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select distinct owneruserid from posts p join users u on p.owneruserid=u.id
where lower(location) like '%russia%'
group by owneruserid
having count(case when tags like '%sql%' 
and year(p.creationdate)<2015 
and month(p.creationdate)<10 then 1 end)=0 and 
count(case when tags like '%sql%' 
and year(p.creationdate)=2015 
and month(p.creationdate)=10 then 1 end)>0

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edited nov 17 19

created nov 17 19 anonymous