Mysql
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DELETE consulta com WHERE EXISTS no MySQL

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";
)