mysql每半小时平均值计算的sql语句
编程学习 2021-07-05 15:28www.dzhlxh.cn编程入门
有时候我们需要计算每半小时的平均值，那么就需要参考狼蚁网站SEO优化的sql语句了
表结构：
CREATE TABLE `instance` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `timestamp` int(10) unsigned DEFAULT NULL, `cpu` decimal(8,3) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB;
统计每半小时平均值，实现可以如下：
select `timestamp`-`timestamp`% (5*60) , avg(cup) from `instance` group by `timestamp`-`timestamp`% (5*60)
另外还有：
SELECT queueName, HOUR(dt) AS h, FLOOR(MINUTE(dt) / 30) AS v , avg(memoryUsed), sum(memoryUsed), count(memoryUsed) from queue_resource where dt>='2014-04-14 00:00:00' GROUP BY h, v, queueName;