Table/Procedure Design Question

I'm trying to design some lookup tables in our 9i DB to enable users to lookup the meaning of return codes from an application. The output of the application is a list of 0 to 30 return codes. We have a table, CODES, that has a field for each return code type. I am now trying to design lookup tables for each type of return code that will store the meaning of each value. The meaning is more important than the one character value, so most queries will be of the type “SELECT CODE_A.meaning FROM CODE_A WHERE code_value = (SELECT CODES.code_a FROM CODES WHERE…)” It works great for the 29 1-character codes, but it is the last code that is causing problems. The last return code is a string consisting of 0 to 10 2-character codes. There are 10 possible codes, and we have a lookup table, DPV_CODE, that has the 10 value/meaning pairs. The problem is that we would like to avoid having to parse this code string into the 2-digit codes in the SELECT query. Ideally, we would like to be able to query the DPV_CODE table with a the string of codes stored in the CODES table and have it return a concatenated string of the meanings of those codes. Is there a way to set a trigger or some other analogous procedure that will execute every time a SELECT is done on the DPV_CODE table? Is there another way to do this in the database? Or would it work better to do the parsing outside of the DB in the application code?

You could write a Function which returns a comma-delimited string. It could be called in your SELECT statement.
-cf

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