Question: List out the country code and country name of the rich countries using Euro as their currency unit
SQL: SELECT DISTINCT T1.CountryCode, T2.CountryName FROM Country AS T1 INNER JOIN Indicators AS T2 ON T1.CountryCode = T2.CountryCode WHERE T1.CurrencyUnit = 'Euro' AND (T1.IncomeGroup = 'High income: OECD' OR T1.IncomeGroup = 'High income: nonOECD')