stores optional descriptions (comments) for each database object.
Descriptions can be manipulated with the COMMENT command and viewed with
\d commands. Descriptions of many built-in
system objects are provided in the initial contents of
pg_shdescription, which performs a
similar function for descriptions involving objects that are
shared across a database cluster.
||any OID column||The OID of the object this description pertains to|
||The OID of the system catalog this object appears in|
||For a comment on a table column, this is the column
||Arbitrary text that serves as the description of this object|
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