|
|
Posted by bbcrock on 03/04/07 05:00
I have three tables with a relationship I've never worked with
before. Can anyone suggest/comment on the best way to create a third
normal form relationship between these tables?
The tables basically are:
TRAIN (TRAIN_ID and 15 columns about train specs, etc)
TRUCK (TRUCK_ID and 12 columns about truck specs, etc)
TRANSPORTATION_ITEM
This table has, among others, two columns, TRUCK_ID and TRAIN_ID. If
the truck column is used there can be no data in the train column and
vice versa.
This relationship seems denormalized to me, but I don't remember how
to normalize it. Does anyone know the correct name for this kind of
relationship?
thanks!
Navigation:
[Reply to this message]
|