Hi Cindy,
I'd also recommend you take a look at :
http://techdocs.postgresql.org/college/001_sequences/
As this is a CBT which explains things pretty well.
:-)
Regards and best wishes,
Justin Clift
Cindy wrote:
>
> OK, next question. I'm trying to use nextval/currval and I'm getting
> this:
>
> search_info=# select currval('state_vectors_id_seq');
> ERROR: state_vectors_id_seq.currval is not yet defined in this session
> search_info=# select id from state_vectors;
> id
> ----
> 1
> (1 row)
>
> shouldn't the first select have returned 1? The state_vectors_id_seq
> is the sequence created by declaring id SERIAL in the table
> state_vectors, and I've done one INSERT INTO state_vectors VALUES
> (nextval('state_vectors_id_seq'), ... ); which worked fine and is
> where the 1 comes from. (I'm interested in finding out the value used
> for the most recent insert, and currval seemed like a pretty painless
> way of doing so.)
>
> (I'm basing this on 4.15.2 of the postgresql faq kindly supplied
> earlier.)
>
> --CIndy
>
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