mysql每半小时平均值计算的sql语句
摘要：表结构：CREATETABLE`instance`(`id`int(11)unsignedNOTNULLAUTO_INCREMENT,`ti...
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;
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