PG Doc comments form <noreply(at)postgresql(dot)org> writes:
> I think there's a mistake under "and table_constraint is:" where the
> different constraints are listed.
> Here: https://www.postgresql.org/docs/current/sql-altertable.html
> The definition here allows for CHECK constraints to be deferrable when they
> are not.
It's not a mistake, we are simply not trying to make the syntax diagram
reflect that particular implementation restriction. I doubt that making
it do so would be an improvement: we'd have to have two kinds of
column_constraint in the diagram.
regards, tom lane