How would I go about this question without the use of COUNT(*), I was able to reach the solution easily using it but I'm struggling with doing it without the use of COUNT(*)

Given the following relational database schema:

Student = (SSN, Name, Major)

Course = ( CourseNumber , CourseTitle, NumberOfUnits, RoomNumber, DayTime), where DayTime is of the form MW 1:0-2:00.

Enrollment = (SSN , CourseNumber, Grade)

Express the following queries using SQL statements with minimum number of tables and operations.

1. List the name of every student who enrolled in at least two courses.