How do i keep my distinct values in this query?

Question

Hi, I have the following query:-
WITH data AS(SELECT  99.99 retail_value, 6545 sales_value, 7 tran_type, 2001 sale_date from dual union all
             SELECT  776.99 retail_value,774 sales_value,   8 tran_type, 2007 sale_date  from dual union all
             SELECT  929.99 retail_value, 56 sales_value, 8 tran_type, 2006 sale_date  from dual union all
             SELECT  44.99 retail_value, 35 sales_value,   8 tran_type, 2003 sale_date  from dual union all
             SELECT  776.99 retail_value,17 sales_value,   7 tran_type, 2008 sale_date  from dual union all
             SELECT  44.99 retail_value, 2 sales_value,   7 tran_type, 2007 sale_date  from dual),
     commercial_model AS(SELECT 1 com_id, 7 tran_type, 2001 valid_from, 2010 valid_to from dual union all
                         SELECT 1 com_id, 8 tran_type, 2001 valid_from, 2006 valid_to from dual union all
                         SELECT 2 com_id, 8 tran_type, 2001 valid_from, 2003 valid_to from dual union all
                         SELECT 2 com_id, 7 tran_type, 2001 valid_from, 2008 valid_to from dual)      
     SELECT a.*, b.* FROM
         data a,
           (select distinct tran_type from  commercial_model
             where com_id = nvl(NULL, com_id)
             ) b
     WHERE b.tran_type=a.tran_type Which works ok until i need to put a clause in to ensure that the sale_date is between the commercial model valid period i.e ( AND a.sal_date BETWEEN b.valid_from AND b.valid_to)
How can i incorporate this into my query, without losing the distinct tran_type in the inline view?
Many thanks

Answer 1

Not getting you clearly.
Where do you want to use this condition?
AND a.sal_date BETWEEN b.valid_from AND b.valid_toAnd, after using this condition what is your expected output?
Regards.
Satyaki De.