51.67. pg_available_extensions
 The pg_available_extensions view lists the extensions that are available for installation. See also the pg_extension catalog, which shows the extensions currently installed. 
Table 51.68. pg_available_extensions Columns
Column Type Description  | 
|---|
 Extension name  | 
  Name of default version, or   | 
  Currently installed version of the extension, or   | 
 Comment string from the extension's control file  | 
 The pg_available_extensions view is read-only.