Permission on tables

Question:

I have a server X with Apache & PHP and a server Y with Postgres. I had the
usual "permission denied" error while trying to execute a query pg_exec in
a simple php page. I googled around a bit and found a page suggesting that
I do this:

     grant ALL on mytable to PUBLIC;

Q: Is this dangerous? What is encompassed by "ALL"? Read? Write? Drop? There
are some extremely clever hackers out there and I have already seen what
they can do, without leaving them any loopholes...

Steven



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