create table xyz (a integer, b varchar(5));
insert into xyz values (1, 'te');
insert into xyz values (1, 'we');
insert into xyz values (1, 're');
insert into xyz values (2, 'te');
insert into xyz values (2, 're');
insert into xyz values (3, 'ge');
insert into xyz values (4, 're');
select a from xyz where a not in (select a from xyz where b='te');
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