mysql中使用sql找出每组当中最大的那条数据

统计每组中平均执行时间最长的URL的数据sql 写法一：url select A.url,A.count,A.sumtime,A.avgtime,A.addtime from baas_system_log A inner join (select addtime, max(avgtime) as avgtime from baas_system_log group by addtime) B

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