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📄 ABORT.7(2.17 KB)
📄 ALTER_AGGREGATE.7(4.97 KB)
📄 ALTER_COLLATION.7(2.8 KB)
📄 ALTER_CONVERSION.7(2.89 KB)
📄 ALTER_DATABASE.7(5.71 KB)
📄 ALTER_DEFAULT_PRIVILEGES.7(6.34 KB)
📄 ALTER_DOMAIN.7(6.96 KB)
📄 ALTER_EVENT_TRIGGER.7(2.42 KB)
📄 ALTER_EXTENSION.7(6.89 KB)
📄 ALTER_FOREIGN_DATA_WRAPPER.7(4.56 KB)
📄 ALTER_FOREIGN_TABLE.7(12.8 KB)
📄 ALTER_FUNCTION.7(8.26 KB)
📄 ALTER_GROUP.7(3.08 KB)
📄 ALTER_INDEX.7(5.59 KB)
📄 ALTER_LANGUAGE.7(2.1 KB)
📄 ALTER_LARGE_OBJECT.7(1.97 KB)
📄 ALTER_MATERIALIZED_VIEW.7(4.66 KB)
📄 ALTER_OPERATOR.7(3.67 KB)
📄 ALTER_OPERATOR_CLASS.7(2.86 KB)
📄 ALTER_OPERATOR_FAMILY.7(9.12 KB)
📄 ALTER_POLICY.7(2.88 KB)
📄 ALTER_ROLE.7(9.04 KB)
📄 ALTER_RULE.7(2.21 KB)
📄 ALTER_SCHEMA.7(2.31 KB)
📄 ALTER_SEQUENCE.7(7.53 KB)
📄 ALTER_SERVER.7(3.41 KB)
📄 ALTER_SYSTEM.7(3.8 KB)
📄 ALTER_TABLE.7(35.2 KB)
📄 ALTER_TABLESPACE.7(3.35 KB)
📄 ALTER_TEXT_SEARCH_CONFIGURATION.7(4.79 KB)
📄 ALTER_TEXT_SEARCH_DICTIONARY.7(4.02 KB)
📄 ALTER_TEXT_SEARCH_PARSER.7(2.23 KB)
📄 ALTER_TEXT_SEARCH_TEMPLATE.7(2.26 KB)
📄 ALTER_TRIGGER.7(2.98 KB)
📄 ALTER_TYPE.7(7.15 KB)
📄 ALTER_USER.7(2.66 KB)
📄 ALTER_USER_MAPPING.7(3.26 KB)
📄 ALTER_VIEW.7(4.67 KB)
📄 ANALYZE.7(7.67 KB)
📄 BEGIN.7(4.06 KB)
📄 CHECKPOINT.7(2.29 KB)
📄 CLOSE.7(2.72 KB)
📄 CLUSTER.7(6.23 KB)
📄 COMMENT.7(10.2 KB)
📄 COMMIT.7(2.1 KB)
📄 COMMIT_PREPARED.7(2.58 KB)
📄 COPY.7(29.88 KB)
📄 CREATE_ACCESS_METHOD.7(2.9 KB)
📄 CREATE_AGGREGATE.7(23.35 KB)
📄 CREATE_CAST.7(13.55 KB)
📄 CREATE_COLLATION.7(3.97 KB)
📄 CREATE_CONVERSION.7(3.78 KB)
📄 CREATE_DATABASE.7(8.48 KB)
📄 CREATE_DOMAIN.7(6.52 KB)
📄 CREATE_EVENT_TRIGGER.7(3.74 KB)
📄 CREATE_EXTENSION.7(6.57 KB)
📄 CREATE_FOREIGN_DATA_WRAPPER.7(4.96 KB)
📄 CREATE_FOREIGN_TABLE.7(9 KB)
📄 CREATE_FUNCTION.7(24.73 KB)
📄 CREATE_GROUP.7(2.11 KB)
📄 CREATE_INDEX.7(19.56 KB)
📄 CREATE_LANGUAGE.7(9.83 KB)
📄 CREATE_MATERIALIZED_VIEW.7(4.21 KB)
📄 CREATE_OPERATOR.7(6.88 KB)
📄 CREATE_OPERATOR_CLASS.7(8.52 KB)
📄 CREATE_OPERATOR_FAMILY.7(3.6 KB)
📄 CREATE_POLICY.7(15.92 KB)
📄 CREATE_ROLE.7(12.69 KB)
📄 CREATE_RULE.7(8.63 KB)
📄 CREATE_SCHEMA.7(6.15 KB)
