Re: currval, lastval, nextvar?

"A. Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com> writes:
> Yes. You don't need call nextval.

Well, you do, but the point is that the default expression for a
serial column includes the nextval() call. Look at the table with
\d, eg

postgres=# create table t1(id serial primary key);
NOTICE: CREATE TABLE will create implicit sequence "t1_id_seq" for serial column "t1.id"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "t1_pkey" for table "t1"
CREATE TABLE
postgres=# \d t1
Table "public.t1"
Column | Type | Modifiers
--------+---------+-------------------------------------------------
id | integer | not null default nextval('t1_id_seq'::regclass)
Indexes:
"t1_pkey" PRIMARY KEY, btree (id)

postgres=#

So if you do an insert that doesn't provide a value for that column,
the nextval is done implicitly.

regards, tom lane