First_value in Oracle olap based on non - time dimension

Question

Hi Experts,
I am trying to figure out to do first_value kind of calculation in Oracle OLAP.
Here is the requirement -
Fact table -
cust_id valid_flag balance
1 y 1000
1 y 1500
2 N 0
2 y 2000
2 y 2500
If valid_flag ='N' and balance =0, then set balance =0 for other cells for the customer. This needs to be done for all the dimensions.
Any pointer would be useful.
Regards, Neelesh

Answer 1

If the switch is really based on a dimension attribute (named particular_value), then it should be easy to create a derived measure.
CASE
  WHEN particular_dim.particular_value = 'N'
  THEN 0
  ELSE my_cube.balance
ENDBut perhaps what you mean is that there is another measure, IS_VALID say, and you need to get the value of IS_VALID for the current cust_id and the member named 'particular_value' of the particular_dim. In this case it would look something like this.
CASE
  WHEN my_cube.is_valid[particular_dim = 'particular_value'] = 'N'
  THEN 0
  ELSE my_cube.balance
ENDI expect that neither of the above expressions is right, but it should give you some pointers as to the kinds of tricks you can use.