Mapping issue in Data Services

Hello, Experts!
I'm just starting to learn DS. Can anybody help me with the following question:
I have a table, for example:
id Curr value
1 USD 100
2 JPY 200
3 USD 300
4 JPY 400
5 EUR 500
And the issue is to map it so as to check the condition of belonging "Curr" to the sets (JPY, USD) and (EUR, USD), and the following table would be obtained:
id Code Curr Value
1 AAA USD 100
2 AAA JPY 200
3 AAA USD 300
4 AAA JPY 400
4 BBB   USD 100
5 BBB   USD 300
6 BBB   EUR 500
The main difficulty lies in putting the checking parameters into an additional table, so user can vary the members and quantity of combinations
The mapping should exist in Query transform
BR, Alexey
Edited by: Alexey Veselov on Dec 12, 2011 2:20 PM

Hi Alexey,
Could you elaborate on the requirement? It is still not clear to me what you want to achieve.
What I do understand is that the users should be able to make adjustments to the mapping/lookup entries.
If that is the case, what exactly is going to be maintained in the 'additional table' and how are you suggesting end users are going to maintain this?
Ideally, your query transformation should not change when parameter values change, so you have to think about what logic you put where.
My suggestion would be to use a file or a table which can be maintained by users. In your query transformation you can then use the lookup or lookup_ext function.
Especially with lookup_ext you can make it as complicated as you want. The function is well documented but if you need help then just reply and explain in a bit more detail what you're trying to do.
If you do think the 'hard-coded' option would suit you better, you can look into the 'decoce' function. Again, it is well documented in the technical manual.
Jan.

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