PostgreSQL 8.0.0 Documentation
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# 17.3. Groups

As in Unix, groups are a way of logically grouping users to ease management of privileges: privileges can be granted to, or revoked from, a group as a whole. To create a group, use the CREATE GROUP SQL command:

    CREATE GROUP name;

To add users to or remove users from an existing group, use ALTER GROUP:

    ALTER GROUP name ADD USER uname1, ... ;
    ALTER GROUP name DROP USER uname1, ... ;

To destroy a group, use DROP GROUP:

    DROP GROUP name;

This only drops the group, not its member users.

To determine the set of existing groups, examine the `pg_group` system catalog, for example

    SELECT groname FROM pg_group;

The psql program's `\dg` meta-command is also useful for listing the existing groups.

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