it's not just a sequence like hexa because you have your own logical. can you have 001 or 000 can you have ZZZ can you have A1A after A19
so you have to write your logical first then convert to an algorithme then to code it. in talend you have to code in java. If you want to retrieve it from a db you have to code it into db language. the last solution is to fill a file with all possibilities (it's sometime quickest).