#Credenciado (Found 1)
mmp10=> select count(*) from mmp_pre_dossie as d left join res_partner as p on d.credenciado_id=p.id where p.name='';
 count
-------
     1
(1 registro)

#Autor (Found 4)
mmp10=> select count(*) from mmp_pre_dossie as d left join res_partner as p on d.autor_id=p.id where p.name='';
 count
-------
     4
(1 registro)

#Contato (Found 153)
mmp10=> select count(*) from mmp_pre_dossie as d left join res_partner as p on d.contato_id=p.id where p.name='';
 count
-------
   153
(1 registro)