Query Run
select rev_actor as actorid,year(rev_timestamp) as year,count(*) as... 3 years ago
select rev_actor,count(*) from revision where rev_timestamp like... 3 years ago
select min(user_editcount),avg(user_editcount),max(user_editcount) from user 3 years ago
select * from user where user_editcount =(select max(user_editcount) from user); 3 years ago