my $sth_C = $dbh->prepare(
    "select * from result_storage_keep 
     where aggregated_area like ?")
     or die "Couldn't prepare query: " . $dbh->errstr;

foreach my $area (@Geo_areas) {
    next unless $area;

    $sth_C->execute($area) 
        or die "Couldn't execute query: " . $sth_C->errstr;

    while (my @row = $sth_C->fetchrow_array) {
        print OUTPUT_FILE 
            join("\t", map {$_ ? $_ : "''"} @row),
            "\n";
    }       
}