Tal Walter <t...@sqreamtech.com> writes:
>    - Why in the roles system, user are actually roles with login attribute
>    and not a separate entity.

Groups and users used to be separate concepts, actually, a long time ago.
We got rid of that because it was a PITA; in particular, grants to groups
had to be represented separately from grants to individual users.  Looking
at the git history, that happened in mid-2005, so you might trawl the
pgsql-hackers archives from around that time for discussion.

>    - Why to read from a table, both a usage permission on the schema and a
>    read access permission on the table is needed?

Because the SQL standard says so.  You might want to get a copy.  While
the "official" releases cost lots o' money, draft versions are freely
available on the net, and are generally close enough.

                        regards, tom lane

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