Litao Wu <litaowu@yahoo.com> writes:
> How about changing:
> CURRENT_TIMESTAMP - INTERVAL '10 minutes'
> to
> 'now'::timestamptz - INTERVAL '10 minutes'
> It seems to me that Postgres will treat it as
> a constant.
Yeah, that works too, though again it might burn you if used inside a
function or prepared statement. What you're doing here is to push the
freezing of the "now" value even further upstream, namely to initial
parsing of the command.
regards, tom lane