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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_user.sgml,v 1.18 2001/12/08 03:24:33 thomas Exp $
PostgreSQL documentation
-->
<refentry id="SQL-ALTERUSER">
<refmeta>
<refentrytitle id="sql-alteruser-title">
ALTER USER
</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
ALTER USER
</refname>
<refpurpose>
change a database user account
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>2001-07-10</date>
</refsynopsisdivinfo>
<synopsis>
ALTER USER <replaceable class="PARAMETER">username</replaceable> [ [ WITH ] <replaceable class="PARAMETER">option</replaceable> [ ... ] ]
where <replaceable class="PARAMETER">option</replaceable> can be:
[ ENCRYPTED | UNENCRYPTED ] PASSWORD '<replaceable class="PARAMETER">password</replaceable>'
| CREATEDB | NOCREATEDB
| CREATEUSER | NOCREATEUSER
| VALID UNTIL '<replaceable class="PARAMETER">abstime</replaceable>'
</synopsis>
<refsect2 id="R2-SQL-ALTERUSER-1">
<refsect2info>
<date>1998-09-08</date>
</refsect2info>
<title>
Inputs
</title>
<para>
<variablelist>
<varlistentry>
<term><replaceable class="PARAMETER">username</replaceable></term>
<listitem>
<para>
The name of the user whose details are to be altered.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">password</replaceable></term>
<listitem>
<para>
The new password to be used for this account.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>ENCRYPTED</term>
<term>UNENCRYPTED</term>
<listitem>
<para>
These keywords control whether the
password is stored encrypted in <literal>pg_shadow</>. (See
<xref linkend="SQL-CREATEUSER" endterm="SQL-CREATEUSER-title">
for more information about this choice.)
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>CREATEDB</term>
<term>NOCREATEDB</term>
<listitem>
<para>
These clauses define a user's ability to create databases.
If CREATEDB is specified, the user being defined will
be allowed to create his own databases. Using NOCREATEDB
will deny a user the ability to create databases.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>CREATEUSER</term>
<term>NOCREATEUSER</term>
<listitem>
<para>
These clauses determine whether a user will be permitted to
create new users himself. This option will also make the user
a superuser who can override all access restrictions.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">abstime</replaceable></term>
<listitem>
<para>
The date (and, optionally, the time)
at which this user's password is to expire.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-ALTERUSER-2">
<refsect2info>
<date>1998-09-08</date>
</refsect2info>
<title>
Outputs
</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>ALTER USER</computeroutput></term>
<listitem>
<para>
Message returned if the alteration was successful.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>
ERROR: ALTER USER: user "username" does not exist
</computeroutput></term>
<listitem>
<para>
Error message returned if the specified user is not known to
the database.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-ALTERUSER-1">
<refsect1info>
<date>1998-09-08</date>
</refsect1info>
<title>
Description
</title>
<para>
<command>ALTER USER</command> is used to change the attributes of a user's
<productname>PostgreSQL</productname> account. Attributes not mentioned
in the command retain their previous settings.
</para>
<para>
Only a database superuser
can change privileges and password expiration with this command. Ordinary
users can only change their own password.
</para>
<para>
<command>ALTER USER</command> cannot change a user's group memberships.
Use <xref linkend="SQL-ALTERGROUP" endterm="SQL-ALTERGROUP-title">
to do that.
</para>
<para>
Use <xref linkend="SQL-CREATEUSER" endterm="SQL-CREATEUSER-title">
to create a new user and <xref linkend="SQL-DROPUSER"
endterm="SQL-DROPUSER-title"> to remove a user.
</para>
</refsect1>
<refsect1 id="R1-SQL-ALTERUSER-2">
<title>
Usage
</title>
<para>
Change a user password:
<programlisting>
ALTER USER davide WITH PASSWORD 'hu8jmn3';
</programlisting>
Change a user's valid until date:
<programlisting>
ALTER USER manuel VALID UNTIL 'Jan 31 2030';
</programlisting>
Change a user's valid until date, specifying that his
authorization should expire at midday on 4th May 1998 using
the time zone which is one hour ahead of UTC:
<programlisting>
ALTER USER chris VALID UNTIL 'May 4 12:00:00 1998 +1';
</programlisting>
Give a user the ability to create other users and new databases:
<programlisting>
ALTER USER miriam CREATEUSER CREATEDB;
</programlisting>
</para>
</refsect1>
<refsect1 id="R1-SQL-ALTERUSER-3">
<title>
Compatibility
</title>
<refsect2 id="R2-SQL-ALTERUSER-4">
<refsect2info>
<date>1998-09-08</date>
</refsect2info>
<title>
SQL92
</title>
<para>
There is no <command>ALTER USER</command> statement in
<acronym>SQL92</acronym>.
The standard leaves
the definition of users to the implementation.
</para>
</refsect2>
</refsect1>
</refentry>
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