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select 
tags.tagname,
'younger' as age_cat,
sum(users.reputation) rep_tot, 
sum(posts.score) score_tot,
count(posts.owneruserid) users_tot
from users, posts, posttags, tags 
where
users.age is not null and users.age between 15 and 40
and users.reputation between 2 and 100000 
and year(posts.creationdate)=2012
and posts.owneruserid=users.id
and posts.id = posttags.postid
and posttags.tagid=tags.id
and tags.tagname 
in ('ruby','java','asp.net','linux','python','jquery','iphone','php','c#')
group by tags.tagname

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edited may 28 13

created may 28 13 pjmorris