我有一个基本的 group by/avg 语句：
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;
我现在想要做的是删除 ping 值高于平均 500 的任何结果。我该怎么做...？
只需添加一个having clause:
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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