## 52.66. `pg_available_extension_versions`

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

**Table 52.67. `pg_available_extension_versions` Columns**

|                                                 Column Type<br/><br/> Description                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------|
|                                              `name` `name`<br/><br/> Extension name                                               |
|                                              `version` `text`<br/><br/> Version name                                              |
|                    `installed` `bool`<br/><br/> True if this version of this extension is currently installed                     |
|          `superuser` `bool`<br/><br/> True if only superusers are allowed to install this extension (but see `trusted`)           |
|          `trusted` `bool`<br/><br/> True if the extension can be installed by non-superusers with appropriate privileges          |
|                        `relocatable` `bool`<br/><br/> True if extension can be relocated to another schema                        |
|`schema` `name`<br/><br/> Name of the schema that the extension must be installed into, or `NULL` if partially or fully relocatable|
|                         `requires` `name[]`<br/><br/> Names of prerequisite extensions, or `NULL` if none                         |
|                            `comment` `text`<br/><br/> Comment string from the extension's control file                            |

 The `pg_available_extension_versions` view is read-only.

