select *
from Zamestnanci
where ID_Zamestnance not in (Select ID_Zamestnance from sluzebni_cesty) and
ID_Zamestnance not in (Select ID_Zamestnance from faktury)
select *
from Zamestnanci
where ID_Zamestnance not in (Select ID_Zamestnance from sluzebni_cesty) and
ID_Zamestnance not in (Select ID_Zamestnance from faktury)