Trigger Computed column refresh

[Former Member]

I have 2 tables (parent and child). On parent, I have a computed column that is sum of ColA in Child table by parent id.

My problem is: how to refresh computed column value when I have a insert/delete on child table? I don't need to process updates since my program doesn't allows it.

[VolkerBarth]

Is this really a computed column, i.e. declared with COMPUTE(...)?

AFAIK, those should only be used with constant values and deterministic functions.

I would generally recommend to omit (or "delay") the computation completely by using a view instead of a computed column, say by something like

create view V_ParentWithSum as
select parent.*, sum(child.colA) as SummedChild
from parent key join child

If this does not need your requirements, I would use a trigger on child to update the parent. But then I would not declare the column as a computed column, as changing computed columns via triggers of other tables seems dangerous (and looks suspicious as well IMHO).