What is is the number of patients who are not using Procrastin-X?
select count ( * ) from patient where ssn not in ( select t1.patient from prescribes as t1 join medication as t2 on t1.medication = t2.code where t2.name = 'Procrastin-X' )
What are their names?
select name from patient where ssn not in ( select t1.patient from prescribes as t1 join medication as t2 on t1.medication = t2.code where t2.name = 'Procrastin-X' )
And what is their address?
select address from patient where ssn not in ( select t1.patient from prescribes as t1 join medication as t2 on t1.medication = t2.code where t2.name = 'Procrastin-X' )