Q&A for Ubuntu users and developers
declare @tagName varchar(25) = ##TagName:string## SELECT SingleTagQs.Id AS [Post Link] FROM ( ( SELECT Posts.Id , COUNT( PostTags.TagId ) AS TagCount FROM Posts JOIN PostTags ON Posts.Id = PostTags.PostId GROUP BY Posts.Id HAVING COUNT( PostTags.TagId ) = 1 ) AS SingleTagQs JOIN PostTags ON SingleTagQs.Id = PostTags.PostId ) JOIN Tags ON PostTags.TagId = Tags.Id WHERE Tags.TagName = @tagName -- and Posts.ClosedDate is null