I'm preparing a sub which generates SQL INSERT statements. The parameters passed to the sub are a scalar, and a hash, and looks like this : 
sub update_table{
    my $l_tablename = shift;
    my %l_fields = shift;
    my $l_fieldnames;
    my $l_fieldvalues;
    my $l_prepare;
    my $l_fieldnames = join ",", keys %l_fields;
    my $l_fieldvalues = join ",", values %l_fields;
    $l_prepare = "INSERT $l_tablename (" . $l_fieldnames . ")\n VALUES
+ (" . $l_fieldvalues . ")";
}

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My concern is over the keys and values. I know it's unreliable to expect a hash's contents to come out in a consistent order after manipulating it; I want to know if keys and values will ever present the same problem. That is to say, given the following 
%x = (a =>1,
      b =>2,
      c =>3,
      d =>4);

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if keys %x yields (b,d,c,a), I expect values %x to yield (2,4,3,1). Some testing confirms this, but I'd like to know if there are any special exceptions, or if I've just been lucky in my experiences.

In reply to How hashes present keys and values. by boo_radley

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