Embedded For Loop With No Data

[rshepard at nospam.appl-ecosys.com]

  Haven't found an answer to my question in the books and other docs I have
available, so I am asking here.

  I have three lists of data retrieved from database tables. I want to cycle
through all three lists using nested FOR loops. What is the behavior if
there are no data in the list used in the middle loop?

  Example:

  for a in types:
      for b in subtypes:
          for c in details:
		do some processing

  Not every item in the 'types' list will have an associated 'subtype'. Does
the index ignore that loop and drop to the one nested beneath it?

Rich