This is a novice question from a newbie regarding mapping ERD generalization hierarchies (GH) schema using table
inheritancein Postgresql.
There are cases where the specialization tables in a generalization hierarchy allow overlapping to occur. To
illustratethis point with an example, a GH for employee could have a generalized table employee and overlapping
specializedtables Manager and Programmer. An employee that was both a manager and a programmer would have a record
insertedinto each specialized table.
My question is, will the generalized table have duplicate records for this employee or will uniqueness be maintained?
Orare rules and triggers required to maintain normalization of the generalized table.
Regards,
Richard B.
