In article <47453419.1050901@xxxxxxxxxxxx>,
Richard Huxton <dev@xxxxxxxxxxxx> writes:
> Kathy Lo wrote:
>> On 11/21/07, Richard Huxton <dev@xxxxxxxxxxxx> wrote:
>>> You probably shouldn't attach any meaning to the numbers from a sequence
>>> - they're just guaranteed to be unique, nothing else.
> What you say here contradicts the following.
>> Actually, the sequence is formed by 4-digit of year and 6-digit of
>> sequence.
> So you *are* attaching significance to the number (by adding the
> current year to the front of it).
> Don't block users - have multiple sequences. If you define
> my_seq_2007, my_seq_2008, my_seq_2009 etc and then wrap access to them
> in a function you can EXTRACT() the year from the CURRENT_DATE and use
> that to form your per-year unique value.
Since sequences don't guarantee consecutivity anyway, why not just use
one sequence and prepend the year, e.g. by a view?
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