%e5%b9%b3%e5%9d%87%e5%80%bc","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/217814\/","title":{"rendered":"MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528AVG()\u51fd\u6570\u8fd4\u56de\u6570\u503c\u5217\u7684\u5e73\u5747\u503c"},"content":{"rendered":"<p><title id=\"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8avg%e5%87%bd%e6%95%b0%e8%bf%94%e5%9b%9e%e6%95%b0%e5%80%bc%e5%88%97%e7%9a%84%e5%b9%b3%e5%9d%87%e5%80%bc-mTDNRoBxwI\">MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528AVG()\u51fd\u6570\u8fd4\u56de\u6570\u503c\u5217\u7684\u5e73\u5747\u503c<\/title><\/p>\n<h1 id=\"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8avg%e5%87%bd%e6%95%b0%e8%bf%94%e5%9b%9e%e6%95%b0%e5%80%bc%e5%88%97%e7%9a%84%e5%b9%b3%e5%9d%87%e5%80%bc-mTDNRoBxwI\">MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528AVG()\u51fd\u6570\u8fd4\u56de\u6570\u503c\u5217\u7684\u5e73\u5747\u503c<\/h1>\n<p>\u5728MySQL\u4e2d\uff0cAVG()\u51fd\u6570\u7528\u4e8e\u8ba1\u7b97\u6570\u503c\u5217\u7684\u5e73\u5747\u503c\u3002\u5b83\u662f\u4e00\u79cd\u805a\u5408\u51fd\u6570\uff0c\u53ef\u4ee5\u7528\u4e8e\u7edf\u8ba1\u6570\u636e\u7684\u5e73\u5747\u503c\u3002<\/p>\n<h2 id=\"%e8%af%ad%e6%b3%95-mTDNRoBxwI\">\u8bed\u6cd5<\/h2>\n<p>AVG()\u51fd\u6570\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT AVG(column_name) FROM table_name;<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>column_name<\/code>\u662f\u8981\u8ba1\u7b97\u5e73\u5747\u503c\u7684\u6570\u503c\u5217\u7684\u540d\u79f0\uff0c<code>table_name<\/code>\u662f\u5305\u542b\u8be5\u5217\u7684\u8868\u7684\u540d\u79f0\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b-mTDNRoBxwI\">\u793a\u4f8b<\/h2>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3a<code>students<\/code>\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u5b66\u751f\u7684\u6210\u7ee9\u4fe1\u606f\u3002\u8be5\u8868\u7684\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<pre><code>+----+-------+\n| id | score |\n+----+-------+\n|  1 |    80 |\n|  2 |    90 |\n|  3 |    85 |\n|  4 |    95 |\n|  5 |    75 |\n+----+-------+\n<\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528AVG()\u51fd\u6570\u8ba1\u7b97\u5b66\u751f\u7684\u5e73\u5747\u6210\u7ee9\uff1a<\/p>\n<pre><code>SELECT AVG(score) FROM students;<\/code><\/pre>\n<p>\u6267\u884c\u4ee5\u4e0a\u67e5\u8be2\u8bed\u53e5\u540e\uff0c\u5c06\u8fd4\u56de\u5b66\u751f\u7684\u5e73\u5747\u6210\u7ee9\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a1%b9-mTDNRoBxwI\">\u6ce8\u610f\u4e8b\u9879<\/h2>\n<p>\u5728\u4f7f\u7528AVG()\u51fd\u6570\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<ul>\n<li>AVG()\u51fd\u6570\u53ea\u80fd\u7528\u4e8e\u6570\u503c\u5217\uff0c\u4e0d\u80fd\u7528\u4e8e\u6587\u672c\u5217\u6216\u65e5\u671f\u5217\u3002<\/li>\n<li>\u5982\u679c\u6570\u503c\u5217\u4e2d\u5305\u542bNULL\u503c\uff0cAVG()\u51fd\u6570\u4f1a\u5ffd\u7565\u8fd9\u4e9bNULL\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%80%bb%e7%bb%93-mTDNRoBxwI\">\u603b\u7ed3<\/h2>\n<p>\u901a\u8fc7\u4f7f\u7528AVG()\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u8ba1\u7b97\u6570\u503c\u5217\u7684\u5e73\u5747\u503c\u3002\u5728MySQL\u4e2d\uff0cAVG()\u51fd\u6570\u662f\u975e\u5e38\u6709\u7528\u7684\u805a\u5408\u51fd\u6570\u4e4b\u4e00\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5bfb\u627e\u53ef\u9760\u7684\u4e91\u8ba1\u7b97\u670d\u52a1\u63d0\u4f9b\u5546\uff0c\u540e\u6d6a\u4e91\u662f\u60a8\u7684\u9996\u9009\u3002\u6211\u4eec\u63d0\u4f9b\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u548c\u4e91\u670d\u52a1\u5668\u7b49\u591a\u79cd\u4ea7\u54c1\uff0c\u4ee5\u6ee1\u8db3\u4e0d\u540c\u7528\u6237\u7684\u9700\u6c42\u3002\u60a8\u53ef\u4ee5\u8bbf\u95ee\u6211\u4eec\u7684\u5b98\u7f51\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff1a<a href=\"https:\/\/idc.net\">https:\/\/idc.net<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528AVG()\u51fd\u6570\u8fd4\u56de\u6570\u503c\u5217\u7684\u5e73\u5747\u503c MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528AVG()\u51fd\u6570\u8fd4\u56de\u6570\u503c\u5217\u7684\u5e73 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[197851],"tags":[],"class_list":["post-217814","post","type-post","status-publish","format-standard","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217814","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=217814"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217814\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=217814"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=217814"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=217814"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}