Q&A about the site for students, teachers, and linguists wanting to discuss the finer points of the Italian language
-- Number of unique users that have used a tag at least once -- Enter Query Description select top 100 t.TagName as [Tag], count(distinct u.Id) as [Users] from users u inner join posts p on u.Id = p.OwnerUserId inner join posttags pt on p.Id = pt.PostId inner join tags t on pt.TagId = t.Id where p.PostTypeId = 1 group by t.Id, t.TagName order by count(distinct u.Id) desc;