Oracle triggers - problem with mutating tables

Question

My tables:

TableA (id number, state number)
TableB (id number, tableAId number, state number)
TableC (id number, tableBId number, state number)

Answer 1

Can you refactor the solution to include views to perform the calculation ?

CREATE VIEW a_view AS
SELECT a.Id, min(b.State) State FROM tableA,tableB
WHERE a.Id=b.tableAId
GROUP BY a.Id;

I agree that stored procs (as suggested here in other posts) are also a good candidate - but note that the view will automatically be kept up-to-date, whereas I believe you would have to schedule running stored-procs to keep the data 'in-sync': which may be fine - it depends on your requirements.

I guess another option is to create some functions to do the calculation, but personally I would opt for the view-approach (all things being equal).