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><H1
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>ALTER USER MAPPING</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN66086"
></A
><H2
>Name</H2
>ALTER USER MAPPING&nbsp;--&nbsp;change the definition of a user mapping</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN66091"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER USER MAPPING FOR { <TT
CLASS="REPLACEABLE"
><I
>user_name</I
></TT
> | USER | CURRENT_USER | PUBLIC }
    SERVER <TT
CLASS="REPLACEABLE"
><I
>server_name</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="AEN66097"
></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="AEN66103"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>user_name</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
>server_name</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="AEN66130"
></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 (SET password 'public');</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN66136"
></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="AEN66145"
></A
><H2
>See Also</H2
><A
HREF="sql-createusermapping.html"
>CREATE USER MAPPING</A
>, <A
HREF="sql-dropusermapping.html"
>DROP USER MAPPING</A
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