On Mon, Apr 09, 2001 at 05:57:45PM +0200, Peter Eisentraut wrote:
> Cedar Cox writes:
>
> > When would one want to use cast()? What is the difference between cast
> > and :: ? After a quick look in the documentation I couldn't find
> > anything..
>
> cast() is SQL, :: is traditional Postgres. :: may go away in the distant
> future to make room for the SQL feature that is supposed to use ::. (It
> escapes me at the moment what that was.)
FYI, I can't find an occurance of '::' that's not part of '::=' in either
SQL1992.txt or the ansi-iso-[sql]-1999.txt files I've got.
But Peter's answer's still correct: CAST( <value> AS <type> ) is SQL
standard, '::' is not.
Ross
