How many institutions with over 50,000 students in 2011 had a percentage of oversea students of more than 10%?
institutions with over 50,000 students refers to num_students > 50000; in 2011 refers to year = 2011; percentage of oversea students of more than 10% refers to pct_international_students > 10;
SELECT COUNT(*) FROM university_year WHERE year = 2011 AND num_students > 50000 AND pct_international_students > 10