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PostgreSQL 9.4.23 Documentation
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48.58. pg_group

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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