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create table patient_record ( mrn_no varchar2(8), hcare varchar2(1) ); insert into patient_record (mrn_no, hcare) values ( '01111111', 'Y' ); insert into patient_record (mrn_no, hcare) values ( '00000000', null ); insert into patient_record (mrn_no, hcare) values ( '00222222', 'Y'); insert into patient_record (mrn_no, hcare) values ( '33333333', 'Y'); create table mrn_fasttrack ( mrn varchar2(8) ); insert into mrn_fasttrack (mrn) values ( '222222'); select mrn_no from patient_record where hcare = 'Y' except select LPAD( mrn, 8, '0') from mrn_fasttrack;

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