Re: Update PK Violation

> Franklin Haut wrote:
>
> Hi all,
>
> i have a problem with one update sentence sql.
>
> example to produce:
>
> create table temp (num integer primary key, name varchar(20));
>
> insert into temp values (1, 'THE');
> insert into temp values (2, 'BOOK');
> insert into temp values (3, 'IS');
> insert into temp values (4, 'ON');
> insert into temp values (5, 'THE');
> insert into temp values (6, 'RED');
> insert into temp values (7, 'TABLE');
>

Couldn't figure out how to do it in one sentence, still it can be done with
a function:

CREATE OR REPLACE FUNCTION insert_value(p_num integer, p_name varchar(20))
RETURNS VOID AS
$$
declare
v_num integer;
BEGIN
FOR v_num in SELECT num FROM temp WHERE num >= p_num ORDER BY num DESC
LOOP
UPDATE temp SET num = num + 1 WHERE num = v_num;
END LOOP;
INSERT INTO temp VALUES (p_num, p_name);
END;
$$
LANGUAGE 'plpgsql' VOLATILE;

To run it:

sistema=# select insert_value(4, 'NOT');
insert_value
--------------

(1 row)

sistema=# select * from temp order by num;
num | name
-----+-------
1 | THE
2 | BOOK
3 | IS
4 | NOT
5 | ON
6 | THE
7 | RED
8 | TABLE
(8 rows)

Regards,
Fernando.