Autoinkrement in PostgreSQL
ALTER TABLE temp ALTER COLUMN id
ADD GENERATED BY DEFAULT AS IDENTITY
JDBC
ALTER TABLE temp ALTER COLUMN id
ADD GENERATED BY DEFAULT AS IDENTITYCREATE SEQUENCE cateogry_id_seq;
ALTER TABLE category ALTER COLUMN category_id SET DEFAULT nextval('cateogry_id_seq');
By simply setting our id column as SERIAL with PRIMARY KEY attached, Postgres will handle all the complicated behind-the-scenes work and automatically increment our id column with a unique, primary key value for every INSERT .