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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 53.9. pg_group Columns
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Column Type
Description
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groname name (references pg_authid.rolname)
Name of the group
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grosysid oid (references pg_authid.oid)
ID of this group
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grolist oid[] (references pg_authid.oid)
An array containing the IDs of the roles in this group
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