Copy column contents

hai,
I have a database table with 8 fields and i want to add a new
column and copy the contents of one column to new column. if i try using
select and insert number of rows is duplicating and insertion is going to
end. how do i insert that contents to same row.

i am getting something like :

title | id | web | email | name
aaa | 11 | | |
bbb | 22 | | |
ccc | | | |
| | | |aaa|
| | | |bbb|
| | | |ccc|

but i want as

title | id | web | email | name
aaa | 11 | | |aaa|
bbb | 22 | | |bbb|
ccc | | | |ccc|

pls can anyone help me how do i go about this updation.

thanks
Arun