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><H1
><A
NAME="SQL-ALTERUSERMAPPING"
></A
>ALTER USER MAPPING</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN54826"
></A
><H2
>Name</H2
>ALTER USER MAPPING -- change the definition of a user mapping</DIV
><A
NAME="AEN54829"
></A
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN54831"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER USER MAPPING FOR { <TT
CLASS="REPLACEABLE"
><I
>username</I
></TT
> | USER | CURRENT_USER | PUBLIC }
SERVER <TT
CLASS="REPLACEABLE"
><I
>servername</I
></TT
>
OPTIONS ( [ ADD | SET | DROP ] <TT
CLASS="REPLACEABLE"
><I
>option</I
></TT
> ['<TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>'] [, ... ] )</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54837"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>ALTER USER MAPPING</TT
> changes the definition of a
user mapping.
</P
><P
> 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
his own user name if <TT
CLASS="LITERAL"
>USAGE</TT
> privilege on the server has
been granted to the user.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54843"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>username</I
></TT
></DT
><DD
><P
> User name of the mapping. <TT
CLASS="LITERAL"
>CURRENT_USER</TT
>
and <TT
CLASS="LITERAL"
>USER</TT
> match the name of the current
user. <TT
CLASS="LITERAL"
>PUBLIC</TT
> is used to match all present and future
user names in the system.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>servername</I
></TT
></DT
><DD
><P
> Server name of the user mapping.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>OPTIONS ( [ ADD | SET | DROP ] <TT
CLASS="REPLACEABLE"
><I
>option</I
></TT
> ['<TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>'] [, ... ] )</TT
></DT
><DD
><P
> Change options for the user mapping. The new options override
any previously specified
options. <TT
CLASS="LITERAL"
>ADD</TT
>, <TT
CLASS="LITERAL"
>SET</TT
>, and <TT
CLASS="LITERAL"
>DROP</TT
>
specify the action to be performed. <TT
CLASS="LITERAL"
>ADD</TT
> is assumed
if no operation is explicitly specified. Option names must be
unique; options are also validated by the server's foreign-data
wrapper.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54870"
></A
><H2
>Examples</H2
><P
> Change the password for user mapping <TT
CLASS="LITERAL"
>bob</TT
>, server<TT
CLASS="LITERAL"
> foo</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER USER MAPPING FOR bob SERVER foo OPTIONS (user 'bob', password 'public');</PRE
><P>
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54876"
></A
><H2
>Compatibility</H2
><P
> <TT
CLASS="COMMAND"
>ALTER USER MAPPING</TT
> conforms to ISO/IEC 9075-9
(SQL/MED). There is a subtle syntax issue: The standard omits
the <TT
CLASS="LITERAL"
>FOR</TT
> key word. Since both <TT
CLASS="LITERAL"
>CREATE
USER MAPPING</TT
> and <TT
CLASS="LITERAL"
>DROP USER MAPPING</TT
> use
<TT
CLASS="LITERAL"
>FOR</TT
> in analogous positions, and IBM DB2 (being
the other major SQL/MED implementation) also requires it
for <TT
CLASS="LITERAL"
>ALTER USER MAPPING</TT
>, PostgreSQL diverges from
the standard here in the interest of consistency and
interoperability.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54885"
></A
><H2
>See Also</H2
><A
HREF="sql-createusermapping.html"
><I
>CREATE USER MAPPING</I
></A
>, <A
HREF="sql-dropusermapping.html"
><I
>DROP USER MAPPING</I
></A
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