## 51.66. `pg_available_extension_versions`

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 51.67. `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.