SELECT df.Dropouts, df.Failures, df.Submits, df.Success, dv.Visits FROM
(SELECT [dbo].[Fact_FormStatisticsByContact].[FormId] AS FormId,
SUM([dbo].[Fact_FormStatisticsByContact].[Submits]) AS Submits, SUM([dbo].[Fact_FormStatisticsByContact].[Failures]) AS Failures,
SUM([dbo].[Fact_FormStatisticsByContact].[Dropouts]) AS Dropouts, SUM([dbo].[Fact_FormStatisticsByContact].[Success]) AS Success
FROM [dbo].[Fact_FormStatisticsByContact] WHERE [dbo].[Fact_FormStatisticsByContact].[FormId] = @FormId
group by [dbo].[Fact_FormStatisticsByContact].[FormId]) df INNER JOIN

(SELECT Count(distinct [dbo].[Fact_FormEvents].[InteractionId]) AS Visits,
[dbo].[Fact_FormEvents].[FormId] AS FormId
  FROM [dbo].[Fact_FormEvents]
  WHERE FormId = @FormId
  GROUP BY [dbo].[Fact_FormEvents].[FormId]  ) dv ON df.FormId = dv.FormId