Database model question

[ding...@gmail.com]

Hi everyone;

I want to write a report about database model, and i
plan to write 3 models which are Network Model,Hierarchical Model, and
relational model.

Since I only used relational database be4 which are
mysql and MS access. I am not quite familar wi the other 2. Can
anybody
give me a suggestion about what areas I can write for those two,
something like mapping,application, structure..........something like
that.and anything that I can compare..?

really appreciate!!!! and any reference and
recourse i can use,plz give me a hand.~~~

Thx!!!!!!!!!!!!!!!!!!!

[jefftyzzer]

I would start with this paper:

http://tomandmaria.com/tom/Writing/VeritableBucketOfFactsSIGMOD.pdf

The canonical hierarchical data management system is IBMs IMS, while
IDMS is the one most associated with the network model. Along with the
reference above, I'd also check out Chapter 6 of _From Airline
Reservations to Sonic the Hedgehog: A History of the Software
Industry_ (http://mitpress.mit.edu/catalog/item/default.asp?
ttype=2&tid=9539)

Finally, and perhaps most importantly (as far as this group is
concerned ;-), check out Codd's original papers (references 32 and 33
of the "Veritable Bucket" paper) for the impetus behind the relational
model, i.e., what were the weaknesses in the existing approaches that
Codd was seeking to remedy?

Good luck,

--Jeff