delete from MyTable t1
where user_id in (
select user_id
from MyTable t1
where exists (
select * from MyTable t2
where t1.user_id = t2.user_id
and t1.object_id <> t2.object_id
and t2.role = "ADMIN")
and role = "ORG_MANAGER"
and object_type = "type_b";
)