SQL

add sequence postgres

CREATE SEQUENCE seq_tipo MINVALUE 1;
ALTER TABLE tipo 
ALTER codt SET DEFAULT nextval('seq_tipo');

/*insert into YOUR_COLUMN_NAME VALUES (nextval('seq_tipo'), 'value_2')*/

create sequence postgres

CREATE SEQUENCE mysequence
INCREMENT 5
START 100;

sequence postgresql

CREATE SEQUENCE seq_tipo MINVALUE 1;
ALTER TABLE tipo 
ALTER codt SET DEFAULT nextval('seq_tipo');

/*insert into YOUR_COLUMN_NAME VALUES (nextval('seq_tipo'), 'value_2')*/