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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
Table 44-47. pg_group
||Name of the group
||ID of this group
||An array containing the IDs of the roles in this