What are the total number of students enrolled in 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'
total number of students enrolled in a specific course refers to COUNT(*); specific course ACCT-211 refers to crs_code = 'ACCT-211'; joining tables CLASS and enroll refers to JOIN on class_code;