Problem with sequence increment

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От Francisco Calderón
Тема Problem with sequence increment
Дата
Msg-id CAFVakMosc3T5WmhQqwDLQEkPRhChA9KoOUVQKGUR-3xwXBVOSg@mail.gmail.com
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Ответы Re: Problem with sequence increment
Re: Problem with sequence increment
Список pgsql-sql
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Hello,

I am having a situation with postgresql 8.3, i have two tables, ta and tb, with a relation "one tb has many ta" and... well, i will let the SQL talk for me ;)

-----------SQL-----------
CREATE TABLE tb
(
  id serial NOT NULL,
  descripcion character varying(200) NOT NULL,
  CONSTRAINT tb_pkey PRIMARY KEY (id)
)
WITH (OIDS=FALSE);
INSERT INTO tb (descripcion) values ('desc 1');
INSERT INTO tb (descripcion) values ('desc 2');
CREATE TABLE ta
(
  id serial NOT NULL,
  descripcion character varying(200),
  tb_id integer default null,
  CONSTRAINT ta_pkey PRIMARY KEY (id),
  CONSTRAINT ta_tb_id FOREIGN KEY (tb_id)
      REFERENCES tb (id) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION
)
WITH (OIDS=FALSE);

When i make an insert like this:

INSERT INTO ta (descripcion, tb_id) values ('prueba', 0);

we can expect this error:

ERROR:  insert or update on table "ta" violates foreign key constraint "ta_tb_id"
DETAIL:  Key (tb_id)=(0) is not present in table "tb".

and that is what i am getting but the unusual situation is the sequence "ta_id_seq" is incrementing every time i get the "violates foreign key constraint" error and i think this is not a good behavior, what do you think? 

Thanks in advance.
//
//   Francisco J. Calderón S.
//

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