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sql="select name,channelid from model_channel where channelid in (select rootchannel from model_content group by rootchannel order by sum(hits) desc) and rootchannel=81"



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select name,channelid 
from model_channel 
where channelid 
in (select rootchannel from model_content group by rootchannel)
-- order by sum(hits) desc) 
and rootchannel=81

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sql="select a.name,a.channelid 
from model_channel a, model_content b
where a.channelid =b.rootchannel and a.rootchannel=81"


select name,channelid 
from model_channel 
where channelid in 
(select rootchannel from model_content group by rootchannel order by sum(hits) desc) 
and rootchannel=81
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