Обсуждение: Can't figure out how to use now() in default for tsrange column (PG 9.2)

I'm trying to set [now(), 2049-12-31 00:00:00) as the default for a
tsrange column (Postgres 9.2), but can't figure out how to do it. I'm
either getting syntax errors or now() is being evaluated, so that the
default becomes something like [2012-07-14 14:04:35, 2049-12-31
00:00:00), which is not what I want. Can anyone point me in the right
direction, please?

Chris Bartlett <c.bartlett@paradise.net.nz> writes:
> I'm trying to set [now(), 2049-12-31 00:00:00) as the default for a
> tsrange column (Postgres 9.2), but can't figure out how to do it. I'm
> either getting syntax errors or now() is being evaluated, so that the
> default becomes something like [2012-07-14 14:04:35, 2049-12-31
> 00:00:00), which is not what I want. Can anyone point me in the right
> direction, please?

I think you'd need to use the constructor function, ie

    default tsrange(now(), '2049-12-31 00:00:00')

BTW, that second value looks a whole lot like a poorly thought out
substitute for 'infinity' ...

            regards, tom lane