Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
/*select count(distinct u.id) from users u left join posts p on u.id=p.owneruserid where (p.posttypeid<>1 or p.posttypeid is null) and (year(p.CreationDate)=2018 or p.CreationDate is null)*/ select count(distinct u.id) from users u left join posts p on u.id=p.owneruserid where p.posttypeid=1 and year(p.CreationDate)=2018