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 50-59. pg_available_extensions Columns
| Name | Type | Description | 
|---|---|---|
name |  name |  Extension name | 
default_version |  text |  Name of default version, or NULL if none is specified |  
installed_version |  text |  Currently installed version of the extension, or NULL if not installed |  
comment |  text |  Comment string from the extension's control file | 
The pg_available_extensions view is read only.
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