pg_group

PostgreSQL 9.4.12 Documentation
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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 48-59. pg_group Columns

Name	Type	References	Description
`groname`	`name`	`pg_authid .rolname`	Name of the group
`grosysid`	`oid`	`pg_authid .oid`	ID of this group
`grolist`	`oid[]`	`pg_authid .oid`	An array containing the IDs of the roles in this group

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