triggers - SQL - Default Value of other columns/fields -

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i have access db contains following column/fields: [id], [itemcode], [imagecode].

the filecode "computed" expression of:

[itemcode] & "img" & [id] & ".jpg"

so if [id] , [itemcode] "4" , "item008a" (respectively) [imagecode] be: "item008aimg4.jpg".

however, migrating sql, , while rebuilding table, found can't column's default value or computed formula.

i've read triggers best resolve, have written triggers affect other tables , not (if possible?).

is there more direct? if not, trigger like?

any appreciated. thanks.

you can add computed column 

alter  table tablea add    imagecode     cast(itemcode varchar(10)) + 'img' + cast( id varchar(10)) + '.jpg'

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