## 52.65. `pg_available_extensions`

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 The `pg_available_extensions` view lists the extensions that are available for installation. See also the [`pg_extension`](catalog-pg-extension.html) catalog, which shows the extensions currently installed.

**Table 52.66. `pg_available_extensions` Columns**

|                                      Column Type<br/><br/> Description                                      |
|-------------------------------------------------------------------------------------------------------------|
|                                   `name` `name`<br/><br/> Extension name                                    |
|         `default_version` `text`<br/><br/> Name of default version, or `NULL` if none is specified          |
|`installed_version` `text`<br/><br/> Currently installed version of the extension, or `NULL` if not installed|
|                 `comment` `text`<br/><br/> Comment string from the extension's control file                 |

 The `pg_available_extensions` view is read-only.

