text: with cte as (
  	select *, SysStartTime, SysEndTime, 'Base Table' SourceTable
  	from dbo.Product
  	where ProductID = 3
  
  	union
  
  	select *, 'History Table' SourceTable
  	from History.Product
  	where ProductID = 3
  )
  select * from cte
  order by sysendtime desc