Vazba
SQL vazba z tabulky PCISIMP3U na tabulku PCISIMP2U
select *
from PCISIMP3U pcisimp3u
left outer join PCISIMP2U pcisimp2u on pcisimp2u.idpk = pcisimp3u.idpk_2u
select *
from PCISIMP3U pcisimp3u
left outer join PCISIMP2U pcisimp2u on pcisimp2u.idpk = pcisimp3u.idpk_2u