Merlin Moncure <mmonc...@gmail.com> wrote:
 
> yeah, that's the correct way, but why does this work?
> select val from random() as val;
 
If you look at the PostgreSQL reference docs for the SELECT
statement, a from_item can be a SELECT statement in parentheses or a
function call (among other things).  It cannot be an arbitrary
expression containing operators (like ::).
 
-Kevin

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