Обсуждение: Can't setval() a sequence to return the first value

Hi hackers.

Is it by design that you can't setval(seq, value) a sequence to a value 
which returns the first value:

See the sample below for better explanation:

hannu=# create sequence s;
CREATE SEQUENCE
hannu=# select nextval('s'); nextval
---------       1
(1 row)
hannu=# select setval('s',1); setval
--------      1
(1 row)
hannu=# select nextval('s'); nextval
---------       2
(1 row)
hannu=# select setval('s',0);
ERROR:  setval: value 0 is out of bounds for sequence "s" 
(1..9223372036854775807)

Should it not be possible to set sequence to one below the start value 
so that you can completely reset it ?

--------------------
Hannu

Hello

postgres=# select setval('xx', 1, false);setval
--------     1
(1 row)

postgres=# select nextval('xx');nextval
---------      1
(1 row)


Regards

Pavel

2013/1/3 Hannu Krosing <hannu@2ndquadrant.com>:
> Hi hackers.
>
> Is it by design that you can't setval(seq, value) a sequence to a value
> which returns the first value:
>
> See the sample below for better explanation:
>
> hannu=# create sequence s;
> CREATE SEQUENCE
> hannu=# select nextval('s');
>  nextval
> ---------
>        1
> (1 row)
> hannu=# select setval('s',1);
>  setval
> --------
>       1
> (1 row)
> hannu=# select nextval('s');
>  nextval
> ---------
>        2
> (1 row)
> hannu=# select setval('s',0);
> ERROR:  setval: value 0 is out of bounds for sequence "s"
> (1..9223372036854775807)
>
> Should it not be possible to set sequence to one below the start value so
> that you can completely reset it ?
>
> --------------------
> Hannu
>
>
>
>
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