Oracle - Problem creating trigger that updates another table

Question

I\'ve read the Oracle docs on creating triggers and am doing things exactly how it shows, however this just isn\'t working. My goal is to update the TPM_PROJECT table with the

Answer 1

As Justin Cave have suggested, you can calculate the minimum start date when you need it. It might help if you create an index on (projectid, startdate);

If you really have a lot of projects and training plans, another solution could be to create a MATERIALIZED VIEW that has all the data that you need:

CREATE MATERIALIZED VIEW my_view
... add refresh options here ...
AS
SELECT t.projectid,  MIN(t.start_date) AS min_start_date
FROM TPM_TRAININGPLAN t
GROUP BY t.projectid;

(sorry, don't have Oracle running, the above code is just for the reference)