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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_group.sgml,v 1.9 2003/04/15 13:25:08 petere Exp $
PostgreSQL documentation
-->
<refentry id="SQL-ALTERGROUP">
<refmeta>
<refentrytitle id="SQL-ALTERGROUP-title">ALTER GROUP</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>ALTER GROUP</refname>
<refpurpose>add users to a group or remove users from a group</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
ALTER GROUP <replaceable class="PARAMETER">groupname</replaceable> ADD USER <replaceable class="PARAMETER">username</replaceable> [, ... ]
ALTER GROUP <replaceable class="PARAMETER">groupname</replaceable> DROP USER <replaceable class="PARAMETER">username</replaceable> [, ... ]
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>ALTER GROUP</command> is used to add or remove users from a
group. Only database superusers can use this command.
Adding a user to a group does not create the user. Similarly, removing
a user from a group does not drop the user itself.
</para>
<para>
Use <xref linkend="SQL-CREATEGROUP" endterm="SQL-CREATEGROUP-title">
to create a new group and <xref linkend="SQL-DROPGROUP"
endterm="SQL-DROPGROUP-title"> to remove a group.
</para>
</refsect1>
<refsect1>
<title>Parameter</title>
<variablelist>
<varlistentry>
<term><replaceable class="PARAMETER">groupname</replaceable></term>
<listitem>
<para>
The name of the group to modify.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">username</replaceable></term>
<listitem>
<para>
Users which are to be added or removed from the group. The users
must exist.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Diagnostics</title>
<variablelist>
<varlistentry>
<term><computeroutput>ALTER GROUP</computeroutput></term>
<listitem>
<para>
Message returned if the alteration was successful.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Add users to a group:
<programlisting>
ALTER GROUP staff ADD USER karl, john;
</programlisting>
Remove a user from a group:
<programlisting>
ALTER GROUP workers DROP USER beth;
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
There is no <command>ALTER GROUP</command> statement in the SQL
standard. The concept of roles is similar.
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
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