"Emilio Platzer" <[EMAIL PROTECTED]> wrote
in message
news:[EMAIL PROTECTED]
> I want to UPDATE a field of one table with data of rows of the same
> table.
>
> For example to calculate the depth of a node in a tree
>
> update nodes as s set s.depth=
> (select f.depth+1
> from nodes as f
> where f.id=s.father_id)
> where s.depth is null;
You can't give an alias to the table you are updating, but you can use
the same table (with an alias) in subselect. Just make it
update nodes set s.depth=
(select f.depth+1
from nodes as f
where f.id = father_id)
where depth is null;
Igor Tandetnik
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