PostgreSQL, cấu hình lại bảng hiện có, thay đổi khóa chính thành type =serial

CREATE SEQUENCE kalksad1_kalk_id_seq;

ALTER TABLE kalksad1
        ALTER COLUMN kalk_id SET DEFAULT nextval('kalksad1_kalk_id_seq' )
        ;

ALTER SEQUENCE kalksad1_kalk_id_seq OWNED BY kalksad1.kalk_id;

WITH mx AS (SELECT max(kalk_id) AS mx FROM kalksad1)
SELECT setval( 'kalksad1_kalk_id_seq' , mx.mx)
FROM mx
        ;

   -- Test it ...
INSERT INTO kalksad1(brkalk, brred, description) VALUES (42, 666, 'Tralala' );
SELECT * FROM kalksad1;

Kết quả:

NOTICE:  table "kalksad1" does not exist, skipping
DROP TABLE
CREATE TABLE
INSERT 0 12
CREATE SEQUENCE
ALTER TABLE
ALTER SEQUENCE
 setval 
--------
     47
(1 row)

INSERT 0 1
 kalk_id | brkalk | brred |        description        
---------+--------+-------+---------------------------
      12 |      2 |     5 | text index 12 doc 2 row 5
      26 |      2 |     1 | text index 26 doc 2 row 1
      30 |      2 |     2 | text index 30 doc 2 row 2
      32 |      4 |     1 | text index 32 doc 4 row 1
      36 |      1 |     1 | text index 36 doc 1 row 1
      37 |      1 |     2 | text index 37 doc 1 row 2
      38 |      5 |     1 | text index 38 doc 5 row 1
      39 |      5 |     2 | text index 39 doc 5 row 2
      42 |      2 |     3 | text index 42 doc 2 row 3
      43 |      2 |     4 | text index 43 doc 2 row 4
      46 |      3 |     1 | text index 46 doc 3 row 1
      47 |      3 |     2 | text index 47 doc 3 row 2
      48 |     42 |   666 | Tralala
(13 rows)