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+'\" t
+.\"     Title: ALTER USER MAPPING
+.\"    Author: The PostgreSQL Global Development Group
+.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
+.\"      Date: 2021
+.\"    Manual: PostgreSQL 13.4 Documentation
+.\"    Source: PostgreSQL 13.4
+.\"  Language: English
+.\"
+.TH "ALTER USER MAPPING" "7" "2021" "PostgreSQL 13.4" "PostgreSQL 13.4 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"
+ALTER_USER_MAPPING \- change the definition of a user mapping
+.SH "SYNOPSIS"
+.sp
+.nf
+ALTER USER MAPPING FOR { \fIuser_name\fR | USER | CURRENT_USER | SESSION_USER | PUBLIC }
+    SERVER \fIserver_name\fR
+    OPTIONS ( [ ADD | SET | DROP ] \fIoption\fR [\*(Aq\fIvalue\fR\*(Aq] [, \&.\&.\&. ] )
+.fi
+.SH "DESCRIPTION"
+.PP
+\fBALTER USER MAPPING\fR
+changes the definition of a user mapping\&.
+.PP
+The owner of a foreign server can alter user mappings for that server for any user\&. Also, a user can alter a user mapping for their own user name if
+USAGE
+privilege on the server has been granted to the user\&.
+.SH "PARAMETERS"
+.PP
+\fIuser_name\fR
+.RS 4
+User name of the mapping\&.
+CURRENT_USER
+and
+USER
+match the name of the current user\&.
+PUBLIC
+is used to match all present and future user names in the system\&.
+.RE
+.PP
+\fIserver_name\fR
+.RS 4
+Server name of the user mapping\&.
+.RE
+.PP
+OPTIONS ( [ ADD | SET | DROP ] \fIoption\fR [\*(Aq\fIvalue\fR\*(Aq] [, \&.\&.\&. ] )
+.RS 4
+Change options for the user mapping\&. The new options override any previously specified options\&.
+ADD,
+SET, and
+DROP
+specify the action to be performed\&.
+ADD
+is assumed if no operation is explicitly specified\&. Option names must be unique; options are also validated by the server\*(Aqs foreign\-data wrapper\&.
+.RE
+.SH "EXAMPLES"
+.PP
+Change the password for user mapping
+bob, server
+foo:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ALTER USER MAPPING FOR bob SERVER foo OPTIONS (SET password \*(Aqpublic\*(Aq);
+.fi
+.if n \{\
+.RE
+.\}
+.SH "COMPATIBILITY"
+.PP
+\fBALTER USER MAPPING\fR
+conforms to ISO/IEC 9075\-9 (SQL/MED)\&. There is a subtle syntax issue: The standard omits the
+FOR
+key word\&. Since both
+CREATE USER MAPPING
+and
+DROP USER MAPPING
+use
+FOR
+in analogous positions, and IBM DB2 (being the other major SQL/MED implementation) also requires it for
+ALTER USER MAPPING, PostgreSQL diverges from the standard here in the interest of consistency and interoperability\&.
+.SH "SEE ALSO"
+CREATE USER MAPPING (\fBCREATE_USER_MAPPING\fR(7)), DROP USER MAPPING (\fBDROP_USER_MAPPING\fR(7))