Hi,

Sergey's way is probably efficient enough, but on the asssumption that oodles
of records might have to be modified, I'ld prepare a replace-string
pseudo code

for every field in both tables and not in exclude list
   tcRep = iif(empty(tcRep), "" ,tcRep + ", ") + fieldname + " with iif(empty(target.fieldname) and !empty(source.fieldname), source.fieldname,  target.fieldname)"

and later call
replace all &tcRep for seek(target.PK, SourceAlias, SourceTag)

which makes just one call to makroexpansion for the whole table.
Since the whole processing of empty fields is handed off to the runtime,
it should be faster than checking in a vfp loop after positioning via code.

Also, it is immune against tables with different fcount() and so on -
but requires same field names and is a bit more work. depends on your data <g>.



my 0.02 EUR

thomas