Hi,
I would like to know if it is possible to set "complex" constraints on
databases such as:
A->B means that in table A, each record references a record of table B
(or NULL)
so we have:
A->B
C->B
D->C
D->A
constraint: for one record of D, D->A->B = D->C->B
Hope it is clear enough.
Erwan