Data From Vendor Changes - forum topic by TDW

I have adopted previously written BTQ's from a 3rd party.
We receive a flat file (I believe) from one of our clients each month. The record size varies.
For example. Say there are a total of 11 colums in the flat file as follows.

• CustID
• Prod1
• Value1
• Prod2
• Value2
•     :
• Prod5
• Value5

Our client transmits the following (logical view).
CustID   Prod1   Value1   Prod2   Value2   Prod3   Value3   Prod4  Value4   Prod5  Value5
C123         0010     10         0035      5           0085      99        0245     3           0900    14
C456                                   0035     75           0085     42                                  0900     6
This is what we receive (physical view).
C123,0010,10,0035,5,0085,99,0245,3,0900,14
C456,0035,75,0085,42,0900,6
As you can see, the record size varies because the client does not (will not) use NULL values in their records. *Don't know the reason, but I suspect that because we are dealing hundreds of thousands of records (I only listed 2 customers with 5 products) this reduces their transmit time and costs.
The 3rd party who developed the BTQ uses the following code to populate the table.
Insert Into      tCustProd
CustomerID,
  (case        when Prod1N = 0020 then Value1V
      else ''  end )     as DressShoes,
  (case        when Prod1N = 0030 then Value1V 
               when Prod2N = 0030 then Value2V
      else ''  end )     as BollaHats ,
  (case       when Prod1N = 0040 then Value1V
                  when Prod2N = 0040 then Value2V
                  when Prod3N = 0040 then Value3V 
        Else ''  end  )        as SportsSocks ,
Not only are there hundreds of thousands of records, but there thousands of products. When the client adds a new product they do not use sequential Prod Numbers. For example, if they were to add were to 0010 0035, the above code would be changed to this (Changes are bolded).
Insert Into      tCustProd
CustomerID,
  (case        when Prod1N = 0010 then Value1V
      else ''  end )     as TankTops,
  (case        when Prod1N = 0020 then Value1V 
               when Prod2N = 0020 then Value2V
      else ''  end )     as DressShoes,
  (case       when Prod1N = 0030 then Value1V
                  when Prod2N = 0030 then Value2V
                  when Prod3N = 0030 then Value3V 
        Else ''  end  )        as BollaHats,
  (case       when Prod1N = 0035 then Value1V
                  when Prod2N = 0035 then Value2V
                  when Prod3N = 0035 then Value3V 
                  when Prod4N = 0035 then Value4V 
        Else ''  end  )        as CommandoBoots ,
  (case       when Prod1N = 0040 then Value1V
                  when Prod2N = 0040 then Value2V
                  when Prod3N = 0040 then Value3V 
                  when Prod4N = 0040 then Value4V
                  when Prod5N = 0040 then Value5V
        Else ''  end  )        as SportsSocks ,

Let me know if your require a deeper explanation. 
 
Thank and God Bless,
Genesius