55.20. `pg_description`
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## 55.20. `pg_description` #

The catalog `pg_description` stores optional descriptions (comments) for each database object. Descriptions can be manipulated with the `COMMENT` command and viewed with psql's `\d` 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 database cluster.

Table 55.20. `pg_description` Columns

Column Type Description
`objoid` `oid` (references any OID column) The OID of the object this description pertains to
`classoid` `oid` (references `pg_class`.`oid`) The OID of the system catalog this object appears in
`objsubid` `int4` For a comment on a table column, this is the column number (the `objoid` and `classoid` refer to the table itself). For all other object types, this column is zero.
`description` `text` Arbitrary text that serves as the description of this object

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