[doc] improve tableoid description
Hi
Attached patch aims to improve the description of the tableoid system column [1]
by:
- mentioning it's useful for determining table names for partitioned tables as
well as for those in inheritance hierarchies
- mentioning the possibility of casting tableoid to regclass (which is simpler
than the currently suggested join on pg_class, which is only needed if
the schema name is absolutely required)
[1] https://www.postgresql.org/docs/current/ddl-system-columns.html
Regards
Ian Barwick
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