Did you insert a row into table2? What happens if there is no row in table
1 where id = code (of the newly inserted row in table2). Seems to me you
many need to consider expanding increment_value() to check table1 to see if
code exists. If not insert a new value, else update.
-----Original Message-----
From: Ramiro Arenas Ramirez [SMTP:[EMAIL PROTECTED]]
Sent: Thursday, February 01, 2001 2:48 PM
To: [EMAIL PROTECTED]
Subject: how to create this trigger?
I need to create a trigger that increment a value in a column
of table1 where a row is inserted in table 2
I have tried whit this but it just does nothing.
CREATE FUNCTION increment_value () RETURNS opaque AS
'DECLARE
code int4;
BEGIN
code := new.code;
UPDATE table1
SET value = value + 1
WHERE id = code;
RETURN NEW;
END;' LANGUAGE 'plpgsql';
CREATE TRIGGER insert_on_table2 BEFORE INSERT ON table2
FOR EACH ROW EXECUTE PROCEDURE increment_value();
Can you help me?
