%hash = ( "view0" => [qw/buffersize size value speed/],
	  "view1" => [qw/buffersize size value speed/],
	  "view2" => [qw/buffersize size value speed/],
	  "view3" => [qw/buffersize size value speed/]);

my $lastview;
my $output;
foreach $key (sort(keys %hash)){
    # Do this only the first time.
    if(not defined($lastview)){
	$lastview = $key;
	$output = "$key";
	next;
    }
    
    $output .= " full outer join $key on ";
    my $i;
    $array_elements_used = scalar(@{ $hash{$key} })-1;
    #loop through all of the elements except for the last
    for($i=0;$i<$array_elements_used;$i++){
	$output .= "$lastview.$hash{$lastview}[$i] = $key.$hash{$key}[$i]";
	# only add an "and" if this is not the last element used.
	$output .= " and " if ($i != ($array_elements_used-1));
    }
    $lastview = $key;
}

print $output, "\n";

=============
output:
view0 full outer join view1 on view0.buffersize = view1.buffersize and view0.size = view1.size and view0.value = view1.value full outer join view2 on view1.buffersize = view2.buffersize and view1.size = view2.size and view1.value = view2.value full outer join view3 on view2.buffersize = view3.buffersize and view2.size = view3.size and view2.value = view3.value