Common problem with inheritance is that references work ONLY with top table
and are not propagated to children.
Is it possible to write triggers (like utils/adt/ri_triggers.c) which will
act on INSERT/UPDATE/DELETE and check/cascade/restrict properly ?
pg_attribute, pg_inherits inherits can be used along with an additional
(non-system) table to store foreign keys.
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
