Internal table

Hi frnds,

please clear my doubts in internal table... i having int table pernr email name .

first i am filling the table with the pernr and email.

and i need to select the name from some other table and want to fill the column 'name' in the internal table,

if am selecting it the table is filled with the name but the email and the pernr is deleted how to retain it as it is and also the name also should be there adjacent to the correct pernr.