I try to detect the difference between 2 tables. The first table consists an NR1ID (autonumbering). The second table has an inner join to the first ( 1 at OO ) Now I'm truying to detect the rows in table 1 that have no links in table 2. I've tried with a select ..... where NRI1D<> with the linked row in table 2 but the results are bizar. Who can help me ?