>because
>i dont know where is record position in that table/cursor
>but i want to scan from top of file

SCAN will go to the top of the table automatically!

go top && is not required
scan while not eof() && "while not eof()" is not required
  do something
endscan

You only need:

scan
  do something
endscan

Some programmers use "do while not eof()", which is a waste of the programmer's time.

If you use a SCAN, the following are implicit:

go top (before the SCAN) - the SCAN will start at the beginning anyway.

while not eof() - SCAN will stop at the last record anyway

SKIP - SCAN will automatically go to the next record. (An additional SKIP would process only one out of every two records.)

Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)