Database: college_1
Question: What is the name of the department that has the largest number of students enrolled?
SQL: select t4.dept_name from class as t1 join enroll as t2 on t1.class_code  =  t2.class_code join course as t3 on t1.crs_code  =  t3.crs_code join department as t4 on t3.dept_code  =  t4.dept_code group by t3.dept_code order by count(*) desc limit 1