SQL分组依据:使用where子句逻辑基于聚合函数过滤结果 [英] SQL group by: using where-clause logic to filter results based on aggregate functions

问题描述

我有一个基本的group by/avg语句:

I have a basic group by/avg statement:

select url, avg(contentping+tcpping), count(*) from websites ws, ping pi 
where ws.idwebsite = pi.idwebsite and errortype is null
group by url order by avg(contentping+tcpping) asc;

我现在想做的是丢弃任何比ping平均值高500的结果.我该怎么做...?

What I want to do now is to drop any results which have a higher than average ping of 500. How can I do this...?

推荐答案

只需添加having子句:

select url, avg(contentping+tcpping), count(*) from websites ws, ping pi 
where ws.idwebsite = pi.idwebsite and errortype is null
group by url 
having avg(contenetping+tcpping) < 500
order by avg(contentping+tcpping) asc;

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