{"id":173535,"date":"2024-11-07T18:50:22","date_gmt":"2024-11-07T10:50:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/173535\/"},"modified":"2024-11-07T18:50:23","modified_gmt":"2024-11-07T10:50:23","slug":"%e5%a6%82%e4%bd%95%e8%a8%88%e7%ae%97%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%9f%90%e4%b8%80%e5%88%97%e7%9a%84%e7%b8%bd%e5%92%8c%e6%88%96%e5%b9%b3%e5%9d%87%e5%80%bc-%e8%a8%88%e7%ae%97%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/173535\/","title":{"rendered":"\u5982\u4f55\u8a08\u7b97\u6578\u64da\u5eab\u4e2d\u67d0\u4e00\u5217\u7684\u7e3d\u548c\u6216\u5e73\u5747\u503c (\u8a08\u7b97\u6578\u64da\u5eab\u4e2d\u67d0\u4e00\u5217)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e8%a8%88%e7%ae%97%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%9f%90%e4%b8%80%e5%88%97%e7%9a%84%e7%b8%bd%e5%92%8c%e6%88%96%e5%b9%b3%e5%9d%87%e5%80%bc-GXAHzULGMG\">\u5982\u4f55\u8a08\u7b97\u6578\u64da\u5eab\u4e2d\u67d0\u4e00\u5217\u7684\u7e3d\u548c\u6216\u5e73\u5747\u503c<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u8a08\u7b97\u67d0\u4e00\u5217\u7684\u7e3d\u548c\u6216\u5e73\u5747\u503c\u662f\u975e\u5e38\u5e38\u898b\u7684\u9700\u6c42\u3002\u9019\u4e0d\u50c5\u80fd\u5e6b\u52a9\u6211\u5011\u5206\u6790\u6578\u64da\uff0c\u9084\u80fd\u63d0\u4f9b\u6709\u50f9\u503c\u7684\u898b\u89e3\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u8a08\u7b97\u67d0\u4e00\u5217\u7684\u7e3d\u548c\u548c\u5e73\u5747\u503c\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u7bc4\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8sql%e8%a8%88%e7%ae%97%e7%b8%bd%e5%92%8c%e5%92%8c%e5%b9%b3%e5%9d%87%e5%80%bc-GXAHzULGMG\">\u4f7f\u7528SQL\u8a08\u7b97\u7e3d\u548c\u548c\u5e73\u5747\u503c<\/h2>\n<p>SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u8a08\u7b97\u67d0\u4e00\u5217\u7684\u7e3d\u548c\u548c\u5e73\u5747\u503c\u901a\u5e38\u4f7f\u7528\u805a\u5408\u51fd\u6578\uff0c\u5982 <code>SUM()<\/code> \u548c <code>AVG()<\/code>\u3002<\/p>\n<h3 id=\"%e8%a8%88%e7%ae%97%e7%b8%bd%e5%92%8c-GXAHzULGMG\">\u8a08\u7b97\u7e3d\u548c<\/h3>\n<p>\u8981\u8a08\u7b97\u67d0\u4e00\u5217\u7684\u7e3d\u548c\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>SUM()<\/code> \u51fd\u6578\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>sales<\/code> \u7684\u8868\u683c\uff0c\u5176\u4e2d\u5305\u542b <code>amount<\/code> \u5217\uff0c\u8a18\u9304\u6bcf\u7b46\u92b7\u552e\u7684\u91d1\u984d\uff1a<\/p>\n<pre><code>SELECT SUM(amount) AS total_sales FROM sales;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>amount<\/code> \u5217\u7684\u7e3d\u548c\uff0c\u4e26\u5c07\u7d50\u679c\u547d\u540d\u70ba <code>total_sales<\/code>\u3002<\/p>\n<h3 id=\"%e8%a8%88%e7%ae%97%e5%b9%b3%e5%9d%87%e5%80%bc-GXAHzULGMG\">\u8a08\u7b97\u5e73\u5747\u503c<\/h3>\n<p>\u8981\u8a08\u7b97\u67d0\u4e00\u5217\u7684\u5e73\u5747\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>AVG()<\/code> \u51fd\u6578\u3002\u4ee5\u4e0b\u662f\u8a08\u7b97 <code>amount<\/code> \u5217\u5e73\u5747\u503c\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT AVG(amount) AS average_sales FROM sales;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>amount<\/code> \u5217\u7684\u5e73\u5747\u503c\uff0c\u4e26\u5c07\u7d50\u679c\u547d\u540d\u70ba <code>average_sales<\/code>\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e4%b8%8d%e5%90%8c%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b3%bb%e7%b5%b1-GXAHzULGMG\">\u4f7f\u7528\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71<\/h2>\n<p>\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u53ef\u80fd\u6703\u6709\u4e9b\u8a31\u5dee\u7570\uff0c\u4f46\u5927\u591a\u6578\u90fd\u652f\u6301 