select FORMAT(s.requestStartTimeStamp, 'dd.MM.yyyy HH:mm') as 'Time stamp', u.nachname as 'Name', u.vorname as 'Vorname', u.descUserCn as 'Kennung', s.requestedURL as URL from tblStatsPageViews s join tableUsers u on s.user_id = u.intUserCn where u.mandator_id = @current_mandator_id and (@dateRange_start is null or s.requestStartTimeStamp >= @dateRange_start) and (@dateRange_end is null or s.requestStartTimeStamp < @dateRange_end) and (@string is null or @string = '' or s.requestedURL like '%' + @string + '%') order by [Name] asc, [Vorname] asc, [Kennung] asc