Can I change the database structure (adding fields in the tables) on the fly?

We plan to develop a base database right now. However, most likely, the requirements will be changed from time to time. The main changes will be extra fields.

I think it is possible to do so.
What is the best way to implement this?

Thanks a lot for your help.
Please forward the reply to my account as well.

Yours Truly,

Paul

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Paul C. M. Wong       [www.ece.ubc.ca/~paulw]       phone: (604)822-5084
Master Student of Applied Science                   fax:   (604)822-5949
Dept. of Electrical and Computer Engineering        office:    CICSR 379
The University of British Columbia               e-mail:paulw_at_ece.ubc.ca