SQL \u8a9e\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u53ca\u5176\u8a08\u7b97\u7e3d\u548c\u548c\u5e73\u5747\u503c\u7684\u65b9\u5f0f\uff1a<\/p>\n<ul>\n<li><strong>MySQL\uff1a<\/strong> MySQL \u4f7f\u7528\u6a19\u6e96\u7684 SQL \u8a9e\u6cd5\uff0c\u652f\u6301 <code>SUM()<\/code> \u548c <code>AVG()<\/code> \u51fd\u6578\u3002<\/li>\n<li><strong>PostgreSQL\uff1a<\/strong> PostgreSQL \u4e5f\u652f\u6301\u9019\u4e9b\u805a\u5408\u51fd\u6578\uff0c\u4e26\u4e14\u5728\u8655\u7406\u5927\u6578\u64da\u96c6\u6642\u8868\u73fe\u826f\u597d\u3002<\/li>\n<li><strong>SQL Server\uff1a<\/strong> \u5728 SQL Server \u4e2d\uff0c\u540c\u6a23\u53ef\u4ee5\u4f7f\u7528 <code>SUM()<\/code> \u548c <code>AVG()<\/code> \u4f86\u8a08\u7b97\u7e3d\u548c\u548c\u5e73\u5747\u503c\u3002<\/li>\n<li><strong>SQLite\uff1a<\/strong> SQLite \u4e5f\u652f\u6301\u9019\u4e9b\u805a\u5408\u51fd\u6578\uff0c\u4e26\u4e14\u975e\u5e38\u8f15\u91cf\u7d1a\uff0c\u9069\u5408\u5c0f\u578b\u61c9\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%80%b2%e9%9a%8e%e7%94%a8%e6%b3%95-GXAHzULGMG\">\u9032\u968e\u7528\u6cd5<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u7e3d\u548c\u548c\u5e73\u5747\u503c\u8a08\u7b97\u5916\uff0c\u9084\u53ef\u4ee5\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u9032\u884c\u8a08\u7b97\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u53ea\u60f3\u8a08\u7b97\u67d0\u4e00\u985e\u5225\u7684\u92b7\u552e\u7e3d\u548c\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\uff1a<\/p>\n<pre><code>SELECT SUM(amount) AS total_sales FROM sales WHERE category = 'Electronics';<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u50c5\u8a08\u7b97\u985e\u5225\u70ba &#8216;Electronics&#8217; \u7684\u92b7\u552e\u7e3d\u548c\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-GXAHzULGMG\">\u7d50\u8ad6<\/h2>\n<p>\u8a08\u7b97\u6578\u64da\u5eab\u4e2d\u67d0\u4e00\u5217\u7684\u7e3d\u548c\u6216\u5e73\u5747\u503c\u662f\u6578\u64da\u5206\u6790\u4e2d\u7684\u57fa\u672c\u64cd\u4f5c\u3002\u901a\u904e\u4f7f\u7528 SQL \u7684\u805a\u5408\u51fd\u6578\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u5730\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u7121\u8ad6\u662f MySQL\u3001PostgreSQL \u9084\u662f\u5176\u4ed6\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u9019\u4e9b\u57fa\u672c\u7684 SQL \u67e5\u8a62\u90fd\u80fd\u5e6b\u52a9\u6211\u5011\u5feb\u901f\u7372\u5f97\u6709\u50f9\u503c\u7684\u898b\u89e3\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u548c\u5206\u6790\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\u66f4\u5feb\u7684\u6578\u64da\u5b58\u53d6\u901f\u5ea6\u548c\u66f4\u7a69\u5b9a\u7684\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u8a08\u7b97\u6578\u64da\u5eab\u4e2d\u7279\u5b9a\u5217\u7684\u7e3d\u548c\u6216\u5e73\u5747\u503c\uff0c\u638c\u63e1SQL\u67e5\u8a62\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u80fd\u529b\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-173535","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173535","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=173535"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173535\/revisions"}],"predecessor-version":[{"id":173536,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173535\/revisions\/173536"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=173535"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=173535"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=173535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}