postgres=# create table t1(id serial,ss text);
CREATE TABLE
postgres=# \d t1
                            Table "public.t1"
 Column |  Type   | Collation | Nullable |            Default             
--------+---------+-----------+----------+--------------------------------
 id     | integer |           | not null | nextval('t1_id_seq'::regclass)
 ss     | text    |           |          | 

postgres=# insert into t1(ss) (select s.id::text from generate_series(1,5) as s(id));
INSERT 0 5
postgres=# select max(id) from t1;
 max 
-----
   5
(1 row)

root@af4b4d5535c9:/# pg_dump -d postgres -U postgres -t t1 > t1.txt
root@af4b4d5535c9:/# psql -d db1 -U postgres -f t1.txt 
SET
SET
SET
SET
SET
 set_config 
------------
 
(1 row)

SET
SET
SET
SET
SET
SET
CREATE TABLE
ALTER TABLE
CREATE SEQUENCE
ALTER TABLE
ALTER SEQUENCE
ALTER TABLE
COPY 5
 setval 
--------
      5
(1 row)

root@af4b4d5535c9:/# psql -U postgres -d db1
psql (11.11 (Debian 11.11-1.pgdg90+1))
Type "help" for help.

db1=# select max(id) from t1;
 max 
-----
   5
(1 row)

db1=# insert into t1(ss) (select s.id::text from generate_series(1,5) as s(id));
INSERT 0 5
db1=# select max(id) from t1;
 max 
-----
  10
(1 row)

root@af4b4d5535c9:/# cat t1.txt 
--
-- PostgreSQL database dump
--

-- Dumped from database version 11.11 (Debian 11.11-1.pgdg90+1)
-- Dumped by pg_dump version 11.11 (Debian 11.11-1.pgdg90+1)

SET statement_timeout = 0;
SET lock_timeout = 0;
SET idle_in_transaction_session_timeout = 0;
SET client_encoding = 'UTF8';
SET standard_conforming_strings = on;
SELECT pg_catalog.set_config('search_path', '', false);
SET check_function_bodies = false;
SET xmloption = content;
SET client_min_messages = warning;
SET row_security = off;

SET default_tablespace = '';

SET default_with_oids = false;

--
-- Name: t1; Type: TABLE; Schema: public; Owner: postgres
--

CREATE TABLE public.t1 (
    id integer NOT NULL,
    ss text
);


ALTER TABLE public.t1 OWNER TO postgres;

--
-- Name: t1_id_seq; Type: SEQUENCE; Schema: public; Owner: postgres
--

CREATE SEQUENCE public.t1_id_seq
    AS integer
    START WITH 1
    INCREMENT BY 1
    NO MINVALUE
    NO MAXVALUE
    CACHE 1;


ALTER TABLE public.t1_id_seq OWNER TO postgres;

--
-- Name: t1_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: postgres
--

ALTER SEQUENCE public.t1_id_seq OWNED BY public.t1.id;


--
-- Name: t1 id; Type: DEFAULT; Schema: public; Owner: postgres
--

ALTER TABLE ONLY public.t1 ALTER COLUMN id SET DEFAULT nextval('public.t1_id_seq'::regclass);


--
-- Data for Name: t1; Type: TABLE DATA; Schema: public; Owner: postgres
--

COPY public.t1 (id, ss) FROM stdin;
1	1
2	2
3	3
4	4
5	5
\.


--
-- Name: t1_id_seq; Type: SEQUENCE SET; Schema: public; Owner: postgres
--

SELECT pg_catalog.setval('public.t1_id_seq', 5, true);  -------------------------  выставляет значение


--
-- PostgreSQL database dump complete
--