If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

 
Go Back  dBforums > General > Database Concepts & Design > Functional dependency

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 03-29-11, 00:57
lavane_10 lavane_10 is offline
Registered User
 
Join Date: Mar 2011
Posts: 2
Functional dependency

Hi ,

I have some attributes of car , Regd_no, Make, Model, Year_of_production,First_registration_data,Fuel_ty pe,Capacity,Purchase_price and Original price.

i need to find the functional dependencies. I've tried some and would like to know your comments whether i'm correct.

Regd_no -> Year_of_production, First_registration_data, Purchase_price, Original_price, Fuel_type,Capacity,Make

Make -> Model

thanks.
Reply With Quote
  #2 (permalink)  
Old 04-18-11, 06:09
andrewst andrewst is offline
Moderator.
 
Join Date: Sep 2002
Location: UK
Posts: 5,171
Quote:
Make -> Model
That's not right: given the make of a car you do not necessarily know the model. The reverse may be true:
Code:
Model -> Make
But that won't be true either if 2 cars makers create a model with the same name.
__________________
Tony Andrews
http://tinyurl.com/tonyandrews
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On