📄 CREATE_SEQUENCE.7(9.79 KB)
📄 CREATE_SERVER.7(3.63 KB)
📄 CREATE_TABLE.7(42.1 KB)
📄 CREATE_TABLESPACE.7(4.47 KB)
📄 CREATE_TABLE_AS.7(7.8 KB)
📄 CREATE_TEXT_SEARCH_CONFIGURATION.7(3.19 KB)
📄 CREATE_TEXT_SEARCH_DICTIONARY.7(3.34 KB)
📄 CREATE_TEXT_SEARCH_PARSER.7(3.56 KB)
📄 CREATE_TEXT_SEARCH_TEMPLATE.7(3.38 KB)
📄 CREATE_TRANSFORM.7(5.79 KB)
📄 CREATE_TRIGGER.7(16.3 KB)
📄 CREATE_TYPE.7(28.96 KB)
📄 CREATE_USER.7(2.45 KB)
📄 CREATE_USER_MAPPING.7(3.27 KB)
📄 CREATE_VIEW.7(14.63 KB)
📄 DEALLOCATE.7(1.98 KB)
📄 DECLARE.7(10.22 KB)
📄 DELETE.7(7.36 KB)
📄 DISCARD.7(2.81 KB)
📄 DO.7(3.08 KB)
📄 DROP_ACCESS_METHOD.7(2.35 KB)
📄 DROP_AGGREGATE.7(3.8 KB)
📄 DROP_CAST.7(2.26 KB)
📄 DROP_COLLATION.7(2.42 KB)
📄 DROP_CONVERSION.7(2.36 KB)
📄 DROP_DATABASE.7(2.38 KB)
📄 DROP_DOMAIN.7(2.34 KB)
📄 DROP_EVENT_TRIGGER.7(2.38 KB)
📄 DROP_EXTENSION.7(2.73 KB)
📄 DROP_FOREIGN_DATA_WRAPPER.7(2.61 KB)
📄 DROP_FOREIGN_TABLE.7(2.59 KB)
📄 DROP_FUNCTION.7(3.35 KB)
📄 DROP_GROUP.7(1.57 KB)
📄 DROP_INDEX.7(3.08 KB)
📄 DROP_LANGUAGE.7(2.86 KB)
📄 DROP_MATERIALIZED_VIEW.7(2.64 KB)
📄 DROP_OPERATOR.7(3.01 KB)
📄 DROP_OPERATOR_CLASS.7(3.48 KB)
📄 DROP_OPERATOR_FAMILY.7(3.24 KB)
📄 DROP_OWNED.7(3.14 KB)
📄 DROP_POLICY.7(2.53 KB)
📄 DROP_ROLE.7(3.05 KB)
📄 DROP_RULE.7(2.35 KB)
📄 DROP_SCHEMA.7(2.76 KB)
📄 DROP_SEQUENCE.7(2.46 KB)
📄 DROP_SERVER.7(2.39 KB)
📄 DROP_TABLE.7(2.97 KB)
📄 DROP_TABLESPACE.7(2.48 KB)
📄 DROP_TEXT_SEARCH_CONFIGURATION.7(2.83 KB)
📄 DROP_TEXT_SEARCH_DICTIONARY.7(2.75 KB)
📄 DROP_TEXT_SEARCH_PARSER.7(2.66 KB)
📄 DROP_TEXT_SEARCH_TEMPLATE.7(2.69 KB)
📄 DROP_TRANSFORM.7(2.59 KB)
📄 DROP_TRIGGER.7(2.6 KB)
📄 DROP_TYPE.7(2.53 KB)
📄 DROP_USER.7(1.65 KB)
📄 DROP_USER_MAPPING.7(2.56 KB)
📄 DROP_VIEW.7(2.43 KB)
📄 END.7(2.19 KB)
📄 EXECUTE.7(2.9 KB)
📄 EXPLAIN.7(13.03 KB)
📄 FETCH.7(8.48 KB)
📄 GRANT.7(21.29 KB)
📄 IMPORT_FOREIGN_SCHEMA.7(3.98 KB)
📄 INSERT.7(19.61 KB)
📄 LISTEN.7(3.51 KB)
📄 LOAD.7(2.54 KB)
📄 LOCK.7(8.01 KB)
📄 MOVE.7(2.92 KB)
📄 NOTIFY.7(8.21 KB)
📄 PREPARE.7(8.2 KB)
📄 PREPARE_TRANSACTION.7(5.74 KB)
📄 REASSIGN_OWNED.7(3.01 KB)
📄 REFRESH_MATERIALIZED_VIEW.7(3.92 KB)
📄 REINDEX.7(7.69 KB)
📄 RELEASE_SAVEPOINT.7(3 KB)
📄 RESET.7(2.93 KB)
