Is it possible to set up a field during table creation to be a
"calculated" field, i.e. the value is calculated from other values.
For example:
Table A:
id integer primary key,
B_id integer references B(id),
cost integer default 0
Table B:
id integer primary key,
total integer -- select sum(cost) from A where B_id=id;
If not should I be looking at implementing this with a view or maybe a
trigger?
Thanks,
Jc
