« Reactie #1 Gepost op: 05 februari 2003, 14:34:12 »
select count(telefoon), telefoon
from tabel
group by telefoon
having count(telefoon) > 1
Gelogd
Systeem1: AMD Athlon XP 1800+, 512 MB DDR, MSI K7T266Pro2-RU , 2xWD 80GB Raid0, Geforce 4 Ti4200, SB Live, Realtek 10/100 Ethernet, Windows XP
Systeem2: Pentium III 500MHz, 384MB, Maxtor 40GB, Maxtor 30 GB, IBM 20 GB, Realtek 10/100 Ethernet, Realtek 10 Ethernet, Red Hat Linux 7.1