pg_description
The pg_description system catalog table stores optional descriptions (comments) for each database object. Descriptions can be manipulated with the COMMENT command and viewed with psql’s \d meta-commands. Descriptions of many built-in system objects are provided in the initial contents of pg_description. See also pg_shdescription, which performs a similar function for descriptions involving objects that are shared across a HAWQ system.
Table 1. pg_catalog.pg_description
| column | type | references | description |
|---|---|---|---|
objoid |
oid | any OID column | The OID of the object this description pertains to. |
classoid |
oid | pg_class.oid | The OID of the system catalog this object appears in |
objsubid |
integer | For a comment on a table column, this is the column number. For all other object types, this column is zero. | |
description |
text | Arbitrary text that serves as the description of this object. |