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  2. MIDRANGE-L
  3. August 2005

SQL Query Scalar Function Versus Second Table

Hi All,

Scenario:
I have 1. Physical File with Part numbers ( that have one or more of the dash character embedded in them ) 
   2. Logical file with the part Number as the only key
3. A requirement to validate these part numbers when the users enter them with misplaced dashes. The requirement from the user is "remove all dashes in the entered part number and check if that exists as a valid part number. 4. I think that there are more transactions that know the real part number than there are that have misplaced dashes. ( But I cannot be sure ) 
   5. I am on a V5R3 Box.

Possible solutions:
1. Select * from part where replace(partNumber, '-', '' ) = partNumber.replace( '-', '' ); In light of the recent discussion about date field equalities this might be a bad solution.
2. Create a post update/insert/delete trigger that will write another table with the partNumber and "partNumber without dashes" and create a logical on the "partNumber without dashes", check against that 

Question:

   1. Given the scenario which is the best approach that I can take ?
   2. Is there a general pattern to answer questions of this nature ?

Thanks in advance for your time.
Pillai

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