lol

select Z.id_zamestnanca, Z.meno, Z.priezvisko from Zamestnanec as Z
join Faktúra as F on (Z.id_zamestnanca = F.id_zamestnanca)
group by Z.id_zamestnanca, Z.meno, Z.priezvisko
having COUNT(F.id_zamestnanca) > select COUNT(Za.id_zamestnanca) from Zamestnanec as Za
join Faktúra as Fa on (Za.id_zamestnanca = Fa.id_zamestnanca) where (Za.id_zamestnanca = 'JAP003')