Database: student_transcripts_tracking
Question: What is the program id and the summary of the degree that has the most students enrolled?
SQL: select t1.degree_program_id ,  t1.degree_summary_name from degree_programs as t1 join student_enrolment as t2 on t1.degree_program_id  =  t2.degree_program_id group by t1.degree_program_id order by count(*) desc limit 1