SELECT title AS Titel, firstname + ' ' + lastname AS [Name], company AS [Firma], department AS [Abteilung], phone AS [Telefon], email AS [E-Mail], '- Ohne -' AS [Branche], 'ja' AS [DSGVO], Convert(varchar,registrationDate,126) AS [DSGVO Zeitstempel], zipcode AS [Postleitzahl] FROM tblSelfRegisteredUsers WHERE status = 2 AND mandator_id = @current_mandator_id AND (@dateRange_start IS NULL OR registrationDate > @dateRange_start) AND (@dateRange_end IS NULL OR registrationDate < @dateRange_end) ORDER BY registrationDate