Database Reference
In-Depth Information
Example 2-7. Extensions installed on server
SELECT
name
,
default_version
,
installed_version
,
left
(
comment
,
30
)
As
comment
FROM
pg_available_extensions
WHERE
installed_version
IS
NOT
NULL
ORDER
BY
name
;
name | def | installed | com
---------------+-------+-----------+--------------------------------------------
btree_gist | 1.0 | 1.0 | support for indexing common datatypes in..
fuzzystrmatch | 1.0 | 1.0 | determine similarities and distance betw..
hstore | 1.2 | 1.2 | data type for storing sets of (key, valu..
plpgsql | 1.0 | 1.0 | PL/pgSQL procedural language..
plv8 | 1.3.0 | 1.3.0 | PL/JavaScript (v8) trusted procedural la..
postgis | 2.1.3 | 2.1.3 | PostGIS geometry, geography, and raster ..
www_fdw | 0.1.8 | 0.1.8 | WWW FDW - extension for handling differe..
To get more details about a particular extension already installed on your server, enter
the following command from psql:
\dx+ fuzzystrmatch
Alternatively, execute the following query:
SELECT
pg_catalog
.
pg_describe_object
(
d
.
classid
,
d
.
objid
,
0
)
AS
description
FROM
pg_catalog
.
pg_depend
AS
D
INNER
JOIN
pg_catalog
.
pg_extension
AS
E
ON
D
.
refobjid
=
E
.
oid
WHERE
D
.
refclassid
=
'pg_catalog.pg_extension'
::
pg_catalog
.
regclass
AND
deptype
=
'e'
AND
E
.
extname
=
'fuzzystrmatch'
;
This shows what's packaged in the extension:
description
----------------------------------------------------------------------------
function dmetaphone_alt(text)
function dmetaphone(text)
function difference(text,text)
function text_soundex(text)
function soundex(text)
function metaphone(text,integer)
function levenshtein_less_equal(text,text,integer,integer,integer,integer)
function levenshtein_less_equal(text,text,integer)
function levenshtein(text,text,integer,integer,integer)
function levenshtein(text,text)
Extensions can include database assets of all types: functions, tables, data types, casts,
languages, operators classes, etc., but functions usually constitute the bulk of the pay‐
load.
