ประเทศใดบ้างที่มีภาษาอังกฤษหรือภาษาดัตช์เป็นภาษาราชการ
Which countries have either English or Dutch as an official language?
country = pd.DataFrame(columns=['Code']); countrylanguage = pd.DataFrame(columns=['CountryCode', 'Language', 'IsOfficial'])
country[country['Code'].isin(countrylanguage[(countrylanguage['Language'] == 'English') & (countrylanguage['IsOfficial'] == 'T')]['CountryCode']) | country['Code'].isin(countrylanguage[(countrylanguage['Language'] == 'Dutch') & (countrylanguage['IsOfficial'] == 'T')]['CountryCode'])]