📄 REVOKE.7(10.44 KB)
📄 ROLLBACK.7(2.09 KB)
📄 ROLLBACK_PREPARED.7(2.6 KB)
📄 ROLLBACK_TO_SAVEPOINT.7(3.94 KB)
📄 SAVEPOINT.7(3.5 KB)
📄 SECURITY_LABEL.7(5.39 KB)
📄 SELECT.7(63.33 KB)
📄 SELECT_INTO.7(4.37 KB)
📄 SET.7(7.57 KB)
📄 SET_CONSTRAINTS.7(4.48 KB)
📄 SET_ROLE.7(4.36 KB)
📄 SET_SESSION_AUTHORIZATION.7(3.88 KB)
📄 SET_TRANSACTION.7(8.27 KB)
📄 SHOW.7(4.22 KB)
📄 START_TRANSACTION.7(2.9 KB)
📄 TABLE.7(18 B)
📄 TRUNCATE.7(6.39 KB)
📄 UNLISTEN.7(2.75 KB)
📄 UPDATE.7(12.26 KB)
📄 VACUUM.7(7.92 KB)
📄 VALUES.7(6.94 KB)
📄 WITH.7(18 B)

Editing: CREATE_EXTENSION.7

'\" t
.\"     Title: CREATE EXTENSION
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 2018
.\"    Manual: PostgreSQL 9.6.9 Documentation
.\"    Source: PostgreSQL 9.6.9
.\"  Language: English
.\"
.TH "CREATE EXTENSION" "7" "2018" "PostgreSQL 9.6.9" "PostgreSQL 9.6.9 Documentation"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
CREATE_EXTENSION \- install an extension
.SH "SYNOPSIS"
.sp
.nf
CREATE EXTENSION [ IF NOT EXISTS ] \fIextension_name\fR
    [ WITH ] [ SCHEMA \fIschema_name\fR ]
             [ VERSION \fIversion\fR ]
             [ FROM \fIold_version\fR ]
             [ CASCADE ]
.fi
.SH "DESCRIPTION"
.PP
\fBCREATE EXTENSION\fR
loads a new extension into the current database\&. There must not be an extension of the same name already loaded\&.
.PP
Loading an extension essentially amounts to running the extension\*(Aqs script file\&. The script will typically create new
SQL
objects such as functions, data types, operators and index support methods\&.
\fBCREATE EXTENSION\fR
additionally records the identities of all the created objects, so that they can be dropped again if
\fBDROP EXTENSION\fR
is issued\&.
.PP
Loading an extension requires the same privileges that would be required to create its component objects\&. For most extensions this means superuser or database owner privileges are needed\&. The user who runs
\fBCREATE EXTENSION\fR
becomes the owner of the extension for purposes of later privilege checks, as well as the owner of any objects created by the extension\*(Aqs script\&.
