Refresh Your Java - Before Java Interview
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Every table (or even view) should have some unique
key. The mathematical definition of
a relation is a set
of tuples. (Sets do not permit duplicate elements.)
Furthermore,
truly identical rows can not possibly have
any meaningful semantics from the user's
perspective.
In some cases it may be sensible to go
as far as mapping all columns of a view as a
<composite-id/>, but there is almost always some
smaller business key. (Note that Hibernate
does not
require that this unique key be enforced by the database schema,
of course.)
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