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.