Hallo, dein JOINe dein Resultset von
select MACADDR, count(MACADDR) As Anzahl
from networks
group by MACADDR
having count(MACADDR) > 1;
wieder mit der Tabelle 'networks' anhand der MACADDR, quasi ungefähr so
select n1.*
from networks n1
INNER JOIN (select MACADDRfrom networks
group by MACADDR
having count(MACADDR) > 1) n2
ON n1.MACADDR = n2.MACADDR
Das sollte dir _alle_ Doubletten mit Id aus networks geben
Gruss, FFR