{"id":160285,"date":"2024-11-03T21:49:19","date_gmt":"2024-11-03T13:49:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160285\/"},"modified":"2024-11-03T21:49:20","modified_gmt":"2024-11-03T13:49:20","slug":"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-variance","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160285\/","title":{"rendered":"OceanBase \u6559\u7a0b\uff1aOceanBase VARIANCE"},"content":{"rendered":"<h1 id=\"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-variance-lmzMxYMqNp\">OceanBase \u6559\u7a0b\uff1aOceanBase VARIANCE<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u5eab\u6280\u8853\u4e2d\uff0cOceanBase \u4f5c\u70ba\u4e00\u500b\u9ad8\u6027\u80fd\u7684\u5206\u4f48\u5f0f\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u8d8a\u4f86\u8d8a\u53d7\u5230\u958b\u767c\u8005\u548c\u4f01\u696d\u7684\u9752\u775e\u3002\u5b83\u4e0d\u50c5\u652f\u6301\u9ad8\u4e26\u767c\u7684\u4e8b\u52d9\u8655\u7406\uff0c\u9084\u5177\u5099\u826f\u597d\u7684\u64f4\u5c55\u6027\u548c\u5bb9\u932f\u80fd\u529b\u3002\u672c\u6587\u5c07\u91cd\u9ede\u4ecb\u7d39 OceanBase \u4e2d\u7684 VARIANCE \u51fd\u6578\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5176\u7528\u6cd5\u53ca\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-variance-%e5%87%bd%e6%95%b8%ef%bc%9f-lmzMxYMqNp\">\u4ec0\u9ebc\u662f VARIANCE \u51fd\u6578\uff1f<\/h2>\n<p>\u5728\u6578\u64da\u5206\u6790\u4e2d\uff0c\u65b9\u5dee\uff08Variance\uff09\u662f\u4e00\u500b\u91cd\u8981\u7684\u7d71\u8a08\u6307\u6a19\uff0c\u7528\u65bc\u8861\u91cf\u6578\u64da\u96c6\u7684\u96e2\u6563\u7a0b\u5ea6\u3002OceanBase \u63d0\u4f9b\u4e86 VARIANCE \u51fd\u6578\uff0c\u5141\u8a31\u7528\u6236\u8a08\u7b97\u4e00\u7d44\u6578\u503c\u7684\u65b9\u5dee\u3002\u9019\u5c0d\u65bc\u5206\u6790\u6578\u64da\u7684\u6ce2\u52d5\u6027\u548c\u7a69\u5b9a\u6027\u975e\u5e38\u6709\u5e6b\u52a9\u3002<\/p>\n<h2 id=\"variance-%e5%87%bd%e6%95%b8%e7%9a%84%e8%aa%9e%e6%b3%95-lmzMxYMqNp\">VARIANCE \u51fd\u6578\u7684\u8a9e\u6cd5<\/h2>\n<pre><code>VARIANCE(expression)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>expression<\/code> \u662f\u9700\u8981\u8a08\u7b97\u65b9\u5dee\u7684\u6578\u503c\u8868\u9054\u5f0f\u3002\u8a72\u51fd\u6578\u5c07\u8fd4\u56de\u4e00\u500b\u6d6e\u9ede\u6578\uff0c\u8868\u793a\u6240\u63d0\u4f9b\u6578\u64da\u96c6\u7684\u65b9\u5dee\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-variance-%e5%87%bd%e6%95%b8%e7%9a%84%e7%a4%ba%e4%be%8b-lmzMxYMqNp\">\u4f7f\u7528 VARIANCE \u51fd\u6578\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 VARIANCE \u51fd\u6578\u7684\u7c21\u55ae\u793a\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>sales<\/code> \u7684\u8868\uff0c\u8a72\u8868\u8a18\u9304\u4e86\u4e0d\u540c\u7522\u54c1\u7684\u92b7\u552e\u984d\uff1a<\/p>\n<pre><code>SELECT VARIANCE(sales_amount) AS sales_variance\nFROM sales;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8a08\u7b97 <code>sales_amount<\/code> \u5217\u7684\u65b9\u5dee\uff0c\u4e26\u5c07\u7d50\u679c\u547d\u540d\u70ba <code>sales_variance<\/code>\u3002<\/p>\n<h2 id=\"variance-%e5%87%bd%e6%95%b8%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-lmzMxYMqNp\">VARIANCE \u51fd\u6578\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<ul>\n<li><strong>\u98a8\u96aa\u8a55\u4f30\uff1a<\/strong>\u5728\u91d1\u878d\u9818\u57df\uff0c\u65b9\u5dee\u53ef\u4ee5\u7528\u4f86\u8a55\u4f30\u6295\u8cc7\u7d44\u5408\u7684\u98a8\u96aa\u3002\u8f03\u9ad8\u7684\u65b9\u5dee\u610f\u5473\u8457\u6295\u8cc7\u56de\u5831\u7684\u4e0d\u78ba\u5b9a\u6027\u8f03\u5927\u3002<\/li>\n<li><strong>\u8cea\u91cf\u63a7\u5236\uff1a<\/strong>\u5728\u88fd\u9020\u696d\u4e2d\uff0c\u65b9\u5dee\u53ef\u4ee5\u5e6b\u52a9\u4f01\u696d\u76e3\u63a7\u7522\u54c1\u7684\u4e00\u81f4\u6027\uff0c\u78ba\u4fdd\u7522\u54c1\u8cea\u91cf\u7b26\u5408\u6a19\u6e96\u3002<\/li>\n<li><strong>\u5e02\u5834\u5206\u6790\uff1a<\/strong>\u901a\u904e\u5206\u6790\u92b7\u552e\u6578\u64da\u7684\u65b9\u5dee\uff0c\u4f01\u696d\u53ef\u4ee5\u4e86\u89e3\u5e02\u5834\u9700\u6c42\u7684\u6ce2\u52d5\uff0c\u5f9e\u800c\u8abf\u6574\u71df\u92b7\u7b56\u7565\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-lmzMxYMqNp\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 VARIANCE \u51fd\u6578\u6642\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u6578\u64da\u96c6\u4e0d\u70ba\u7a7a\uff0c\u5426\u5247\u5c07\u8fd4\u56de NULL\u3002<\/li>\n<li>\u65b9\u5dee\u7684\u8a08\u7b97\u662f\u57fa\u65bc\u6a23\u672c\u7684\uff0c\u5c0d\u65bc\u6574\u500b\u6578\u64da\u96c6\u7684\u65b9\u5dee\u8a08\u7b97\uff0c\u61c9\u4f7f\u7528 <code>VARIANCE_POP<\/code> \u51fd\u6578\u3002<\/li>\n<li>\u5728\u8655\u7406\u5927\u6578\u64da\u96c6\u6642\uff0c\u8a08\u7b97\u65b9\u5dee\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u5fc5\u8981\u6642\u9032\u884c\u512a\u5316\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-lmzMxYMqNp\">\u7d50\u8ad6<\/h2>\n<p>OceanBase \u7684 VARIANCE \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u9032\u884c\u6578\u64da\u5206\u6790\u548c\u6c7a\u7b56\u652f\u6301\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528\u8a72\u51fd\u6578\uff0c\u4f01\u696d\u53ef\u4ee5\u66f4\u597d\u5730\u7406\u89e3\u5176\u6578\u64da\uff0c\u5f9e\u800c\u505a\u51fa\u66f4\u660e\u667a\u7684\u5546\u696d\u6c7a\u7b56\u3002\u5982\u679c\u60a8\u5c0d OceanBase \u6216\u5176\u4ed6\u6578\u64da\u5eab\u6280\u8853\u611f\u8208\u8da3\uff0c\u5efa\u8b70\u6df1\u5165\u5b78\u7fd2\u76f8\u95dc\u77e5\u8b58\uff0c\u4e26\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4ee5\u7372\u5f97\u66f4\u597d\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to use OceanBase VARIANCE in this comprehensive tutorial, enhancing your data analysis skills with practical examples and insights.<\/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-160285","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160285","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=160285"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160285\/revisions"}],"predecessor-version":[{"id":160286,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160285\/revisions\/160286"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160285"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160285"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160285"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}