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Q&A for serious players and enthusiasts of chess

select count(*) from users u where u.id not in (select p.owneruserid from posts p
where year(p.creationdate)=2018 and p.posttypeid=1 and p.owneruserid is not null) 
and year(u.creationdate)<2019

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edited nov 16 19

created nov 16 19 anonymous