Q&A for members of the workforce navigating the professional setting
select dateadd(week, datediff(week, 0, creationdate), 0), count(*) from users where creationdate >= '1/1/2011' group by dateadd(week, datediff(week, 0, creationdate), 0) order by dateadd(week, datediff(week, 0, creationdate), 0)