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I am a bit confused by the role attribute LOGIN | NONLOGIN, where postgres docs says:

These clauses determine whether a role is allowed to log in; that is, whether the role can be given as the initial session authorization name during client connection. A role having the LOGIN attribute can be thought of as a user. Roles without this attribute are useful for managing database privileges, but are not users in the usual sense of the word. If not specified, NONLOGIN is the default, except when CREATE ROLE is invoked through its alternative spelling CREATE USER.

What is a possible restriction with NONLOGIN? Why would people want a role with NONLOGIN in the first place?

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The clause is NOLOGIN, not NONLOGIN. (I suggest copy/paste for quotes.)

The clause is for "group" roles, which used to actually be GROUP before Postgres 8.1 - which is still supported. See CREATE GROUP in the manual. Related:

Group roles are very useful to bundle privileges and then grant / revoke the whole package to LOGIN roles. See:

Or to act as demons within the database:

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