PostgreSQL在插入时使现有的主键自动递增

问题描述：

具有5列的现有表。

qid 这是PK，问题 geo_type 用户输入 活动

我需要能够插入到表中，每次新插入都会获得一个新的主键ID（这将是现有的最大ID +1）。

I need to be able to insert into the table with each new insert getting a new primary key id (which would be the max existing id +1).

所以我需要能够做到这一点

So i need to be able to do this

insert into sip_questions (question,geo_type,user_input,active) values('noury','octagon',TRUE,TRUE)

但这会给我这个错误

ERROR:  duplicate key value violates unique constraint "s_questions_pkey"
DETAIL:  Key (qid)=(1) already exists.

********** Error **********

ERROR: duplicate key value violates unique constraint "s_questions_pkey"
SQL state: 23505
Detail: Key (qid)=(1) already exists.

这是表格

CREATE TABLE public.sip_questions
(
  qid integer NOT NULL DEFAULT nextval('s_questions_qid_seq'::regclass),
  question character varying(200),
  geo_type character varying(10),
  user_input boolean,
  active boolean,
  CONSTRAINT s_questions_pkey PRIMARY KEY (qid)
)
WITH (
  OIDS=FALSE
);
ALTER TABLE public.sip_questions
  OWNER TO postgres;

我知道如何从像这样的新表中做到这一点

i know how to do this from a fresh table like this

ALTER TABLE table ADD COLUMN id SERIAL PRIMARY KEY;

每次插入都会增加PK，而无需我指定id列

and every insert will increment the PK without me having to specify the id column

答

新序列必须达到当前最大值。

The new sequence must be bumped to the current max value.

您可以重置它使用

SELECT setval('s_questions_qid_seq', max(id)) FROM sip_questions;

PostgreSQL在插入时使现有的主键自动递增

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