Vazba
SQL vazba z tabulky PPFVAZ na tabulku PPF_HL
select *
from PPFVAZ ppfvaz
left outer join PPF_HL ppf_hl on ppf_hl.idpk = ppfvaz.idpk_oducto
select *
from PPFVAZ ppfvaz
left outer join PPF_HL ppf_hl on ppf_hl.idpk = ppfvaz.idpk_oducto