Hello!  How many students are enrolled in the class with the course code of ACCT-211?
SELECT count ( * )  FROM CLASS AS T1 JOIN enroll AS T2 ON T1.class_code   =   T2.class_code WHERE T1.crs_code   =   'ACCT-211'
number of students enrolled in a class refers to COUNT(*); class with the course code of ACCT-211 refers to WHERE crs_code = 'ACCT-211';