On 10/16/2014 11:52 AM, David G Johnston wrote:
On Thu, Oct 16, 2014 at 11:44 AM, lup [via PostgreSQL] <[hidden email]
</user/SendEmail.jtp?type=node&node=5823296&i=0>>wrote:
I appreciate the vastness of bigserial but I think it starts at
1. Are negative numbers even allowed?
http://www.postgresql.org/docs/9.3/static/sql-createsequence.html
A DEFAULT sequence starts at one but it is able to generate any
biginteger value. Regardless, the value generated by the sequence
and the allowed values for the target column are distinct - which is
why a sequence attached to a normal integer will start throwing "value
out of bounds" errors before it runs out of values.
Therefore, by default if one is able to live with disallowing half of
the bigint range for auto-generation using the negative half of the
range for manual assignment is a quick-and-simple solution to the problem.
David J.
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at Nabble.com.
As proven by part 4 :)
postgres=# insert into t (id, name) values(-777, 'rjs');
INSERT 0 1
postgres=# select * from t;
id | name
------+------
1 | rjs
777 | rjs
-777 | rjs
(3 rows)
