This is a very broad question, so giving a specific answer is difficult 
to say the least, but since no one else has responded I will provide at 
least this much....

You are going to want to be looking at using a "hash of hashes" 
essentially you create a hash where each key is the email address (which 
you will be looking up on) and the value associated with that key is 
itself a hash.

Here is one place to start:
http://www.wdvl.com/Authoring/Languages/Perl/PerlfortheWeb/hash_of_hashes.html

Or there are examples of these types of structures in the Camel, 
Advanced Perl Programming, and possibly the other perl related O'Reilly 
books.

Good luck.....

http://danconia.org



Anthony E. wrote:
> How would I store (and access) a table of
> information...assuming there is a unique key
> 'email'...ie -
> 
> These are the column names:
> email firstName lastName phone address1
> 
> "[EMAIL PROTECTED]" "Joe Blow" "415-555-5555" "123
> Mayberry"
> 
> "[EMAIL PROTECTED]"  "John Doe" "619-555-5551" "456 Happy
> Ln."
> 
> etc...etc...
> (also some of the fields will be null from time to
> time).
> 
> 
> 
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