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Databases - Practical PostgreSQL
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Managing Groups

Groups serve to simplify the assignment of rights. Ordinary privileges must be granted to a single user, one at a time. This can be tedious if several users need to be assigned the same access to a variety of database objects.

Groups are created to avoid this problem. A group simply requires a name, and can be created empty (without users). Once created, users who are intended to share common access privileges are added into the group together, and are henceforth associated by their membership in that group. Rights on database objects are then granted to the group , rather than to each member of the group. For a system with many users and databases, groups make managing rights less of an administrative chore.

Note: Users may belong to any number of groups, or no groups at all.

Databases - Practical PostgreSQL
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