The pg_available_extension_versions view lists the specific extension versions that are available for installation. See also the pg_extension catalog, which shows the extensions currently installed.

Table 49-59. pg_available_extension_versions Columns

Name Type Description
name name Extension name
version text Version name
installed bool True if this version of this extension is currently installed
superuser bool True if only superusers are allowed to install this extension
relocatable bool True if extension can be relocated to another schema
schema name Name of the schema that the extension must be installed into, or NULL if partially or fully relocatable
requires name[] Names of prerequisite extensions, or NULL if none
comment text Comment string from the extension's control file

The pg_available_extension_versions view is read only.