Oracle: Using subquery in a trigger

Question

How can I work around the Oracle\'s limitation of not allowing subqueries in triggers.

Here\'s an example trigger I\'m trying to create, but am unable to because I c

Answer 1

This trigger would do it:

CREATE OR REPLACE TRIGGER trigger_w_subquery
AFTER UPDATE OR INSERT ON project_archiving
FOR EACH ROW WHEN (old.archiving_status <> new.archiving_status
  AND new.archiving_status = 1
)
DECLARE
  l_offer projects.offer%TYPE;
BEGIN
  SELECT offer INTO l_offer 
  FROM projects 
  WHERE projnum = :new.projnum;

  IF l_offer IS NULL THEN
    INSERT INTO offer_log (offer, status, date)
    VALUES (null, 9, sysdate);
  END IF;
END;

I have assumed that the select from projects will always find a row; if not it will raise a NO_DATA_FOUND exception that you may need to handle.