Copying An Ntext Cell From One Cell Into Another (destination Row Already Exists)

Hi!

What I'd like to do is:

UPDATE table1
SET
A_TEXT_COLUMN = (SELECT another_text_column
FROM table2
WHERE table2_id = @precomputed_id_1)
WHERE table1_ID = @precomputed_id_2

Since the cells are text, this does not work. Since the cell to be updated is in an already exitant row, it's not possible to simply use insert.

I'd like to do something like (PSEUDOcode):

WRITETEXT(table1.A_TEXT_COLUMN, READTEXT(@textptr_initialised_to_point_at_target_c ell))

But the *actual* synatx of WRITETEXT and READTEXT seem totally inappropriate for any such trick...

Any hints or pointers HUGELY appreciated... THANX