I am working on an application system refinement. There is a user profile table in the
current system. After the refinement, there are new separated roles, A and B, of the
users. The role A only has a few valid fields of the original profile table while the
role B still has the whole profile table. In regarding of the DB scheme design, that
should be an ideal case of using inheritance. I can have something like
table PROFILE_A (
ID int – PK,
...
):
table PROFILE_B {
...
inherits (A)
);
However, there is a problem. There are some multi-valued field tables, such as
languages the person can speak, associated with the profile table referred by ID in
the profile table. These tables are still needed for the A and B. But, the ID is not
accessible from the PROFILE_B.
What is the best solution for this DB scheme problem?
p.s. I can't use array data type for the multi-valued fields since they need to be
workable with a selection statement, nor xml or comma separated format for
maintainablity concern.
Thanks,
v.
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