I have a very large data set (400 variables). A lot of them are coded using numerical codes that relate to a string (not in the table). I have a data dictionary that tells me what these values relate to. I could create a lot of little tables that link to my master table for each coded variable, which is how I would normally do it for a small number of variables. Is this when I should be applying a mapping load? Would I require a map for every variable?