A person who is authorized to use a specific database or specific objects in it is called a DB (database) user (or user, for short). You can provide authorization in two ways. You provide it explicitly by granting it directly to the person. You provide it implicitly by granting it directly to an aggregation of persons (called a DB group or group) to which the person belongs. All users belong to a default group called PUBLIC. If you want to define additional groups, you must use the underlying operating system to do so.
This overview covers:
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