Database: world_1
Question: Which countries have either English or Dutch as an official language? For the official language value T is stand
SQL: select * from country as t1 join countrylanguage as t2 on t1.code  =  t2.countrycode where t2.language  =  "english" and isofficial  =  "t" union select * from country as t1 join countrylanguage as t2 on t1.code  =  t2.countrycode where t2.language  =  "dutch" and isofficial  =  "t"