Autoincrement, but omit existing values in the column

Question

I have a table:

create table DB.t1 (id  SERIAL,name varchar(255));

and insert some data:

insert into DB.t1 (name) values (\'nam         


        

Answer 1

@erwin-brandstetter Won't it be faster to first find the missing value and then simply setval('t1_id_seq'::regclass, ), thus removing excessive nextval calls? Also, if the question is how to make ids unique, assigning this code for default value won't solve the problem.

I'd suggest using unique constraint or primary key constraint and handle unique violation exception.