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The pg_description table can store an optional description or
comment for each database object. Descriptions can be manipulated
with the COMMENT command. Client
applications can view the descriptions by joining with this
table. Many builtin system objects have comments associated with
them that are shown by psql's
Table 3-7. pg_description Columns
||any oid attribute
||The oid of the object this
description pertains to
||Arbitrary text that serves
as the description of this object.