How to make the entry unique

Question

Hi guys,
I have a table of people with the following fields:
firstName
lastName
DOB
email
address
group
as you can see, nothing makes an entry unique. so say I would like to get some info about John Smith, I might found more than one entry for John Smith.
Question: any idea how to make an entry unique? hashing???
I'm using mySQL.
Thanks for any help
Peter

Answer 1

You need to assign a primary key to your table ( a field that can't be reproduced). You can add a social security field and make it your primary key.
Your mysql line might look like this (for a table with 2 fields):
mysql> CREATE TABLE Info( Name varchar(64),
                                                     SSN varchar(64) primary key);