52.65. pg\_available\_extensions

|52.65. `pg_available_extensions`|                   |                           |                  |                                                  |
|:------------------------------:|-------------------|---------------------------|------------------|--------------------------------------------------|
|  [Prev](views-overview.html)   |[Up](catalogs.html)|Chapter 52. System Catalogs|[Home](index.html)| [Next](view-pg-available-extension-versions.html)|

---

## 52.65. `pg_available_extensions`

[]()

 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.

---

|[Prev](views-overview.html)|[Up](catalogs.html)| [Next](view-pg-available-extension-versions.html)|
|:--------------------------|:-----------------:|-------------------------------------------------:|
|    52.64. System Views    |[Home](index.html) |     52.66. `pg_available_extension_versions`     |

 // \<![CDATA[ \<-- For SVG support if ('WebSocket' in window) { (function() { function refreshCSS() { var sheets = [].slice.call(document.getElementsByTagName("link")); var head = document.getElementsByTagName("head")[0]; for (var i = 0; i \< sheets.length; ++i) { var elem = sheets[i]; head.removeChild(elem); var rel = elem.rel; if (elem.href && typeof rel != "string" || rel.length == 0 || rel.toLowerCase() == "stylesheet") { var url = elem.href.replace(/(&|\\?)\_cacheOverride=\\d+/, ''); elem.href = url + (url.indexOf('?') \>= 0 ? '&' : '?') + '\_cacheOverride=' + (new Date().valueOf()); } head.appendChild(elem); } } var protocol = window.location.protocol === 'http:' ? 'ws://' : 'wss://'; var address = protocol + window.location.host + window.location.pathname + '/ws'; var socket = new WebSocket(address); socket.onmessage = function(msg) { if (msg.data == 'reload') window.location.reload(); else if (msg.data == 'refreshcss') refreshCSS(); }; console.log('Live reload enabled.'); })(); } // ]]\>