Thomas Guettler írta:
> Hi,
>
> how can you get N numbers (without holes) from a sequence?
>
> Thomas
>
>
# create sequence tmp_seq cache 1000;
CREATE SEQUENCE
>From the same client:
# select nextval('tmp_seq');
nextval
---------
1
(1 sor)
# select nextval('tmp_seq');
nextval
---------
2
(1 sor)
# select nextval('tmp_seq');
nextval
---------
3
(1 sor)
# select nextval('tmp_seq');
nextval
---------
4
(1 sor)
... (ad nauseum)
>From another psql client:
# select nextval('tmp_seq');
nextval
---------
1001
(1 sor)
# select nextval('tmp_seq');
nextval
---------
1002
(1 sor)
# select nextval('tmp_seq');
nextval
---------
1003
(1 sor)
# select nextval('tmp_seq');
nextval
---------
1004
(1 sor)
# select nextval('tmp_seq');
nextval
---------
1005
(1 sor)
...
You can get up to 1000 (or the number specified as CACHE N)
numbers in a series (without holes) in he same client at once,
you don't even need to be in the same transaction.
Best regards,
Zoltán Böszörményi
--
Bible has answers for everything. Proof:
"But let your communication be, Yea, yea; Nay, nay: for whatsoever is more
than these cometh of evil." (Matthew 5:37) - basics of digital technology.
"May your kingdom come" - superficial description of plate tectonics
----------------------------------
Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
http://www.postgresql.at/
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