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The fundamental notion in Postgres is that of a class,
which is a named collection of object instances. Each
instance has the same collection of named attributes,
and each attribute is of a specific type. Furthermore,
each instance has a permanent object identifier
(OID)
that is unique throughout the installation. Because
SQL syntax refers to tables, we will use the terms
table and class interchangeably.
Likewise, an SQLrow is an
instance and SQLcolumns
are attributes.
As previously discussed, classes are grouped into
databases, and a collection of databases managed by a
single postmaster process constitutes an installation
or site.
