Don't remember how to update a table :-(

I don't recall how to update a field in a table with values from another
table based on a relationship.

Table 'one' has fields 'f1','f2','f3'
Table 'two' has fields 'f1','f2','f3'

I want to update field 'f3' in table 'one' with the values of 'f3' from
table 'two' based on relationship (one.f1=two.f1) and (one.f2=two.f2)

I thought that it should work :

update one set one.f3=two.f3 from one,two where (one.f1=two.f1) and
(one.f2=two.f2);

But it doesn't work!

Am I doing something wrong ?

Please me cc: directly to teo(at)flex(dot)ro
--
Constantin Teodorescu
FLEX Consulting Braila, ROMANIA