Database: world_1
Question: How many countries speak both English and Dutch?
SQL: select count(*) from (select t1.name from country as t1 join countrylanguage as t2 on t1.code  =  t2.countrycode where t2.language  =  "english" intersect select t1.name from country as t1 join countrylanguage as t2 on t1.code  =  t2.countrycode where t2.language  =  "dutch")