Database: world_1
Question: What are the names of nations where both English and French are official languages?
SQL:
SELECT T1.Name FROM country AS T1 JOIN countrylanguage AS T2 ON T1.Code  =  T2.CountryCode WHERE T2.Language  =  "English" AND T2.IsOfficial  =  "T" INTERSECT SELECT T1.Name FROM country AS T1 JOIN countrylanguage AS T2 ON T1.Code  =  T2.CountryCode WHERE T2.Language  =  "French" AND T2.IsOfficial  =  "T"