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
profiletable while the role B still has the whole profile table. In regarding of the DB scheme design, that should be
anideal 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,
associatedwith 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,
norxml or comma separated format for maintainablity concern.
Thanks,
v.
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