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The view pg_group exists for
backwards compatibility: it emulates a catalog that existed in
PostgreSQL before version 8.1. It
shows the names and members of all roles that are marked as not
rolcanlogin, which is an approximation
to the set of roles that are being used as groups.
Table 47-58. pg_group
||Name of the group
||ID of this group
||An array containing the IDs of the roles in this group