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 47-55. pg_available_extensions Columns
|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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