I wonder the technology behind holding data in one field
as a detail table

let me explain ..
think of Outlook personel's.
when you want to add an e mail address to a person
You click add email button and an e-mail address adding a list.

here . I think only one feild in the databese
and holding data as a detail table structure.

How can I design this kind of Item and How can I store this kind of informtion to the database...

Thank you for your interests...