INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Fact Tables Design

Fact Tables Design

(OP)
I'm setting up a star schema dimensional model.
I have a fact field that is text and can be one of a set of values. Is it better to store it as a text value on the fact table or is it better to store it on the fact table as a 1 digit code and link it to a dimension table that holds the text value?.

The first method avoids a join.
The second makes the fact table smaller.

Consider a simple Order Status field that can be 'Active', 'Cancelled', 'Delivered'.  I could record the literal text in the fact table of 'Active', 'Cancelled' or 'Delivered'.  I could also store the code value of '1', '2' or '3' and link to a dimension table of 'Active', 'Cancelled' and 'Delivered'.

Is there a best practice for going one way or the other?


 

Dazed and confused
 

RE: Fact Tables Design

Its best practice to use the Integer Foreign Key in this case.     There are numerous reasons:  to save space in the fact table, to avoid having to update hundreds of millions of rows should you have to change the display name of the attribute, etc, etc.

RE: Fact Tables Design

(OP)
Gotcha.  Thanks dude.

Dazed and confused
 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!

Resources

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close