.SH "PARAMETERS"
.PP
IF NOT EXISTS
.RS 4
Do not throw an error if an extension with the same name already exists\&. A notice is issued in this case\&. Note that there is no guarantee that the existing extension is anything like the one that would have been created from the currently\-available script file\&.
.RE
.PP
\fIextension_name\fR
.RS 4
The name of the extension to be installed\&.
PostgreSQL
will create the extension using details from the file
SHAREDIR/extension/\fIextension_name\fR\&.control\&.
.RE
.PP
\fIschema_name\fR
.RS 4
The name of the schema in which to install the extension\*(Aqs objects, given that the extension allows its contents to be relocated\&. The named schema must already exist\&. If not specified, and the extension\*(Aqs control file does not specify a schema either, the current default object creation schema is used\&.
.sp
If the extension specifies a
schema
parameter in its control file, then that schema cannot be overridden with a
SCHEMA
clause\&. Normally, an error will be raised if a
SCHEMA
clause is given and it conflicts with the extension\*(Aqs
schema
parameter\&. However, if the
CASCADE
clause is also given, then
\fIschema_name\fR
is ignored when it conflicts\&. The given
\fIschema_name\fR
will be used for installation of any needed extensions that do not specify
schema
in their control files\&.
.sp
Remember that the extension itself is not considered to be within any schema: extensions have unqualified names that must be unique database\-wide\&. But objects belonging to the extension can be within schemas\&.
.RE
.PP
\fIversion\fR
.RS 4
The version of the extension to install\&. This can be written as either an identifier or a string literal\&. The default version is whatever is specified in the extension\*(Aqs control file\&.
.RE
.PP
\fIold_version\fR
.RS 4
FROM
\fIold_version\fR
must be specified when, and only when, you are attempting to install an extension that replaces an
\(lqold style\(rq
module that is just a collection of objects not packaged into an extension\&. This option causes
\fBCREATE EXTENSION\fR
to run an alternative installation script that absorbs the existing objects into the extension, instead of creating new objects\&. Be careful that
SCHEMA
specifies the schema containing these pre\-existing objects\&.
.sp
The value to use for
\fIold_version\fR
is determined by the extension\*(Aqs author, and might vary if there is more than one version of the old\-style module that can be upgraded into an extension\&. For the standard additional modules supplied with pre\-9\&.1
PostgreSQL, use
unpackaged
for
\fIold_version\fR
when updating a module to extension style\&.
.RE
.PP
CASCADE
.RS 4
Automatically install any extensions that this extension depends on that are not already installed\&. Their dependencies are likewise automatically installed, recursively\&. The
SCHEMA
clause, if given, applies to all extensions that get installed this way\&. Other options of the statement are not applied to automatically\-installed extensions; in particular, their default versions are always selected\&.
.RE
.SH "NOTES"
.PP
Before you can use
\fBCREATE EXTENSION\fR
to load an extension into a database, the extension\*(Aqs supporting files must be installed\&. Information about installing the extensions supplied with
PostgreSQL
can be found in
Additional Supplied Modules\&.
.PP
The extensions currently available for loading can be identified from the
pg_available_extensions
or
pg_available_extension_versions
system views\&.
.PP
For information about writing new extensions, see
Section 36.15, \(lqPackaging Related Objects into an Extension\(rq, in the documentation\&.
.SH "EXAMPLES"
.PP
Install the
hstore
extension into the current database:
.sp
.if n \{\
.RS 4
.\}
.nf
CREATE EXTENSION hstore;
.fi
.if n \{\
.RE
.\}
.PP
Update a pre\-9\&.1 installation of
hstore
into extension style:
.sp
.if n \{\
.RS 4
.\}
.nf
CREATE EXTENSION hstore SCHEMA public FROM unpackaged;
.fi
.if n \{\
.RE
.\}
.sp
Be careful to specify the schema in which you installed the existing
hstore
objects\&.
.SH "COMPATIBILITY"
.PP
\fBCREATE EXTENSION\fR
is a
PostgreSQL
extension\&.
.SH "SEE ALSO"
ALTER EXTENSION (\fBALTER_EXTENSION\fR(7)), DROP EXTENSION (\fBDROP_EXTENSION\fR(7))

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