2 つの行のデータを 1 つにマージする

SELECT ServerName, Country, contact = STUFF((SELECT '; ' 
    + ic.contact FROM dbo.Customer AS ic
  WHERE ic.ServerName = c.ServerName AND ic.Country = c.Country
  FOR XML PATH(''), TYPE).value('.','nvarchar(max)'), 1, 2, '')
FROM dbo.Customer AS c
GROUP BY ServerName, Country
ORDER BY ServerName;