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Postgres documentation
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Description
</title>
<para>
- <command>ALTER GROUP</command> is used to change add users to a group or
- remove them from a group. Only database superusers can use this command.
+ <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>