List out student names that enrolled in two schools and two organizations?
enrolled in two schools refers to COUNT(school) = 2; two organizations refers to COUNT(organ) = 2;
SELECT T.name FROM ( SELECT T1.name, COUNT(T1.organ) AS num FROM enlist AS T1 INNER JOIN enrolled AS T2 ON T1.name = T2.name GROUP BY T1.name ) T WHERE T.num = 2