Quote Originally Posted by avrail View Post
no, you misunderstand me
primary key is Unique,
what if your sessionID inserted into the database as a primary key, and after a month someone else used the page, and he has a new SeesionID, can we grantee this new SessionID not used before ???
Actually in my case, I just need to save the data, perform very little calculation, email the result and the data is then useless and will never be fetched. This is why I don't care if SessionID is repeated, since I am comparing SessionID plus Today's date.

Thanks.